onds. Three and f ifteen 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.
3.6.4 Setting Range
Detcon Model TP-524C can be programmed to operate in one of three ranges of detection: 0-20 ppm, 0-50 ppm, or
0-100 ppm. To determine the current range setting follow the instructions given in section 3.8.
To change the range of detection follow the instructions below:
a)
First, enter the programming menu by holding the programming magnet stationary over “PGM 2” for 15 sec-
onds until the display reads
“VIEW PROG STATUS”
, then withdraw the magnet. At this point you can
scroll through the programming menu by momentarily waving the programming magnet over “PGM 1” or
“PGM 2”. The menu options are: View Program Status, Set Cal Level, Set Heater Volts, Set Range, and Linearize
Sensor.
b)
Next, scroll to the
“SET RANGE”
listing and then hold the programming magnet over “PGM 1” for 3 sec-
onds. The menu appears as
“Range @ 0-### ppm”
listing.
c)
Use the programming magnet to make an adjustment to “PGM 1” to increase or “PGM 2” to decrease the read-
ing to the desired range.
d)
Exit to the programming menu by holding the programming magnet over “PGM1” for 3 seconds, or automati-
cally return to the programming menu in 30 seconds.
e)
Exit back to normal operation by holding the programming magnet over “PGM 2” for 3 seconds, or automati-
cally return to normal operation in 30 seconds.
NOTE: When switching between ranges, remember to readjust your Cal Level setting if necessary (see section 3.7.2).
3.6.5 Setting Heater Voltage
The Detcon TP524C H2S sensor is factory set for the correct heater voltage and should be ready to install without
further adjustment being required. The correct heater voltage for the sensor is 5.25 VDC when set at 25°C room
temperature. It is not normally necessary to adjust this heater voltage unless 1) the sensor is going to be used in
the remote mount format or 2) the sensor is being swapped out with a new replacement sensor.
If the user needs to adjust the heater voltage due to the above-mentioned conditions, it is necessary to make the
adjustment based on the current ambient temperature condition. Refer to the table below for guidance on proper
heater voltage set-point:
Ambient Temp
Heater Voltage Set-point
25°C
5.25 VDC
35°C
5.18 VDC
45°C
5.10 VDC
55°C
5.00 VDC
15°C
5.32 VDC
5°C
5.39 VDC
-5°C
5.45 VDC
-15°C
5.50 VDC
-25°C
5.55 VDC
-40°C
5.60 VDC
3.6.6 Utility Menu
The Utility Menu is used for factory authorized adjustments related to linearization and f ilter mode. It should not
be used by the end-user in the f ield.
The “Set X Value” menu is used for adjustments of the linearization coeff icient. This is a factory authorized adjust-
ment. The default setting is “6.0”.
Detcon Model TP-524C Hydrogen Sulfide Sensor
PG.12
