Detcon TP-524C - Manual (Page 7)

Calibration mode allows for sensor span adjustments. Unless otherwise specif ied, span adjustment is performed at
10 ppm H2S in air for the range 0-20 ppm, and 25 ppm H2S in air for the ranges 0-50 ppm and 0-100 ppm.
“AUTO SPAN”
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
Detcon Model TP-524C Hydrogen Sulfide Sensor PG.7