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Summary of Contents for PST Dynament Axiom A2L
- Page 1 AXIOM A2L DETECTOR USER MANUAL Dynament Limited Hermitage Lane Industrial Estate ٠ Kings Mill Way ٠ Mansfield ٠ Nottinghamshire ٠ NG18 5ER ٠ UK. Tel: 44 (0)1623 663636 ٠ email: sales@dynament.com www.dynament.com TDS 0033 Issue 1.1 23/08/2024 Change Note: 781 Page 1 of 15...
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Page 2: Table Of Contents
Contents Safety Information – Read First Axiom A2L Detector Description Power Supply Detector Mounting Detector warm-up Serial communications Logic levels MODBUS Gas Reading Protocol Analogue output 4-20mA Mode 0.2-4.0V Mode Response Times Fault indication Voltage output 4-20mA Serial Data Calibration Pressure dependency Maintenance Handling precautions... -
Page 3: Safety Information - Read First
Safety Information – Read First Read and understand this manual in conjunction with the relevant data sheet before using the Axiom detector. This is not an Intrinsically Safe or Ex Flameproof device. Axiom A2L Detector Description Dynament infrared detectors operate by using the NDIR (Non-Dispersive Infra Red) principle to monitor the presence of the target gas. -
Page 4: Detector Warm-Up
Detector warm-up The detector takes approximately 45 seconds to warm up after power is supplied. The detector is held at -250% of the full-scale output during this time. In 4-20mA mode, the output will be forced to 2.5mA and the Open Collector Output will be active during this time. In 0.2-4.0V mode, the output will be 0V and the Open Collector output will be active during this time. -
Page 5: Modbus Gas Reading Protocol
MODBUS Gas Reading Protocol The sensor can be interrogated (when the output mode is set to RS232 or RS485 serial communications) using the industry standard MODBUS protocol. The simplest use of this protocol is to read the gas measurement. The message below is a MODBUS data packet that can be used request this information from a sensor. -
Page 6: Analogue Output
Analogue output The analogue output of the detector is proportional to the measured gas level. The analogue output can be configured to be a 4-20mA or a 0.2-4.0V configuration. This configuration is carried out during manufacture and cannot be changed afterwards. 4-20mA Mode The analogue output range is 4mA to 20mA for zero gas to FSD. -
Page 7: Response Times
Response Times Axiom conforms to the UL60335-2-4, annex LL specification for response time with a recorded value of <15s Fault indication The analogue output is driven to the fault level when an internal fault is detected. Voltage output The 0.2-4.0V output will be driven to 0V in the event of a fault. 4-20mA The 4-20mA output will be driven to 2.5mA in the event of a fault. -
Page 8: Calibration
Calibration Axiom A2L detectors do not require field calibration. Pressure dependency NDIR gas detectors exhibit a dependency on the pressure conditions under which they operate. The principle of operation is based upon the absorption of infrared energy by molecules of the target gas within the detector. -
Page 9: Warranty
Warranty Infrared detector warranty and lifetime are given in the detector data sheet, a typical statement is as follows: All Dynament Axiom detectors carry a five-year warranty against defects in materials and workmanship. The warranty is invalidated if the detectors are used under conditions other than those specified in the relevant data sheet. -
Page 10: Appendix
Appendix Wiring Guide Axiom can be factory configured in 4 different output modes: When a bare ended USB cable used, the contacts follow the colour code below: Colour Axiom Contact 5-24V DC White Green Black TDS 0033 Issue 1.1 23/08/2024 Change Note: 781 Page 10 of 15... -
Page 11: 4-20Ma
4-20mA EM U Connection Function 5.0 – 24V Input 4-20mA Output with fault indication (2.0mA = Fault) 100R Recommended Load Resistor Open Collector Output Active Low 100mA maximum load 5.5V maximum voltage System 0V Recommended Output Circuits 4-20mA Open Collector TDS 0033 Issue 1.1 23/08/2024... -
Page 12: 0.2-4.0V
0.2-4.0V Connection Function 5.0 – 24V Input 0.2-4.0V Output (0.1V minimum) Open Collector Output Active Low 100mA maximum load 5.5V maximum voltage System 0V Recommended Output Circuit 0.2-4.0V Open Collector TDS 0033 Issue 1.1 23/08/2024 Change Note: 781 Page 12 of 15... -
Page 13: Rs485
RS485 EM U Connection Function 5.0 – 24V Input RS485 A RS485 B System 0V Recommended Output Circuit TDS 0033 Issue 1.1 23/08/2024 Change Note: 781 Page 13 of 15... -
Page 14: Rs232 (Ttl)
RS232 (TTL) EM U Connection Function 5.0 – 24V Input RS232 Tx 3.3V TTL RS232 Rx 3.3V TTL System 0V Recommended Output Circuit TDS 0033 Issue 1.1 23/08/2024 Change Note: 781 Page 14 of 15... -
Page 15: Using The Open Collector Output To Drive A Relay
Using the Open Collector Output to Drive a Relay Axiom’s Open Collector output can be used to drive a relay when connected as shown below. To do this, use the connect the relay coil between the Open Collector output (D-) and a 5V supply. On alarm or fault the Open collector output will be driven low, completing the circuit through the coil, and energising the relay.
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