Detcon IR-522 - Manual (Page 12)

A magnetic programming tool (see f igure 5) is used to operate the switches. Switch action is def ined as momentary
contact, 3 second hold, and 30 second hold. In momentary contact use, the programming magnet is waved over a
switch location. In 3 second hold, the programming magnet is held in place over a switch location for 3 or more
seconds. In 30 second hold, the programming magnet is held in place over a switch location for 30 or more sec-
onds. Three and thirty second hold is used to enter or exit calibration and program menus while momentary con-
tact is used to make adjustments. The location of “PGM 1” and “PGM 2” are shown in f igure 6.
NOTE: If, after entering the calibration or program menus, there is no interaction with the menu items for more
than 30 seconds, the sensor will return to its normal operating condition.
3.7 C ALIBRATION
Material Requirements
* Detcon PN 3270 MicroSafe™ Programming Magnet
* Detcon PN 6132 Threaded Calibration Adapter
* Span Gas containing the applicable calibration gas in air. Span gas concentration is recommended at 50% of
range (which is the factory default) at a controlled f low rate of 200 ml/min. Other concentrations can be used
as long as they fall within 10% to 90% of range. See section 3.7.2 for details.
3.7.1 Calibration Procedure - Zero
NOTE: Before performing a zero calibration, be sure there is no background target gas present.
a) Enter the calibration menu by holding the programming magnet stationary over “PGM 1” (see figure 6) for 3 sec-
onds until the display reads “1-ZERO 2-SPAN”, then withdraw the magnet. Note that the “CAL” LED is on.
b) Next, enter the zero menu by holding the magnet stationary over “PGM 1” for 3 seconds until the display
reads: “ZERO 0%”, then withdraw the magnet. The sensor has now entered the auto zero mode. When it is
complete the display will read “ZERO COMPLETE” for 5 seconds and then return to the normal operations
menu, “0 % LEL”.
NOTE 1: If the circuitry is unable to adjust the zero to the proper setting the sensor will enter a calibration
fault mode which will cause the display to alternate between the sensor’s current status reading and the calibra-
tion fault screen which appears as: “CAL FAULT” (see section 3.7.3).
Model IR-522 Combustible Hydrocarbon Sensor PG.12
Magnetic Programming Tool
Figure #5
detcon inc.
Program Switch #2
FLT CAL
MicroSafe™ LEL Gas Sensor
HOUSTON, TEXAS
PGM 2
PGM 1
MODEL IR-522
CONTRAST
Fault & Cal LEDs
Program Switch #1
Menu Driven Display
Plug-in Microprocessor Control Circuit
Display Contrast Adjust
Figure #6