Model TP-524D
TP-524D Instruction Manual
Rev. 0.8
Page 10 of 37
d)
Plug the Transmitter Module into the connector PCB and replace the junction box cover.
NOTE
: A 6-32 or 8-32 threaded exterior ground point is provided on most junction boxes for
an external ground. If the Sensor Assembly is not mechanically grounded, an external ground
strap
must
be used to ensure that the sensor is electrically grounded.
2.7
Initial Start Up
Upon completion of all mechanical mounting and termination of all field wiring, apply system power 24VDC
(typical) and observe the following normal conditions:
a)
TP-524D display reads “0”, and no fault messages are flashing.
b)
A temporary upscale reading may occur as the sensor heats up. This upscale reading will decrease to “0”
ppm within 1-2 minutes of power-up, assuming there is no gas in the area of the sensor.
NOTE
: The 4-20mA signal is held constant at 4mA for the first two minutes after power up.
c)
Remove the desiccant cap about 10 minutes after applying power to the sensor and install the
weatherproof splashguard accessory supplied with the sensor.
NOTE:
A desiccant cap with a desiccant packet is attached to the sensor cell housing to avoid
damage during storage and shipping. This prevents water from contacting the sensor film, and
as a result helps to retain the stability of the factory span calibration.
IMPORTANT NOTE: Do not remove the desiccant cap and cover until power is applied to
the sensor. Store the desiccant caps with the desiccant packets in a sealed container (i.e. zip-
lock Bag) for future use. It is mandatory to reinstall the desiccant cap and packet during any
periods without power lasting more than 1 hour. An active desiccant packet is blue in color
and turns pink when consumed. (re-order P/N 960-240010-000). Do not use the desiccant
packet if it is pink in color, order new packets as required.
Initial Operational Tests
After a warm up period of 1 hour, the sensor should be checked to verify sensitivity to H
2
S gas.
Material Requirements
-Detcon PN 600-610000-000 Splash Guard with integral Cal Port -OR-
-Detcon PN 943-000006-038 Threaded Calibration Adapter
-Detcon PN 942-010112-025 Span Gas; 25ppm H
2
S in balance Air at fixed flow rate between 200 - 500cc/min
(10ppm for 0-20ppm range)
-Detcon PN 985-241100-321 In-Line Humidifying Tube
NOTE
: Do not use H
2
S in Nitrogen background gas mixtures. This will cause significant
reading inaccuracies.
a)
Connect the In-Line Humidifying Tube between the cal gas cylinder and the sensor. The humidifying tube
will introduce the ambient relative humidity into the Cal Gas as it passes through the tube.
