3.4.3 Program Mode
The program mode provides a program status menu (View Program Status) to check operational parameters. It also
allows for the adjustment of the calibration gas level setting, the heater voltage level, range, and linearity correction.
3.4.3.1 Program Status
The program status scrolls through a menu that displays:
* The gas type, range of detection and software version number. The menu item appears as:
“H2S 0-100 V#.#”
* The calibration gas level setting. The menu item appears as:
“CalLevel @ ##PPM”
* The sensor heater voltage setting. The menu item appears as:
“HEATER @ #.##VDC”
* The range of detection setting. The menu item appears as:
“RANGE @ 0-###PPM”
* The estimated remaining sensor life. The menu item appears as:
“SENSOR LIFE 100%”
* The raw resistance of the sensor f ilm. The menu item appears as
“RESISTANCE = XX”
(in ohms)
3.4.3.2 Set Cal Level Adjustment
The Calibration level is adjustable from 10% to 50% of full-scale range. The menu item appears as:
“CalLevel @ ##PPM”
3.4.3.3 Set Heater Level Adjustment
The Heater Level is adjustable from 4.40 to 5.40 vdc (normally 5.25). The menu item appears as:
“Heater @ #.## vdc”
3.4.3.4 Set Range
The full-scale range is adjustable between 0-20 ppm, 0-50 ppm and 0-100 ppm The item appears as:
“Range @ 0-### ppm”
3.4.3.5 Utility Menu
“Set X Value” is an adjustment for linearization (factory setting only!)
“Set Filter Mode” is a selection of f iltering modes (factory setting only!)
3.5 I
NSTALLATION
Optimum performance of ambient air/gas sensor devices is directly relative to proper location and installation practice.
3.5.1 Field Wiring Table
(4-20 mA output)
Detcon Model TP-524C solid state H2S sensor assemblies require three conductor connection between power sup-
plies and host electronic controllers. Wiring designators are
+
(DC),
–
(DC) , and
mA
(sensor signal). Maximum
single conductor resistance between sensor and controller is 10 ohms. Maximum wire size for termination in the
sensor assembly terminal board is 14 gauge.
AWG
Meters
Feet
20
240
800
18
360
1200
16
600
2000
14
900
3000
Note 1:
This wiring table is based on stranded tinned copper wire and is designed to serve as a reference only.
Note 2:
Shielded cable may be required in installations where cable trays or conduit runs include high voltage
lines or other sources of induced interference.
Note 3:
The supply of power must be from an isolating source with over-current protection as follows:
AWG
Over-current Protection
AWG
Over-current Protection
22
3A
16
10A
20
5A
14
20A
18
7A
12
25A
3.5.2 Sensor Location
Selection of sensor location is critical to the overall safe performance of the product. Five factors play an important
role in selection of sensor locations:
Detcon Model TP-524C Hydrogen Sulfide Sensor
PG.7
