1 EXD-SH1/2 Controller for EX/FX/CX with ModBus Communication Capability Technical Bulletin EXD-SH1/2 are stand-alone universal superheat and or temperature controllers for air conditioning units or refrigeration systems. Features EXD-SH1: Control of one valve EXD-SH2: Control of two valves in two independent circuits Main function Circuit 1 Circuit 2 EXD-SH1 Superheat or temperature control EXD-SH2 Superheat or temperature control Superheat Control Other functions: Limitation of evaporating pressure (MOP), Low pressure switch, freeze protection and manual positioning of valve(s) Self-adapting superheat control function in conjunction with EMERSON FX5-9, EX4-8 and CX4-7 series For multiple refrigerants, including ultralow temperature refrigerant R23 (RTU) communication Integrated keyboard with two lines display Monitoring of sensors and detection of sensor (ECN/PT5) /stepper motor wiring failures Optional upload/download key (accessory) for transmission of parameter settings among controllers with the same setting Low/high superheat alarm as well as other function alarms Electrical connection via plug-in type screw terminals included with controller and Micro Molex EXD-M03 (must be ordered separately) DIN rail mounting housing EXD-SH2 EXD-M03 Selection table Type Description Part No. Multipack Single pack Controllers EXD-SH1 Controller for single refrigeration circuit EXD-SH2 Controller for two independent refrigeration circuits EXD-M03 Molex terminal with 3 meter wires ECN-N30 Temperature sensor with 3 m cable ECN-N60 Temperature sensor with 6 m cable ECN-Z60 Ultralow Temperature sensor with 6 m cable Pressure transmitters: PT5 (7/16-20UNF connection) PT5-07M Sensing pressure range bar M PT5-18M Sensing pressure range 0 18 bar M PT5-30M Sensing pressure range 0 30 bar M PT5-50M Sensing pressure range 0 50 bar M PT5-150D Sensing pressure range bar (1/4 NPTF) Pressure transmitters: PT5 (Brazing connection) PT5-07T Sensing pressure range bar M PT5-18T Sensing pressure range 0 18 bar M PT5-30T Sensing pressure range 0 30 bar M PT5-50T Sensing pressure range 0 50 bar M Note: Pressure range 18 bar for system with R410A, 30 bar for R410A economizer, 50/150 bar for CO 2 PT5-xxM Multipack = 20 pcs, PT5-xxT Multipack = 10pcs
2 Accessories Type Description Part No. Multipack (20 pieces) Single pack M12 Plug and cable for pressure transmitters PT5 PT4-M m M PT4-M m M PT4-M m M Uninterruptible Power supply ECP-024 Backup battery with two outputs for two controllers K09-P00 Electrical Terminal Kit for ECP EXD-PM Super cap for only EXD-SH1 (two pieces of EXD-PM required for one EXD-SH2) Description of functions Controllers are featured with a main function as superheat controller or temperature controller. The main function is selectable. Superheat control of evaporators or economizers This function requires the connection of temperature sensor(s) as well as pressure transmitters(s). The other functions are: MOP control: enables the limitation of saturated temperature of suction line (outlet of evaporator/economizer) Low pressure behaves similar to low pressure switch including alarm conditions Freeze protection is based on saturated temperature from converting measuring suction pressure. It provides alarm condition below certain adjusted temperature. Temperature controller The function is to maintain desired temperature by modulating refrigerant mass flow. If controller is operated as temperature controller, the connection of pressure transmitter is not required. In order to fulfill varieties of the applications, the refrigerant mass flow variation can be set according temperature increase or decrease. Temperature control in normal sense (A: Mass flow increases if temperature rises) Valve opening % Temperature control in reverse sense (B: Mass flow decreases if temperature rises) Valve opening % 100% 100% 0% Temperature 0% Temperature 1tAL 1tst 1tAH 1tAL 1tst/ 1tAH Examples of applications: Temperature control by throttling suction mass flow (normal sense, A) Temperature control by modulating hot gas into inlet or outlet of evaporators (reverse sense, B) Discharge temperature control by injecting liquid (normal sense, A) Head pressure control by means of temperature control (normal sense, A) 2
3 Wiring Wiring options: UPS (ECP-024) /Supercap (EXD-PM) UPS for up to two controllers One supercap for one EXD-SH1 T See parameter 2uP * Two supercaps for one EXD-SH2 P Circuit 1 (EXD-SH1/SH2) Circuit 2 (EXD-SH2) Electronic expansion valve EXV-M Electrical plug: wire colors WH-white BK-black BL-blue BN-brown Electronic expansion valve EXV-M Electrical plug: wire colors WH-white BK-black BL-blue BN-brown Download/upload key 1 & 7 Supply voltage 24 VAC/DC & 8 Temperature sensor 23 & 24 RS485 (+/-terminal) 3 & 8 Temperature sensor 25 & 26 Alarm relay (C, NO) Suitable for 24 VAC/DC 4 & 5 PT5 & Alarm relay (C, NO) Suitable for 27 & 28 (white wire: 4 20 ma signal) 24 VAC/DC VDC Voltage input for PT5 Digital input circuit1 (DI1) Dry contact, 29 & 30 (brown wire) potential free Alternative ratiometric third Party Pressure Digital input (DI2) Dry contact, 31 & 30 Transmitter: potential free 4 & 5 Pressure transmitter & ( V signal) 35 & 36 Battery/Super capacitor connection terminal VDC voltage input Fuse 10 GND Ground 6,12,13, Not used (Terminals on EXD-SH12) 18,32-34 Note: No hard failure detection if ground wire of transmitter to be interrupted. *) Parameter 2uP with No. 8 = only Pressure sensor is used 3
4 Available configuration options Selectable Valves FX5-9 EX4-8 CX4-7 R134a, R407C, R410A, R22, R22; R134a; R507; R404A; R407C; R410A; R124; R744; Refrigerants R32*, R22, R134a, R407C, R407A; R407F; R23; R32*; R744 (CO2) R410A, R450A, R513A R1234ze; R448A; R449A; R450A; R513A Main function Superheat control Superheat or and temperature control Superheat control Pressure transmitters PT5 or 3 rd party ratio metric PT5 or 3 rd party ratio metric PT5 *) R32 is for systems/regions which it does not consider R32 as potential explosive media (flammable or low flammable) and PED/CE marking is not required. EXD-SH1/2 IS NOT ATEX APPROVED. Technical Data: EXD-SH1/2 Supply voltage 24 VAC/DC ±10%, 50/60 Hz Mounting DIN rail mounted Temperatures EXD-SH1: Max. 25 VA Power consumption storage -25 C +60 C EXD-SH2: Max. 50 VA operating/ surrounding 0 C +55 C Terminals 1 to 12 Suitable for 12 poles molex plug Relative humidity Terminals 13 to 36 Suitable for removable screw version: wire size mm 2 Included in controller delivery Accessory (12 poles molex plug with 3 m cable) 20 85% non condensing Type: EXD-M03 (to be ordered separately) Protection class IP 00 Housing Self-extinguishing ABS Compliance EMC, RoHS, Weight 320 g Marking, Input, Output EXD-SH1/2 Description Analogue input(s): NTC Temperature sensor Analogue input: PT1000 Temperature sensor Analogue input(s): 4 20 ma pressure transmitters Analogue input(s): V pressure transmitters Digital input(s) Digital output(s): Alarm relay(s) Contact is closed: During alarm condition Contact is open: During normal operation and supply power OFF Communication Stepper motor output Specification ECN-N (-45 C +50 C sensing range) ECN-Z60 (-80 C -40 C sensing range) PT5 Third party ratio metric pressure transmitters (total error: 1%) Dry contact, potential free Resistive Load 24 VAC/DC, max. 1 A Inductive Load 24 V AC, max. 0.5 A RS485 RTU, two wires Valves: EX4-8, CX4-7 and FX5-9 4
5 125,5 EXD-SH1/2 Controller with ModBus Communication Capability Optional EXD-PM supercap Supply voltage 24 VAC/DC ±10%, 50/60 Hz Protection class IP 20 Output voltage 12 VDC Mounting DIN rail mounted Temperatures Max. output current storage A ma during charging -20 C +70 C operating/ surrounding -10 C +60 C Power consumption 12 VA Housing Self-extinguishing ABS Terminals Suitable for removable screw version: 20 85% wire size mm 2 Relative humidity non condensing Output: to Suitable for one EXD-SH1 driver/controller Two EXD-PM for one EXD-SH2 Marking, pending Charging time 60 seconds Weight 125 g Max. cable length between EXD-PM and EXD-SH1/2 50 cm AWG18 wire size Optional Uninterruptible Power Supply ECP-024 Backup battery type Lead acid gel rechargeable battery Protection class IP 20 Number of backup batteries 2, each 12 VDC, 0.8 Ah Mounting DIN rail mounted Supply voltage 24 VAC ±10%, Hz Temperatures storage operating/ surrounding -20 C +65 C -10 C +60 C Output voltage, UB 18 VDC Housing Aluminum Number of outputs to < 90% 2 Relative humidity drivers non condensing Battery recharge time approximately 2 hours Connection Screw terminals for wire size mm 2 Marking, Accessories: Terminals K09-U00 Part.No: Weight 1200 g Dimensions [mm] ,5 117, Ø4,3 EXD-SH1/2 or EXD-PM ECP-024 5
6 Communication The use of communication is not necessary/mandatory; however, the communication is available for connection to upper level of system controller (third party controller) in order to perform data and commands transfer as well as data logging. EXD-SH1/2 act as slave and third party controller is master. In case of several EXD-SH1/2 connections to master, each driver needs to be ed for proper communication. Bus topology ModBus protocol details Mode: RTU slave range: 1 to 127 (parameter Adr) Baud rate: 9600 bps, bps (default, parameter Br) Start bit: 1 Data bits: 8 Parity: even (default), no parity (parameter Par) Stop bits: 1 Master response timeout: 500ms Transmission Details ModBus register ranges Read-only data: Starting : 0x0100 (256) Writable data: Starting : 0x0200 (512) Configuration data: Starting : 0x0300 (768) 6
7 Read Data transmission Available through Function code 03 (0x03) Read Holding Registers Request Function code 1 Byte 0x03 Starting Address 2 Bytes 0x0000 to 0xFFFF Register count 2 Bytes 1 to 125 (0x7D) Response Function code 1 Byte 0x03 Byte count 1 Byte 2 x N* Holding Registers N* x 2 Bytes *N = Quantity of Input Registers Error Error code 1 Byte 0x83 Exception code 1 Byte 01 or 02 or = Function code not supported 02 = Starting Address or register count out of range 03 = Register count out of range Write Data transmission (single register) Available through Function code 06 (0x06) Write Holding Register Request Function code 1 Byte 0x06 Starting Address 2 Bytes 0x0000 to 0xFFFF Value 2 Bytes 0x0000 to 0xFFFF Response Function code 1 Byte 0x06 Starting Address 2 Bytes 0x0000 to 0xFFFF Value 2 Bytes 0x0000 to 0xFFFF Error Error code 1 Byte 0x86 Exception code 1 Byte 01 or 02 or = Function code not supported 02 = Starting Address out of range Write Data transmission (multiple registers) Available through Function code 16 (0x10) Write Holding Registers Request Function code 1 Byte 0x10 Start Address 2 Bytes 0x0000 to 0xFFFF Register count 2 Bytes 0x0001 to 0x0078 Byte count 1 Byte 2 x N Registers values 2 x N Bytes Value N = register count. Response Function code 1 Byte 0x10 Starting Address 2 Bytes 0x0000 to 0xFFFF Register count 2 Bytes 0x0001 to 0x0078 Error Error code 1 Byte 0x90 Exception code 1 Byte 01 or 02 or = Function code not supported 02 = Register Address invalid 03 = Register Value out of range 7
8 Read-only variables dec. hex x100 Software version Description Unit Remarks Circuit 1 Hexadecimal format 1 hex digit for controller type 1 = SH1, 2 = SH2 1 hex digit for major revision 2 hex digits for minor revision 257 0x101 Main function, 0 = superheat control 1 = temperature control 2 = reverse temperature control 258 0x102 Valve opening 1/100 % 259 0x103 Digital input 0x0000 = No demand 0x0001 = Demand 260 0x104 Digital output 0x0001 = alarm relay 261 0x105 P1 suction pressure 1/100 barg 262 0x106 T1 suction temperature 1/100 C 263 0x107 Sat. Temp 1/100 C 264 0x108 Pressure 1 sensor failure 0 = No failure 1 = Failure 265 0x109 Temp 1 sensor failure 0 = No failure 1 = Failure 266 0x10A Functional Alarm set 0x0001 = N/A 0x0002 = Low pressure 0x0004 = High superheat 0x0008 = Low superheat 0x0010 = Freeze 0x0020 = Max. Temp (Temp control) 0x0040 = Min. Temp (Temp control) 267 0x10B Hardware alarm set 0x0001 = Temp sensor 1 0x0002 = Temp sensor 2 (SH2) 0x0004 = Pressure sensor 1 0x0008 = Pressure sensor 2 (SH2) 0x0010 = Stepper 1 0x0020 = Stepper 2 (SH2) 0x0040 = timeout (3sec) 0x0080 = Config. inconsistency 1 0x0100 = Config. inconsistency 2 0x0200 = Power Failure 268 0x10C Application state 0 = OFF 1 = Waiting startup (valve reference is pending) 2 = Startup 3 = Control 4 = Closing 5 = Alarm 6 = Manual mode 7 = Power fail 8 = MOP 269 0x10D Superheat set point 1/100 K 270 0x10E Superheat 1/100 K 8
9 Read-only variables dec. hex. Description Unit Remarks Circuit x10F Valve opening 1/100 % 272 0x110 Digital input 0 = no demand 1 = demand 273 0x111 Digital output 0x0001 = alarm relay 274 0x112 P2 suction pressure 1/100 bar 275 0x113 T2 suction temperature 1/100 C 276 0x114 Sat. Temp 1/100 C 277 0x115 Pressure 2 sensor failure 0 = No failure 1 = Failure 278 0x116 Temp 2 sensor failure 0 = No failure 1 = Failure 279 0x117 Functional alarm 0x0001 = N/A 0x0002 = Low pressure 0x0004 = High superheat 0x0008 = Low superheat 0x0010 = Freeze 280 0x118 Application state 0 = OFF 1 = Waiting startup (valve reference is pending) 2 = Startup 3 = Control 4 = Closing 5 = Alarm 6 = Manual mode 7 = Power fail 8 = MOP 281 0x119 Superheat setpoint 1/100 K 282 0x11A Superheat 1/100 K 9
10 Writable variables dec. hex. Display code Description Unit Remarks 512 0x0200 Factory default 1 = do a factory default 513 0x0201 Future use 514 0x0202 Alarm reset 1 = Resets alarms (only the alarms which are set as manual reset) 515 0x0203 1Ho Manual mode 0 = off, 1 = on 516 0x0204 1HP Manual valve opening % only active while manual mode = on 517 0x0205 Demand Alternative to digital input, via 1 = enabled 518 0x0206 Pressure via 519 0x207 Digital output 1/100 barg Pressure if 1uP selection is Range: barg Minimum update rate: 1s Alarm timeout: 3 sec. To set the relay 1 manually, only active when manual mode = on 0 = off 1 = on 520 0x0208 2Ho Manual mode 0 = off, 1 = on 521 0x0209 2HP Manual valve opening % only active while manual mode 2 = on 522 0x020A Alternative to digital input, via 523 0x020B Pressure via 524 0x20C Digital output Note: References to control are invisible in configuration/write list if disabled. 1/100 barg Demand 1 = enabled Pressure if 2uP selection is Range: -0.1 to 150 barg Minimum update rate: 1s Alarm timeout: 3 sec. To set the relay 2 manually, only active when manual mode = on 0 = off 1 = on Configuration parameters dec. hex. Display code Description Unit Default value Range Remarks 768 0x300 H5 Password x301 Adr x302 br baudrate = 9600 baud 1 = baud 771 0x303 PAr parity = parity even 1 = no parity 773 0x305 -C2 Circuit 2 Enabled = disabled 1 = enabled Only EXD-SH x306 -uc Units conversion = C, K, barg 1 = F, psig This parameter only affects the display. Internally (as well as for MODBUS communication) the units are always SI-based x307 Future use 776 0x308 Future use 10
11 Configuration parameters dec. hex. Display code Description Unit Default value Range Remarks Circuit x309 1Fct Function Changes only allowed if is in OFF state 0 = superheat control 1 = Temperature control Normal sense 2 = Temperature control Reverse sense 778 0x30A 1u4 Control mode = standard control 1 = slow control 2 = intermediate control Changes only allowed if is in OFF state 0 = R22, 1 = R134a, 2 = R507, 3 = R404A, 4 = R407C, 5 = R410A, 779 0x30B 1u0 Refrigerant = R124, 7 = R744 8 = R407A, 9 = R407F, 10 = R23, 11 = R32 12 = R1234ze, 13 = R448A 14 = R449A, 15 = R450A 16 = R513A 780 0x30C 1uP Pressure sensor type Changes only allowed if is in OFF state 0 = PT5-07x, 1 = PT5-18x 2 = PT5-30x 3 = PT5-50x 4 = PT = Ratio metric(gauge) 6 = Ratio metric(absolute) 7 = 781 0x30D 1Prr Ratio metric range 1 1/10 bar If ratiometric is used Changes only allowed if is in OFF state 0 = EX4-6, 1 = EX7, 782 0x30E 1ut Valve type = EX8, 3 = FX5, 4 = FX6, 5 = FX6.5, 6 = FX7, 7 = FX7.5, 8 = FX8, 9 = FX9, 10 = CX4-6, 11 = CX x30F 1uF Valve scaling 1 % x310 1uu Start opening valve1 % x311 1u x312 1uL 787 0x313 1u5 Start opening duration valve 1 Low superheat alarm mode Superheat setpoint s /10 K x314 1u2 MOP mode Note: Number of overwriting is limited. Please consult Emerson sales office. 2 = enabled manual reset Range = 3 30K with 1uL = 1,2 1 = enabled 11
12 Configuration parameters dec. hex. Display code Description Unit 789 0x315 1u3 MOP sat. temp. limit 1/10 C 790 0x316 1P x317 1PA 792 0x318 1Pb 793 0x319 1Pd 794 0x31A 1P4 Low pressure alarm mode Low pressure alarm cut-out Low pressure alarm delay Low pressure alarm cut-in Freeze alarm mode Default value 1/10 bar 0 Range s /10 bar x31B 1P2 Freeze alarm cut-out circuit 1 1/10 C x31C 1P5 Freeze alarm delay s x31D 1uH High superheat alarm mode x31E 1uA High superheat alarm setpoint 1/10 K x31F 1ud High superheat alarm delay min x320 1tSt Temperature set point 1/10 C x321 1tbd Temperature band 1/10 K x322 1tAF Temperature alarm enable x323 1tAL Min. temperature alarm setpoint 804 0x324 1tdL Min. temperature alarm delay 805 0x325 1tAH Max. temperature alarm setpoint 806 0x326 1tdH Max. temperature alarm delay 807 0x327 Future use 808 0x328 Future use 1/10 C min /10 C min x329 1tt- Temperature sensor type Circuit x32A 2u4 Control mode x32B 2u0 Refrigerant Remarks 2 = enabled manual reset 2 = enabled manual reset 1 = enabled 0 = ECN-Nxx 1 = ECN-Z60 0 = standard control 1 = slow control 2 = intermediate control Changes only allowed if is in OFF state 0 = R22, 1 = R134a, 2 = R507, 3 = R404A, 4 = R407C, 5 = R410A, 6 = R124, 7 = R744 8 = R407A, 9 = R407F, 10 = R23, 11 = R32 12 = R1234ze, 13 = R448A 14 = R449A, 15 = R450A 16 = R513A Note: Number of overwriting is limited. Please consult Emerson sales office. 12
13 dec. hex. Display code 812 0x32C 2uP Description Pressure sensor type Unit Default value Range Remarks Changes only allowed if is in OFF state 0 = PT5-07x 1 = PT5-18x 2 = PT5-30x 3 = PT5-50x 4 = PT = Ratio metric (gauge) 6 = Ratio metric (absolute) 7 = 8 = Pressure sensor circuit1 is used (1uP) 813 0x32D 2Prr Ratio metric range 1/10 bar If ratio metric is used Changes only allowed if is in OFF state 0 = EX4-6, 1 = EX7, 814 0x32E 2ut Valve type = EX8, 3 = FX5, 4 = FX6, 5 = FX6.5 6 = FX7, 7 = FX7.5, 8 = FX8, 9 = FX9, 10 = CX4-6, 11 = CX x32F 2uF Valve scaling % x330 2uu Start opening valve % x331 2u9 Start opening duration valve s x332 2uL Low superheat alarm mode = enabled manual reset 819 0x333 2u5 Superheat setpoint 1/10 K Range = 3 30K with 1uL = 1, x334 2u2 MOP mode = enabled 821 0x335 2u x336 2P x337 2PA 824 0x338 2Pb 825 0x339 2Pd MOP sat. temp. limit Low pressure alarm mode Low pressure alarm cut-out Low pressure alarm delay Low pressure alarm cut-in 1/10 C 1/10 bar s /10 bar x33A 2P4 Freeze alarm mode x33B 2P2 Freeze alarm cut-out 1/10 C x33C 2P5 Freeze alarm delay s x33D 2uH High superheat alarm mode x33E 2uA High superheat alarm setpoint 1/10 K x33F 2ud High superheat alarm delay min x329 2tt- Temperature sensor type Note: Number of overwriting is limited. Please consult Emerson sales office. 2 = enabled manual reset 2 = enabled manual reset 0 = ECN-Nxx 1 = ECN-Z60 13
14 Emerson Climate Technologies GmbH shall not be liable for errors in the stated capacities, dimensions, etc., as well as typographic errors. Products, specifications, designs and technical data contained in this document are subject to modification by us without prior notice. Illustrations are not binding. The Emerson Climate Technologies logo is a trademark and service mark of Emerson Electric Co. Emerson Climate Technologies Inc. is a subsidiary of Emerson Electric Co.
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ORIGA-SENSOFLEX Displacement Measuring System for Cylinder Series OSP-P Contents Description Data Sheet No. Page Overview P-1.50.001E 117-118 Technical Data SFI-plus P-1.50.002E-1, 2 119-120 Dimensions
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Engineering Guideline pac-carriers Type 9195 for TRICON system TRICONEX TMR PLC 2 Engineering Guideline TRICON system 14.10.2009 Content Signal type Control system I/O cards type pac-carrier Channels Slots
OPTISENS TUR 2000 Technical Datasheet Sensor for turbidity measurement in water and wastewater Rugged design for harsh applications Integrated transmitter with direct 4...20 ma output Near infrared light
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Controller for controlling one evaporator EKC 414A1 REFRIGERATION AND AIR CONDITIONING Manual Introduction Application The controller is a complete control unit for refrigeration appliances with integrated
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TEMPERATURE CONTROLLER DIN-sized (96 x 96-mm) Temperature Controller Featuring Advanced PID Control and Heater Burnout Detection Advanced PID control with two degrees of freedom to improve stability and
Flopurge TS Operation Manual Part Number 079-0204 Spectron Gas Control Systems United Kingdom Unit 4, Herald Court, University of Warwick Science Park, Coventry, CV4 7EZ +44 (0)24 7641 6234 email@example.com
DT6500 CONTROLLER for the AQUARIUS DEIONIZED WATER HEATING SYSTEM ICD PART #: 306960 ICD SERIAL #: 1714 ICD/Heateflex 405 E. Santa Clara St. Arcadia, CA 91006-7218 TEL: (626)599-8566; FAX: (626)599-9567
New: now with App and Bluetooth. Measurement Solutions for Refrigeration Technology. Complete solution for the commissioning and maintenance of refrigeration systems and heat pumps. testo 549, testo 550,
Installation guide ERC 213 Digital regulator for refrigeration and defrosting, 3 relays. 520H11062 The ERC 213 is a smart, multipurpose refrigeration controller with temperature and defrost management,
Digital Timer Interface Installation / Operation Instructions General Thank you for choosing Webasto to meet your heating needs. The Webasto SmarTemp Control fx 2.0 enables you to preset start-up cycles
IC2L Series User manual DIXELL INDEX 1 GENERAL ADVICE 7 2 GENERAL FEATURES 8 2.1 MAIN FUNCTION 8 3 IC2 L TABLE OF THE FEATURES 1 4 USER INTERFACE 11 4.1 FUNCTION OF THE LEDS OF THE KEY BUTTONS 11 4.2 USE
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SM3000 Videographic Recorder User Guide (RTU) Communications Option ABB The Company We are an established world force in the design and manufacture of instrumentation for industrial process control, flow
ELECTRONIC HUMIDISTAT: H0 ONE OR TWO STAGES HUMIDITY SUPPLY OUTDOOR TEMPERATURE RESET DESCRIPTION The H0 series low voltage, microcomputerbased PI (proportional and integral) humidistats are designed for