S TEM PRODUCT SPECIFICATION

Transcription

1 NOTE: Some sections of this specification apply only to I or newer. DESCRIPTION: The 2251TEM product is a photo-thermal sensor designed to meet the CEA Guideline for multisensor smoke detectors. This product can communicate with 200/500 Series and Enhanced communication protocol. Remote LED and internal LED can be controlled separately (see Separate operation of remote LED) The detector include a drift compensation algorithm to last longer without cleaning. When drift compensation has reached its limit (Drift Limit) a unique signal is generated in PW4 signifying this state. The unprocessed raw chamber value can be available in PW6 corresponding to the data range shown in the Drift Compensation Constants table, without the internal processing. This feature is factory programmable only. Magnet test generates an alarm (level 5) unless the device determines it is incapable of alarming (low chamber). The device will then enter an algorithm bypass mode for the next 10 minutes. At this time the processing of the signal is limited so that canned smoke can easily and quickly cause an alarm signal. After 10 minutes the device returns to its normal operation. There is a provision for determining whether an alarm is due to heat (Level 6). This allows the control panel to ignore smoke alarms during periods of time while still offering some level of detection. A unique sequence of control commands is required to enable this option in the detector. To enable Level 6, the control panel needs to communicate to the device once with control bits 10 and 12 set to 00 followed by a single communication with control bits 10 and 12 set to 01, respectively. Once enabled, Level 6 can be disabled by repeating the above sequence. When enabled, PW2 will be three times PW1 for a single communication. When disabled, PW2 will be four times PW1 for a single communication. The status of the thermal alarm provision will be stored in EEPROM therefore the panel will not need to reconfigure the device ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 1:10

2 after power loss. Enabling this function will also enable a second maintenance alert level when the drift compensation has reached 80% of its limit. In this case a unique signal will be given in PW4. When Level 6 is enabled magnet alarm level is level 6. The sensor can provide the panel with the highest instantaneous value of the two thermistors. This is given by PW7 according to the following formula: PW7 = (T + 87) x 8 (see Figure 3), where T is the highest temperature (Celsius degrees) of the thermistors and units are microseconds. For example at 25 C, PW7 is about 896 s. This feature is factory programmable only. Environment temperature can be quite different from temperature detected by thermistors. The product includes six levels of alarm output in PW4. They do not necessarily have the same sensitivity associated with each level. The sixth level is used to indicate a heat alarm and will only be available if turned on by a special sequence of control. The alarm levels 1, 3, and 5 are fixed at 1%/ft, 2%/ft and 3.5%/ft. The levels 2 and 4 are variable. Level 2 between 1%/ft and 2%/ft and level 4 between 2%/ft and 3.5%/ft. The sensitivities of second and fourth levels are automatically adjusted to minimize the probability of false alarm due to adverse ambient conditions. The device accomplishes this by monitoring the ambient conditions for noise levels and becomes more sensitive if installed in a quiet location. If the location becomes noisy the sensitivity automatically decreases but will never become more insensitive than allowed by its approved range. The alarm levels are heavily processed with algorithms that minimize the effects of unwanted transient alarm sources while enhancing the response time to fast fires that produce sufficient temperature rise. They do this by monitoring not only the current value of the sensor but also trends in the signal such as increasing heat or decreasing photo signal. No processing is needed by the control panel. ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 2:10

3 SEPARATE OPERATION OF REMOTE LED This feature is enabled by a group command to non-existent address 253. With this group command, if all control bits are set to 0, then the detector accepts the command and redefines the action of the control bits on its normal polls, so that the LED and remote LED can be separately controlled. If the control bits are all 1, then the device reverts to the standard LED control method. For only the next poll afterwards to any device that has seen and accepted this group command, PW2 will be 6xPW1 indicating that the remote LED and LED are able to be separately controlled. When set to the standard LED control method, PW2 remains at 1xPW1. After the remote LED on command is first given, during the same poll, PW2 is 5xPW1. The priority of each of the different PWs where applicable and where they might be given simultaneously or in such a way to be contradictory are as follows: Highest 3xPW1-4xPW1-5xPW1-6xPW1-2xPW1-1xPW1 Lowest The status of the redefinition is lost when the device is powered off. On power up reset, the device goes to the standard LED control method. All three control bits (10, 11 and 12) are used for controlling the LEDs when they are in the separately controllable state. The generation of PW5 on sensors is normally controlled by control bit 11, but in this mode, PW5 is always transmitted during the PW5 window. The possible combinations of control sequence are as follows: CB10 CB11 CB12 LED Remote LED Remote Test ON ON# ON ON ON# No Change ON OFF@ ON ON OFF@ No Change OFF ON# No Change BLINK ON# OFF OFF OFF@ No Change BLINK BLINK OFF This change of state requires two consecutive This change of state requires two consecutive polls of remote LED off # This change of state requires two consecutive polls of remote LED on ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 3:10

4 VISIBILITY OF DRIFT COMPENSATION 2251TEM provides sensors the ability to last longer without cleaning by means of a drift compensation algorithm, which is based on the average photo chamber level compared with the current photo chamber level. In clean air, PW4 reflects the drift compensation status, with 800 s for 0%, and 1300 s for 100%. That means PW4 value rises, according to the amount of long-term chamber contamination until either the 80% drift level is reached, if this feature is enabled or until the 100% drift level is reached. While the detector is operating within the drift compensation range, the sensitivity to smoke is maintained. Changes in smoke level are not seen unless they are greater than the drift limit, ensuring that PW4 values within the drift compensation range can never occur due to smoke. When the detector has reached or exceeded the 100% drift compensation range, the sensitivity to smoke will increase steadily as the chamber becomes more contaminated. TERMINAL LAYOUT Refer to Intelligent Base Product Spec. S XX COMMUNICATION SPECIFICATIONS SPECIFICATION TYP MIN MAX UNIT COMMENTS Data Bit High Voltage Range (1) V Recommended Panel Design Range Data Bit Low Voltage Range (1) V Recommended Panel Design Range Bit Interval high Time (24V) s Bits 1-13: See Figure 1 Bit Interval low Time (0V, 5V) s Bits 1-13: See Figure 1 Software Reset Time s Minimum time to reset device (Figure 1) 1) All specifications refer to conditions at the detector head ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 4:10

5 ELECTRICAL SPECIFICATIONS SPECIFICATION TYP MIN MAX UNITS COMMENTS Communication Line Supply Range V DC Panel Voltage Output Driver Current (I f ) ma See Figure 2 Initial Output Driver Current (I o ) ma See Figure 2 Output Driver Transition Time s See Figure 2 Standby 24VDC Supply 250 A No Communication Standby 24VDC Supply 300 A Communication with LED blink enabled, once every 5s LED 24VDC Supply 7 ma Continuous Operation Current Supply Voltage to Guarantee LED on 16.5 V Initial Power Up Time 3 s Remote Output 24VDC Supply 22.5 V Remote Output 24VDC Supply 10.8 ma PW4 Stabilization Time 2 s Entering/Exiting Test Mode PW4 Update Frequency s ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 5:10

6 ENVIRONMENTAL SPECIFICATIONS SPECIFICATION TYP MIN MAX UNITS COMMENTS Humidity % RH Temperature C Air Velocity Pressure SENSITIVITY SPECIFICATIONS SPECIFICATION PRINT REFERENCE COMMENTS Smoke limits S XX Photo Static temperature limits S XX Thermal WAVEFORM QUANTITIES 3 BIT DEFINITIONS SENSOR PW DEFINITIONS BIT 1 SENSOR/MODULE SELECT PW1 REFERENCE BITS 2 5 HIGH ADDRESS CODE SWITCH BITS PW2 REMOTE TEST STATUS BITS 6 9 LOW ADDRESS CODE SWITCH BITS PW3 MANUFACTURER CODE BITS CONTROL BITS PW4 SENSITIVITY BIT 13 EVEN PARITY BIT PW5 TYPE IDENTIFICATION 3) See Figure 1 PW6 PW7 RAW CHAMBER VALUE (IF ENABLED) AVERAGE TEMPERATURE VALUE (IF ENABLED) ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 6:10

7 PW LIMITS (PW1 = 300 s) ABSOLUTE LIMITS (due to environmental/aging effects) MIN TYP MAX PW PW PW2 (RemoteTest) PW PW4 (Normal, clean) PW4 (Low Chamber Trouble / Thermistor Fault) PW4 (Maintenance Urgent / Drift Limit) PW4 (Maintenance Alert)* PW4 (Alarm 1) 1%/ft PW4 (Alarm 2) Adjusting 1% - 2%/ft PW4 (Alarm 3) 2%/ft PW4 (Alarm 4) Adjusting 2% - 3.5%/ft PW4 (Alarm 5) 3.5%/ft PW4 (Alarm 6 Heat / Magnet Test) * PW4 (Remote Test / Magnet Test) PW5 (Type ID) * If level 6 is enabled Note: All the limits are microseconds ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 7:10

8 DRIFT COMPENSATION CONSTANTS Clean Air Value 608 Drift Limit % Drift Limit (if function enabled) 717 Note: These constants are unprocessed raw chamber values available only from PW6 when this feature is factory enabled. All the limits are microseconds. ALARM TEST FEATURES APPLICABLE TEST METHODS COMMENTS Test Magnet Panel Remote Test Aerosol Heat Gun MECHANICAL SPECIFICATIONS SPECIFICATION TYP MIN MAX UNITS COMMENTS Wire Gauge for Screw Terminals Refer to intelligent base product spec. S XX Maximum Terminal Screw Torque Refer to intelligent base product spec. S XX Height 43 mm when used with a B501 base Length or Diameter 102 mm Weight 111 g ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 8:10

9 FIG. 1 - SERIAL COMMUNICATION WAVEFORM WITH QUANTITIES DEFINED Bit high Bit low Supply voltage Data bit high Data bit low PW1 PW2 PW3 PW4 PW5 Bit interval Software Reset Time FIG ma OUTPUT DRIVER SIGNALLING WAVEFORM FOR PULSE WIDTHS Io (ma) If (ma) I (ma) t (µs) Transition Time ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 9:10

10 PW7 = (T+87) x 8 PW7(us) T( C) FIG. 3 - PW7 vs. TEMPERATURE ED /03/05 PW TOLERANCE FROM 6.6% TO 5.0% E ECO NO. DESCRIPTION OF CHANGE CHG BY ISSUE.X +/-.XX +/-.XXX +/- HOLES +/- ANGLES +/- 10:10