Manual

labeled “PGM 1” and “PGM 2” allow for complete calibration and programming without removing the enclosure
cover, thereby eliminating the need for area de-classification or the use of hot permits.
A magnetic programming tool (see figure 5) is used to operate the switches. Switch action is defined 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 figure 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 TARGET GAS AND CALIBRATION GAS SELECTION
Because of the catalytic detector elements almost universal response to lower explosive limits of combustible gas,
the FP-524C sensor can be configured to specifically detect any of the combustible gases listed in table 1. This spe-
cific gas is referred to as the “target gas”. In addition, the sensor can be configured so that it can be calibrated with
any of the listed gases, regardless of which target gas is selected. This gas is referred to as the “calibration gas”. These
two features allow a significant degree of flexibility in the detection and calibration process.
Unless otherwise specified at time of order, Model FP-524C combustible gas sensors are configured to detect
methane gas in the range 0-100% LEL and are calibrated with 50% LEL methane in air. In this configuration,
methane is chosen as both the target gas and the calibration gas.
CAUTION:
Verification of specific target gas and calibration gas settings is required before commissioning.
To verify target gas and calibration gas settings, or to reconfigure the target gas or calibration gas, follow the
instructions below.
3.7.1 The “K” Factor
Most detectable gases, as listed in table 1, produce a similar output, however the signal amplitudes will differ. This
difference in amplitude is reflected by a numeric figure known as a “K factor”. The K factors are referenced to
methane which has a K factor of 1.00. It should be noted that these factors are theoretical and should only be used
as a guide to the response expected from other gases.
Model FP-524C Combustible Gas Sensor PG.12
Magnetic Programming Tool
Figure #5
detcon inc.
Program Switch #2
FLT CAL
MicroSafe™ LEL Gas Sensor
HO USTON, TE XAS
PGM 2
PGM 1
MODEL FP-524C
C
ONTRAST
Fault & Cal LEDs
Program Switch #1
Menu Driven Display
Plug-in Microprocessor Control Circuit
Display Contrast Adjust
Figure #6