Figure #4 – Detcon IR-522 User Manual
Page 11
3.6 S
TART
U
P
Upon completion of all mechanical mounting and termination of all f ield wiring, apply system power and observe
the following normal conditions:
a)
IR-522 “Fault” LED is off.
b)
A reading of 0% LEL should be indicated upon conclusion of a 12 second “warming up” cycle.
Note 1: If the display contrast needs adjustment, refer to section 3.10.
3.6.1 Initial Operational Tests
After a warm up period has been allowed for, the sensor should be checked to verify sensitivity to combustible
hydrocarbon gas.
Material Requirements
*
Span Gas 50% LEL methane in air at a controlled f low rate between 200 ml/min.
NOTE: If the sensor has been conf igured for calibration with a gas other than methane you will need to use
that gas. See section 3.7 for further information on calibration gas.
a)
Attach the calibration adapter to the threaded sensor housing. Apply a the test gas at a controlled f low rate of
500 to 1,000 ml/m. Observe that the LCD display increases to a level of 20% or higher.
b)
Remove the test gas and observe that the LCD display decreases to
“0 % LEL”.
Initial operational tests are complete. Detcon combustible gas sensors are pre-calibrated prior to shipment and will,
in most cases, not require signif icant adjustment on start up. However, it is recommended that a complete calibra-
tion test and adjustment be performed within 24 hours of installation. Refer to calibration instructions in later text.
3.6.2 Programming Magnet Operating Instructions
Operator interface to MicroSafe™ gas detection products is via magnetic switches located behind the transmitter
face plate. DO NOT remove the glass lens cover to calibrate or change programming parameters. Two switches
labeled “PGM 1” and “PGM 2” allow for complete calibration and alarm level programming without removing the
enclosure cover, thereby eliminating the need for area de-classif ication or the use of hot permits.
Model IR-522 Combustible Hydrocarbon Sensor PG.11
1 2 3 4
R
E
D
B
R
N
W
H
T
B
LK
Remote Transmitter
IR-522-RT
Remote Sensor
IR-522-RS
WHT
BLK
YEL
BLU
RED
BRN
5 6
Y
E
L
B
LU
Figure #4