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SAFETY CERTIFIED MODEL DM-700 TOXIC GAS DETECTOR
This manual addresses the specific requirements and recommendations applicable to the proper installation, operation, and
maintenance of all Safety-Certified (SIL-Certified) DM-700 sensors. For complete information regarding performance,
installation, operation, maintenance and specifications of the Model DM-700, refer to instruction manual Document
#3207.
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SAFETY MESSAGES
Procedures and instructions in this section may require special precautions to ensure the safety of personnel performing
the operations. Information that raises potential safety issues is indicated by the word "Warning". Always read and
understand these safety messages.
Warning:
The DM-700 Gas Detector is intended for use in hazardous environments that may include dangerous levels of toxic gas
vapors. This product must be properly installed, operated and maintained. Improper installation or use could result in
death or serious injury.
If applicable, do not remove the XP Junction box cover in explosive environments when device power is on and circuits
are live.
Detector must be properly installed, and XP junction box cover must be fully engaged to meet hazardous area explosion-
proof/non-incendive requirements.
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DESIGN
The Model DM-700 is an electrochemical type toxic gas detector that is classified as a Type B smart device according to
IEC61508. The DM-700 sensor provides a 4-20 mA output that is proportional to toxic gas vapor concentrations in the
ranges of 0-1 ppm up to 0-10000 ppm. The DM-700 contains extensive self-diagnostics and is programmed to send the
SAFETY MANUAL
SIL 2 Certified Model DM-700 Toxic Gas Sensor
Version 3.0
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Summary of Contents for Detcon DM-700
- Page 1 DESIGN The Model DM-700 is an electrochemical type toxic gas detector that is classified as a Type B smart device according to IEC61508. The DM-700 sensor provides a 4-20 mA output that is proportional to toxic gas vapor concentrations in the...
- Page 2 VALID INPUT RANGE DM-700 fault annunciation is provided on the 4-20mA signal output loop by signaling to 0mA current output level for at least 5 seconds. The receiving device must be programmed to indicate an out-of-range condition when current levels reach overcurrent (>21.5 mA) or undercurrent (<1.8 mA).
- Page 3 4-20mA output. After the DM-700 has been off power for more than 24 hours, it shall be allowed a 1 hour start-up period before performing its safety function When the DM-700 detects a fault condition it will drive the output to 0mA for at least 5 seconds.
- Page 4 Any configuration changes to the DM-700 require the use of the Detcon programming magnet. This programming magnet is the only security measure used to prevent unauthorized changes to the DM-700 configuration. OPERATION, MAINTENANCE, INSPECTION AND PROOF TESTING All normal installation, start-up, and full field calibration recommendations as documented in the DM-700 instruction manual are applicable to the Safety Certified DM-700 gas detector.
- Page 5 Full Calibration shall be conducted when required. The procedure for performing the Full Calibration is in the Calibration section of the DM-700 instruction manual. In all cases the model DM-700 gas detector should be allowed to warm up for 5 minutes before conducting a Full Calibration.
- Page 6 The Safety-Certified DM-700 product versions fully comply with, and must be operated in accordance with the functional, environmental, and performance specifications provided in the DM-700 instruction manual. A 24 hour mean time to repair should be assumed for safety availability calculations. All DM-700 diagnostics have a maximum 1 hour test interval.