Det-Tronics OPECL Infrared Hydrocarbon Gas Detector - Manual (Page 37)

95-8556 10.1
Special Conditions for Safe Use for the [ib] HART communication port only:
• The intrinsically safe output on the HART Communicator Port is internally connected to frame.
• When connecting to a circuit using up to 1% of Co or Lo, then the C or L is limited to the Co and Lo listed above. If
either the C or L is above 1% of Co or Lo, then C or L are each limited to 50% of the Co or Lo listed above.
• Um is restricted to 250 V, prospective short circuit current < 1500 A.
• The Infrared Hydrocarbon Gas Detectors shall be powered from a SELV isolating transformer and the fuse for Isc
shall be of the type complying with IEC60127.
WARNING
Always ensure that the detector/junction box hazardous (classified) location ratings are applicable for the
intended use.
Additional Safety Notes:
• For ambient temperatures below –10°C, use field wiring suitable for the expected conditions, and for ambient
temperatures above +60°C, use field wiring suitable for 20°C above the maximum expected conditions.
AccurAcy (per IEC 60079-29-4)
4-20 mA Model: ±0.25 LFL-meters or ±12.4% of applied gas concentration, whichever is greater, with water
vapor @ ≥82°C.
EQP Model: ±0.25 LFL-meters or ±15.2% of applied gas concentration, whichever is greater, @ –55°C.
response tiMe
4-20 mA Model
T50: 1.2 seconds (2.5 LFL-meters applied)
T90: 2.5 seconds (2.5 LFL-meters applied).
EQP Model
T90: 5.3 seconds* (2.5 LFL-meters applied).
* For EQP model only, average of three consecutive trials, with the minimum and maximum response times no
greater than ±2 seconds from the average indicated response time.
AlignMent
Misalignment will cause the manufacturer stated accuracy limits to increase, but remain within the limits of
IEC 60079-29-4.
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