ESSEX ENGINEERING CORPORATION

WATER/WASTEWATER TREATMENT CONTROL SYSTEMS AND SUBSYSTEMS 2000 SERIES CONTROL SYSTEMS: 2000 series are for surface mounting inside a control cabinet Model 2024 Electronic Alternator Duplex (two pump) pump control 2400 SERIES CONTROL SYSTEMS: 2400 series units are for front panel (semi-flush) mounting Model 2402 Pump Status Module Status indication and control of pumps Model 2403 Valve Status Module Status indication and control of 2-position valves Model 2404 Annunciator Provides up to 4 points of alarm annunciation Model 2406 Sequencer Manual sequence selection of process control contacts Model 2407 Alternator Module Duplex, triplex or quadraplex pump control alternator Model 2410 Pump Controller Converts current signal to 4 on-off contact closures plus high, low and signal loss alarms Model 2411 Duplex Pump Controller Converts current signal to 2 on-off contact closures plus high, low and signal loss alarms and alternation Model 2415 Manual Loading Station Auto/Manual loading station with digital indication of analog signal Model 2416 Manual Loading Station Auto/Manual loading station with digital indication of analog signal and output Model 2420 Ratio Station Module Provides ease of use and flexibility in chemical feed systems 3000 SERIES EQUIPMENT: Includes power supplies, loop power supplies, lightning arrestors, remote relays, etc. Model 3800 Line Protection Unit Surge protection for 4-20mADC signal lines Model 3804 Relay Interface Module (4) SPDT 24 VDC relays and terminal blocks mounted on a compact base for track mounting Model 3805 Relay Interface Module (2) DPDT 24 VDC relays and terminal blocks mounted on a compact base for track mounting Model 3824 Relay Interface Module (2) SPDT 24 VDC relays and terminal blocks mounted on a compact base for track mounting Model 3905 Duplex Alternator A reliable, modular unit designed specifically for use with the Model 2410 Controller to provide alternation Model 3907 Loop Power Supply A reliable, modular unit designed specifically for providing loop power for instrument systems

COMPLETE CONTROL SYSTEMS designs and builds complete control systems for water and wastewater treatment and other industries. We would be pleased to quote on any requirements you may have of this nature. Registered professional engineering assistance is available if needed. 2008 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. INDEX-7000, Rev. 1

MODEL 2024 ELECTRONIC ALTERNATOR.... Provides a reliable, flexible system of starting, stopping, sequencing of pumps, blowers, & other devices. FEATURES Modular Construction... Control/Display Circuit board is easily replaced Alarm Silence circuitry for Audible Alarms All functions provided with momentary test switches Built in time delay prevents simultaneous lead/lag unit operation on power-up Lead/lag unit preference easily switch selected Level signals are indicated by L.E.D. lamps DESCRIPTION The Essex Engineering Model 2024 Electronic Alternator is a versatile, reliable system for use in starting, stopping and sequencing pumps, blowers, or other equipment to be cycled. For instance, as the level in a basin or other container changes, the level sensing switches monitor these changes and transmit a signal to the electronic alternator. The alternator, upon receiving the proper signal, will either start or stop the pumps in proper sequence. There are separate turn-on and turn-off points for control, and for high level alarm. Isolated output contacts are provided for pump operation and alarms. The standard unit will operate from a 4 or 5 level point system, and has lock-in or non-lock-in sequence for lag level which can be field modified. High level alarm point can be field set for lock-in, manual reset, or automatic reset. Relay K4 can follow K3 for DPDT switch operation, or be used as an audible device relay, dropping out when Alarm Silence pushbutton is added. The electronic alternator also has a six second time delay to prevent the lag pump from starting simultaneously with the lead pump after a power failure, thus protecting an emergency generator from high inrush starting current requirements.

MODEL 2024 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 10W Max. 12 VDC + 10% 450 madc CONTACT INPUTS 12 VDC @ 10 ma Max. CONTACT OUTPUTS 10A resistive @ 240 VAC TIME DELAYS Approximately 6 seconds ELECTRICAL CONNECTIONS - OVERALL DIMENSIONS 2004 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2024-7000, Rev. 2

MODEL 2402 PUMP STATUS MODULE.... Provides status indication and control of pumps, blowers and other types of motors. FEATURES Bright, long life LED'S give reliable indication of status and monitoring of control functions. HAND-OFF-AUTOMATIC selector switches provide automatic and manual override capability. Provides visual indication of actual motor start or stop. 120VAC/24VD/12VDC power source. Auxiliary output contacts on all front panel switches provide remote monitoring or special "system" interlocks. DESCRIPTION The Essex 2402 Pump Status Module operates in the following manner: Assuming the pump is in the off condition, the green OFF indicator is lit. If the HAND-OFF-AUTO pushbuttons are indexed to AUTO, and an external contact closure occurs which enables the pump or motor to start, an amber CALL indicator will light. Once the pump starts, an auxiliary contact on the motor starter, pressure switch, flow switch, etc. sends a "report back" signal to the 2402 causing the red RUN light to come on and the green OFF indicator and amber CALL indicator to go out. If the pump fails to start, or fails to stop within a 0.2 to 60 second field adjustable time, the red FAIL lamp will flash, indicating trouble and an optional external horn will sound. Depressing the ALM/ SIL button will silence the horn and cause the FAIL indicator to light steadily. If the HAND-OFF-AUTO pushbuttons are indexed to HAND, an amber CALL indicator will light and the unit will operate as described above. Auxiliary contacts are included on the HAND-OFF- AUTO pushbuttons to provide remote monitoring of these switches, or to provide the capability for external interlocking. Field selectable power up or control input timing is standard. This provides staggered starting of unit after a power failure or delayed starting each time the unit is activated. All indicators light for approximately 1 second on power up or can be checked at any time using ALM/SIL button. All of the switches and indicators on the instrument face are sealed for ease of cleaning and the prevention of switch contamination from grease, dirt, etc.. Units are provided with a custom engraved label identifying the use of the Pump Status Module.

ELECTRICAL CONNECTIONS MODEL 2402 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. CONTROL INPUTS Contact closure or NPN transistor; 10 madc max. @ 24 VDC CONTROL OUTPUTS NPN solid state output; 50 VDC @ 60 madc max. per point; 1 output for each pump starter, valve operator, fail alarm, and horn INDICATORS Four front panel LED indicators display status and control functions of unit SWITCHES Sealed contact inputs one each for AUTO, OFF, HAND and ALM/SIL CUTOUT DIMENSIONS OVERALL DIMENSIONS 2008 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2402-7000, Rev. 2

MODEL 2403 VALVE STATUS MODULE.... Provides status indication and control of two-position valves. FEATURES Long life LED's provide indication of status and monitoring of control functions. OPEN-CLOSE-AUTO selector switches provide automatic operation with manual override. Failure system provides visual indication if valve fails to respond to control signal. Optional audible alarm available. 120VAC/24VDC/12VDC power source. DESCRIPTION Assuming the valve being controlled has limit switches which will signal a fully open, or fully closed position, the 2403 Valve Status Module operates in the following manner: If the valve is closed, the green CLOSED indicator will be lit. If the OPEN-CLOSE-AUTO pushbuttons are indexed to the AUTO mode, and an external contact closure signals the valve to begin to open, the red OPEN indicator will begin to flash intermittently, indicating the valve is to travel to this position. As the valve begins to open, the green CLOSED indicating lamp will go out, and the amber TRAVEL indicating lamp will glow steady, until the valve is fully open. When the valve is fully open the TRAVEL lamp will go out and the red OPEN indicating lamp will glow steady. When operation is reversed and the valve is to close, the red OPEN indicator goes out, the green CLOSED indicator flashes, and the amber TRAVEL light glows steady. When the valve reaches a fully closed position, the amber TRAVEL light will go out and the green CLOSED light will go from a flashing to a steady state condition. A time delay valve failure monitoring system is standard equipment, and is field adjustable from 0.2 to 60 seconds. If the valve does not operate within the specified time, the red FAIL indicating light will come on steadily. When coupled with the Essex Model 2401 Alarm Module, the red FAIL indicator on the 2403 will flash and an audible alarm will sound from the 2401. By pushing the alarm button on either the 2401 or 2403, the alarm will be silenced, and the red FAIL light will glow steady. An optional failure relay is available to activate external devices should a valve fail. Auxiliary contacts are included on the OPEN- CLOSE-AUTO pushbuttons to provide remote monitoring of these switches, or to provide the capability for interlocking. By using the electronic CONTROL output, or the FAIL output, a remote 24VDC relay can be used to provide additional contacts and higher current ratings where needed.

ELECTRICAL CONNECTIONS MODEL 2403 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. CONTROL INPUTS Contact closure or NPN transistor; 10 madc max. @ 24 VDC CONTROL OUTPUTS NPN solid state output; 50 VDC @ 60 madc max. per point; 1 output for each valve operator, fail alarm, and horn INDICATORS Four front panel LED indicators display status and control functions of unit SWITCHES Sealed contact inputs one each for AUTO, OPEN, CLOSE and ALM/SIL CUTOUT DIMENSIONS OVERALL DIMENSIONS 2008 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2403-7000, Rev. 2

MODEL 2404 ANNUNCIATOR.... Visually identifies an abnormal device or condition. FEATURES All solid state circuitry. Optically isolated alarm input contacts. 120VAC/24VDC/12VDC power source. Long life LED indicating lamps. Can accommodate from one to four points per unit. Switch selectable lock-in/nonlock-in and N.O./N.C. alarm input controls. Optional time delay on input. DESCRIPTION The Essex Model 2404 Annunciator is designed to monitor Alarm Contacts and provide "point" indication on the device which is alarming. The standard unit comes equipped to monitor two remote points, but can be optionally equipped to accommodate four points. Each point has a selector switch located on the 2404 drawout PC board, which will allow the point to be set up to monitor a normally open, or normally closed contact. A lock-in/nonlock-in switch is also provided on the PC board for each point. On lock-in or nonlock-in, the alarm indication flashes until acknowledged, whereupon it will light continuously until the field condition is corrected. In lock-in status, the alarming point must be acknowledged before it will reset. In the nonlock-in status, the unit will cease to alarm if the point being monitored returns to normal. An auxiliary output NPN transistor is standard for each alarm point. Transistor follows activation of the field input contact. An optional 0.1 to 60 second time delay is available on the input circuit. This avoids unnecessary alarm indication for those conditions which may be only momentary. ALARM SEQUENCE CHART FIELD ALARM AUDIBLE CONDITION CONTACT LIGHT ALARM* Normal Normal Off Off Alarm Abnormal Flashing On Silence Abnormal On Off Normal Normal Off Off Lamp Test Normal On Off *Mounted Externally

ELECTRICAL CONNECTIONS MODEL 2404 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. CURRENT THRU FIELD TROUBLE CONTACT 5mADC at 24VDC; optically isolated OPTIONAL TIME DELAY 0.1 to 60 second delay is available as a time delay on input before alarm is activated. AUXILIARY OUTPUTS Each alarm point has a NPN transistor auxiliary output capable of driving relays, lights, etc. Maximum transistor rating:50vdc @ 60mADC. CUTOUT DIMENSIONS OVERALL DIMENSIONS 2008 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2404-7000, Rev. 2

MODEL 2406 SEQUENCER.... Provides sequencing, cascading and/or paralleling of many pumps. FEATURES Front of panel switches provide easy setup of sequencing. Reliable...conservatively designed solid state control circuitry and isolated output circuits assure long operating life. Inputs are optically isolated from the 2406 electronics. Field selectable operation for filling or emptying. Long life LED's for input and output indication. Multiple units may be cascaded and/or paralleled to allow for control of more devices and/or levels. DESCRIPTION The Essex Engineering Model 2406 is a simple, yet reliable unit designed to offer the maximum of versatility in sequencing the operation of pumps or other operating devices. The 2406 is easy to set up for any desired sequence in the operation of up to four devices, with four levels of operation available for each device. As levels increase, or decrease, all of the previous level outputs are de-activated. Simply observe the last level LED which is on, follow the row of switches to the right and observe which units are on. Long life LED's on the front panel provide readily visible indication of the status of each pump and level. Up to four standard Model 2406 Sequencers may be connected together in series or parallel (or a combination of both), to provide for control of up to 16 devices at four levels, or four devices at 16 levels, or 8 devices at 8 levels. Special configurations are available; consult factory. The unit is solidly constructed and uses low Power CMOS Circuitry. It is designed for use in combination with the Essex Engineering Corporation Model 2410 Pump Controller, although it can be used with float switches, controllers, etc. of other manufactures. Technical details are shown on the reverse side of this bulletin.

ELECTRICAL CONNECTIONS MODEL 2406 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. CONTROL INPUTS Contact closure or NPN transistor; 10 madc max. @ 24 VDC CONTROL OUTPUTS NPN solid state output; 50 VDC @ 60 madc max. per point; 4 outputs for unit operation; 1 output for cascade operation INDICATORS Level Output - amber LED Control Output - red LED CUTOUT DIMENSIONS OVERALL DIMENSIONS 2006 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2406-7000, Rev. 2

MODEL 2407 ALTERNATOR MODULE.... Provides the capability to automatically alternate and sequence up to four pumps, blowers or other devices. FEATURES Variables are field programmable. Provides automatic or manual operation in increasing or decreasing order. Digital indication of lead unit. LED input and output status indicators. Front panel alternate sequence control. First on/first off OR first on/last off sequencing capability. DESCRIPTION The Model 2407 Alternator is a unit that provides for the on-off sequencing of various devices such as pumps, blowers, etc. The unit is extremely flexible with all of the set up parameters being customer settable via plug jumpers and/or switches mounted within the unit. These include first-on/first-off or first-on/last-off selection; sequencing in increasing or decreasing order; unit operation as DUPLEX, TRIPLEX or QUADRUPLEX; operation as alternator, contact in/contact out, or level control unit with latch-up mode. In the level control mode such devices as float switches can be used as inputs and will provide a level control system turning on the outputs in sequence and holding them on WITHOUT the use of external latching relays. When the STOP level float opens, all the outputs will be turned off. Front panel controls provide the operator with the ability to manually select the alternate mode of operation. When indexed to INTERNAL, the unit will alternate the sequence of operation when the last level is de-energized. When indexed OFF, alternation will not occur, except for use of the manual pushbutton on the instrument face. When in the REMOTE mode, the unit can be alternated by the use of an external device such as a time clock, pushbutton, etc.. The input indicator LED's will light as the various input contacts close allowing exact monitoring of the various levels. The output indicators will light as each output is required. If an output device, such as a pump, is indexed OFF, and a contact input is provided to the Alternator, the corresponding output LED will flash at a slow rate indicating the unit is inoperative and allowing the sequence to skip this unit. This feature will provide smooth uninterrupted sequencing of outputs by NOT having to wait for the next level to activate because a unit is inoperative. Also included are lead unit outputs to provide relay switching capability for analog signals, or remote indication of lead unit.

ELECTRICAL CONNECTIONS MODEL 2407 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. CONTROL INPUTS Contact closure or NPN transistor; 10 madc max. @ 24 VDC CONTROL OUTPUTS NPN solid state output; 50 VDC @ 60 madc max. per point; 4 outputs for unit operation; 4 outputs for lead unit indication/control INDICATORS Lead unit - 0.4" LED digit Input - amber LED Output - red LED CUTOUT DIMENSIONS OVERALL DIMENSIONS 2008 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2407-7000, Rev. 1

MODEL 2410 PUMP CONTROLLER.... A reliable, versatile unit designed specifically for control and monitoring of pumps, tanks, basins, etc... FEATURES Extremely accurate, repeatable and easy to use. Each output may be individually programmed for PUMP UP or PUMP DOWN operation. Digital indication of process variable and setpoints in desired engineering units. Setpoints are adjusted from front of instrument via 25-turn potentiometers. LED output status indicators. Standard and optional time delays are available to override system surging during operation and startup. DESCRIPTION The Essex Engineering Model 2410 Pump Controller is designed specifically for controlling the filling and emptying of tanks, vats or basins by means of one or more pumps. It accepts standard input signal levels of 1-5 VDC, 4-20 madc and special ranges from a continuous level or pressure transmitter. The incoming analog process signal is displayed on the front of the instrument via a 3-1/2 digit LED readout. This same display is also used to set the various turn on and turn off points for the control and alarm functions. Four outputs are available to activate remote relays. Each has an independent turn-on/turn-off setting of 0 to 100% of full scale. A unit indicator lamp is illuminated when its output is energized. Turn-on and turn-off points are set by means of their associated 25-turn potentiometers on the face of the instrument. Each point is set via the read and select pushbuttons which will illuminate a red bar adjacent to the potentiometer being calibrated. The output relays are remote and use low voltage control in order to avoid high voltage transients when the line voltage devices are switched on and off. Fill/empty action is field selectable for each control point via slide switches within the unit. Three alarms, two of which have an LED indicator, are provided. These are high and low level with the signal loss causing the low level LED to flash when activated. The 2410 Controller may be field programmed, via internal DIP switches, to deenergize the control outputs when any alarm condition occurs. An external input signal is also available to deactivate the control and/or alarms when activated. Standard with the unit is a time delay, field adjustable from 0.2 to 60 seconds, to inhibit control and alarm action on power up. This allows system parameters to stabilize before the controller initiates a response. Optional time delay boards are also available to provide various timing functions.

ELECTRICAL CONNECTIONS MODEL 2410 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. ANALOG INPUTS 4-20 madc @ 250Ω impedance 1-5 VDC @ 470KΩ impedance Factory specials ANALOG OUTPUTS Standard has NONE. Optional: Isolated 4-20mADC @ 0-800Ω LOAD CONTROL INPUTS Contact closure or NPN transistor; 10 madc max. @ 24 VDC CONTROL OUTPUTS NPN solid state output; 50 VDC @ 60 madc max. per point; 4 outputs for unit operation; 3 outputs for alarm indication; 1 output for horn or external alarm indication. INDICATORS 3-1/2 digit, 0.56" LED type display Control Output - amber LED Alarm Output - red LED REPEATABILITY & ACCURACY 0.2% of span, + 1 of least significant digit TIME DELAYS 0.2 to 60 second field adjustable time delay is provided for control and alarm functions to inhibit outputs when unit is initially powered. An optional 0.2 to 60 second, or special range, field adjustable time delay is available for OFF-ON and ALARM timing. CUTOUT DIMENSIONS OVERALL DIMENSIONS 2006 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2410-7000, Rev. 3

MODEL 2411 DUPLEX PUMP CONTROLLER.... A reliable, versatile unit designed for duplex control and alternation for basins, wetwells, tanks, etc... FEATURES Extremely accurate, repeatable and easy to use. Each output may be individually programmed for PUMP UP or PUMP DOWN operation. Digital indication of process variable and setpoints in desired engineering units. Setpoints are adjusted from front of instrument via 25-turn potentiometers. LED output status indicators. Standard and optional time delays are available to override system surging during operation and startup. DESCRIPTION The Essex Engineering Model 2411 Duplex Pump Controller is designed specifically for controlling the filling and emptying of tanks, vats or basins by means of two pumps. It accepts standard input signal levels of 1-5 VDC, 4-20 madc and special ranges from a continuous level or pressure transmitter. The incoming analog process signal is displayed on the front of the instrument via a 3-1/2 digit LED readout.this same display is also used to set the various turn-on and turn-off points for the control and alarm functions. Two outputs are available to activate remote relays. Each has an independent turn-on/turn-off setting of 0 to 100% of full scale. A unit indicator lamp is illuminated when its output is energized. Turn-on and turn-off points are set by means of their associated 25-turn potentiometers on the face of the instrument. Each point is set via the read and select pushbuttons which will illuminate a red bar adjacent to the potentiometer being calibrated. The lead unit is indicated via green LEDʼs which are adjacent to the #1-Alternate-#2 selector switch. The switch provides manual override of the alternation cycle. Fill/empty action is field selectable for each control point via slide switches within the unit. Three alarms, two of which have an LED indicator, are provided. These are high and low level with the signal loss causing the low alarm LED to flash when activated. The 2411 Controller may be field programmed, via internal DIP switches, to deenergize the control outputs when any alarm condition occurs. External inputs are available to deactivate the control and/or alarms or provide alternation via a push button or time clock contact. Standard with the unit is a time delay, field adjustable from 0.2 to 60 seconds, to inhibit control and alarm action on power up. This allows system parameters to stabilize before the controller initiates a response. Optional time delay boards are also available to provide various timing functions.

ELECTRICAL CONNECTIONS MODEL 2411 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. ANALOG INPUTS 4-20 madc @ 250Ω impedance 1-5 VDC @ 470KΩ impedance Factory specials ANALOG OUTPUTS Standard has NONE. Optional: Isolated 4-20mADC @ 0-800Ω LOAD CONTROL INPUTS Contact closure or NPN transistor; 10 madc max. @ 24 VDC CONTROL OUTPUTS NPN solid state output; 50 VDC @ 60 madc max. per point; 2 outputs for unit operation; 3 outputs for alarm indication; 1 output for horn or external alarm indication. INDICATORS 3-1/2 digit, 0.56" LED type display Control Output - amber LED Alarm Output - red LED REPEATABILITY & ACCURACY 0.2% of span, + 1 of least significant digit TIME DELAYS 0.2 to 60 second field adjustable time delay is provided for control and alarm functions to inhibit outputs when unit is initially powered. An optional 0.2 to 60 second, or special range, field adjustable time delay is available for OFF-ON and ALARM timing. CUTOUT DIMENSIONS OVERALL DIMENSIONS 2005 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2411-7000, Rev. 2

MODEL 2415 MANUAL LOADING STATION.... Utilizes analog signals to provide automatic or manual control of various devices. FEATURES 3 1 /2 digit LED display provides large, easy to read digital indication of process. Digital readout of process variable in engineering units or 0 to 100.0%. Ten turn potentiometer provides fine tuning of manual set point. AUTO/MANUAL push button with "READ" push button provides for a manual bumpless transfer. Isolated 4 to 20 madc output. Available for use with 120 VAC,12 or 24 VDC power. DESCRIPTION The Essex Model 2415 Manual Loading Station is a conservatively designed, reliable unit that provides a 4 to 20 madc output which is directly proportional to a voltage or current input. When in the AUTOMATIC mode, the output is directly proportional to the input, and the digital display will indicate the AUTO input signal. While in the AUTOMATIC mode, when the READ button is depressed, the digital display will then indicate the MANUAL value. By manipulating the SET potentiometer the MANUAL value can be made to equal the previously noted AUTO input signal, thereby providing a "bumpless" transfer. Conversely, when in the MANUAL mode, the digital display indicates the manual set point. By depressing the READ button, the digital display will show the AUTO input signal. By releasing the button and adjusting the SET potentiometer, the MANUAL signal can be made to equal the previously noted AUTO signal. Therefore, when going from or to AUTO or MANUAL operation, bumpless transfer can be achieved.

ELECTRICAL CONNECTIONS MODEL 2415 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 50 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. CONTROL INPUT IMPEDANCE 1 TO 5 VDC = 1 megohm 4 to 20 ma DC = 250 ohm CONTROL OUTPUT 4 to 20 madc isolated @ 0-800 ohm load INDICATOR 3-1/2 digit, 0.56" LED type display REPEATABILITY AND ACCURACY 0.2% of span + 1 digit AVAILABLE OPTION The Model 2415 can be provided as a manual unit only, without the READ button and AUTO/ MANUAL switch. It merely provides a 4 to 20 madc output signal. CUTOUT DIMENSIONS OVERALL DIMENSIONS 2005 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2415-7000, Rev. 2

MODEL 2416 MANUAL LOADING STATION.... Utilizes analog signals to provide automatic or manual control of various devices. FEATURES 3 1 /2 digit LED displays provides large, easy to read digital indication of both process variable and output signals. Digital indication of process variable in desired engineering units. AUTO to MANUAL bumpless transfer. MANUAL to AUTO field settable timed ramping. Isolated output. Pushbutton increase/decrease control in MANUAL mode. DESCRIPTION The Essex Model 2416 Manual Loading Station is a conservatively designed, reliable unit that provides a 4-20 madc output which is directly proportional to a voltage or current input. Data conversion is very accurate, done via 12-bit A/D and D/A modules. When in the AUTO mode, the output is directly proportional to the input, with the large upper digital display indicating the process variable and the small lower display indicating the percent output. Transfer from AUTO to MANUAL is bumpless with no change in the output. The output can then be increased or decreased via the UP and DOWN pushbuttons. Transfer from MANUAL to AUTO utilizes a field settable ramp time, or the output may be manually changed to match the input, via pushbuttons. The unit contains several field selectable variables such as ramp time from 0.2 to 64 seconds for a zero to one hundred percent output change and zero or non-zero reset on power up. Transferring between AUTO and MANUAL modes is accomplished via the AUTO/MANUAL pushbutton. Indicators are provided to display in which mode the controller is operating. Also available in the unit are several optional features. They include MANUAL ONLY, which has no analog input, no AUTO mode capability, and both displays read the output; or MANUAL ONLY WITH PV, which is the same as the standard unit, bit with no AUTO mode capability.

ELECTRICAL CONNECTIONS MODEL 2416 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. ANALOG INPUTS (standard, except with Manual Only option) 4-20 madc @ 250Ω impedance 1-5 VDC @ 470KΩ impedance Factory specials CONTROL OUTPUTS Isolated 4-20mADC @ 0-800Ω LOAD SPDT relay contact for AUTO/MANUAL status; 0.5A @ 120VAC RAMP TIMING 0.2 to 64 seconds in 7 selectable steps for 0-100% output INDICATORS Process - 3-1/2 digit, 0.56" LED type display Output - 3-1/2 digit, 0.3" LED type display REPEATABILITY & ACCURACY 0.2% of span, + 1 of least significant digit AVAILABLE OPTIONS Manual only - Unit provides a 4-20 madc output signal, using both readouts as OUTPUT display Manual only with PV - Unit provides a 4-20 madc output signal, using Process readout as PROCESS display and small readout as OUTPUT display CUTOUT DIMENSIONS OVERALL DIMENSIONS 2008 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2416-7000, Rev. 2

MODEL 2420 RATIO STATION MODULE.... Provides ease of use and flexibility in chemical feed systems. FEATURES Provides precision control over the process. Competitively priced. Parallel indicating vertical edge meters allow direct comparison between input and output. Digital thumbwheels provide for accurate set points. DESCRIPTION The Essex Engineering Model 2420 Ratio Station Module is a ratio controller that allows the precise ratioing of input and output signals on a continuous basis. It is designed to be used in water treatment plants and in the chemical processing industry. It offers the ability to control such items as chemical feed equipment, paced from flow, pressure or other type signals, by a multiplication factor of 0.1 to 3.9 times the input level. Standard indication of the ratios is by means of two 31/2" vertical edge meters, calibrated 0-100%. Custom scales are available for special applications. Both the standard input and output signals are 4-20 madc, with the ratio being selected by means of two digital thumbwheels. The ratio range is 0.1 to 3.9, selected in 0.1 step increments, with the accuracy being 0.2% of span. The Model 2420 Ratio Station is designed to be used with the other units in the Essex 2400 series controllers, although it is feasible to incorporate the unit with controllers of other manufacture. Consult the factory for proper application and/or special inputs, outputs and scales.

ELECTRICAL CONNECTIONS MODEL 2420 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C POWER INPUT 120 VAC + 10% 15W max. 24 VDC + 10% 650 madc max. 12 VDC + 10% 1200 madc max. ANALOG INPUTS 4-20 madc @ 250Ω impedance 1-5 VDC @ 470KΩ impedance Factory specials ANALOG OUTPUTS 4-20mADC @ 0-800Ω LOAD Optional: Isolated 4-20mADC @ 0-800Ω LOAD STANDARD INDICATORS 31/2" vertical edge input meter; 0-100% scale 31/2" vertical edge output meter; 0-100% scale REPEATABILITY AND ACCURACY 0.2% of span RATIO SETPOINT 0.1 to 3.9 - Set by two digit thumbwheel switches in 0.1 increments AVAILABLE OPTIONS Consult factory CUTOUT DIMENSIONS OVERALL DIMENSIONS 2006 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 2420-7000, Rev. 2

MODEL 3905 DUPLEX ALTERNATOR.... A reliable, modular unit designed specifically for use with the Model 2410 Controller to provide alternation. DESCRIPTION The Essex Engineering Model 3905 Duplex Electronic Alternator is a modular unit designed to be used between the Model 2410 Controller and the Series 3800 relay card. Its modular construction provides for easy replacement and/or trouble shooting. It plugs into a standard eight pin socket. The unit has two LED's on the cover to indicate which output will be LEAD on the next activation. ELECTRICAL CONNECTIONS MODEL 3905 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C Series 3800 Relay Card } +24VDC Output #2 Output #1 3 2 +24VDC } 4 5 Lead input 6 Lag input 7 COM 1 8 Model 2410 Controller Output POWER INPUT 24 VDC + 10% 15mA maximum MODULE INPUTS Contact closure from either pin 5 or 6 to COM 15VDC @ 1mA maximum MODULE OUTPUTS NPN transistor output 50VDC @ 60mA maximum PHYSICAL DIMENSIONS 2.375(W) x 1.75(D) x 3.00(H), base to top of LED 2006 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 3905-7000, Rev. 0

MODEL 3907 LOOP POWER SUPPLY.... A reliable, modular unit designed specifically for providing loop power for instrument systems. DESCRIPTION The Essex Engineering Model 3907 Loop Power Supply is designed to provide 24VDC loop power for electronic transmitters. It is designed as a modular unit which plugs into a standard eight pin socket. This facilitates easy replacement and/or trouble shooting by simply unplugging the unit. An LED on the unit cover indicates the presence of 24VDC at the designated pins. With it's 100 madc output capability, it can power up to five (5) 4-20 madc instrument loops ELECTRICAL CONNECTIONS 24VDC @100mA COM + 4 5 MODEL 3907 SPECIFICATIONS AMBIENT OPERATING TEMPERATURE RANGE 0 to 40 o C 3 2 6 7 POWER INPUT 120 VAC + 10% 2W Max. H 1 8 120 VAC NOTES 1. 24 VDC is also available at terminal 1 (common) and terminal 8 (+). 2. 120 VAC power source to power supply module should contain a 1/8 A. slo-blow fuse for electrical overload protection. N POWER OUTPUT 24 VDC @ 100mA NL/FL = 0.2% Ripple = 8MV P-P @ Full Load The output is short circuit protected for momentary shorts. However, a sustained short circuit may damage or burn-out the power supply. PHYSICAL DIMENSIONS 2.375(W) x 1.75(D) x 3.00(H), base to top of LED 2006 Essex Engineering Corp. All Rights Reserved. Printed in U.S.A. Pub. No. 3907-7000, Rev. 0