Detcon DM-700 SIL 2 Safety Manual - Manual (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.
11 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.
Safety – Certified DM-700 gas detectors require additional Proof Testing to be performed in all cases.
Personnel performing Proof Test procedures shall be competent to perform the task. All proof test results must be
recorded and analyzed. Any corrective actions taken must be documented in the event that an error is found in the safety
functionality. The proof tests must be performed at a frequency as shown in Table 1.
Table 1: Frequency for Performing Proof Tests
DM-700 Proof Test Name Commissioning Frequency per year
Visual Field Inspection Proof Test Yes 2
Gas Response Proof Test Yes 2
Output Response Proof Test Yes 1
Warning:
Failure to perform the specified testing and inspection may lower or void the SIL rating for the product or
system.
12 VISUAL FIELD INSPECTION PROOF TEST
Tools Required: Programming magnet
Visual inspection of all Safety-Certified DM-700 Gas Detectors shall be conducted semi-annually to confirm that no
external blockage of gas/vapor path into the sensing chamber exists, ex. debris, trash, snow, mud, external equipment, etc.
Corrective action shall include removal of such impediments should they exist. All gas detectors must be inspected to
ensure that they are capable of providing expected performance and protection. The Model DM-700 provides a scrolling
LED display that indicates fault messages when operational parameters are abnormal. A momentary magnetic swipe
across either programming magnet will visually indicate any scrolling Fault Messages should any be present.
Completion of Visual Field Inspection Proof test will be recorded and documented in the SIS logbook.
13 GAS RESPONSE PROOF TEST
Tools Required:
50% of FS Range Span Calibration Gas Cylinder containing target gas in balance Air or N2
(concentration should be at least between 10% and 90% of FS Range)
Calibration Kit provided by Detcon
This proof test, commonly referred to as a “gas bump test”, requires application of high accuracy compressed calibration
gas to the detector while in NORMAL operational mode and inspecting the 4-20 mA signal output level to ensure that the
signal output is accurately indicative of the applied test gas concentration.