Mounting the Probe
Probes are shipped loose. Do not misplace or damage the probe. The probe consists of more than 2/3 the
value of the unit. When a Powerloc is ordered with a dryer, a sample line for the probe is built into the dryer
outlet. When ordered for field installation, a sample line will be provided that must be installed in the piping
where it is desired to measure the dew point. A 1/2" NPT port is typically required.
The probe should be installed vertically with the sensing tip pointing down. Horizontal mounting is also
acceptable. Proper mounting will allow moisture to drip off the tip if a saturation condition occurs.
Mounting the probe directly in line could possibly cause damage.
Allow the dryer to cycle at least 3 times prior to installing the probe in order to avoid contamination by
desiccant dust. Open the isolation valve and purge the sample line of any collected desiccant dust. Use
caution as pressurized air and dust will then be expelled to atmosphere. Close the isolation valve and
install the probe. Insure that the tip of the probe does not touch the pipe wall. Adjust the ferrule to the
desired insertion length (do not tighten ferrule on the sensing tip) and tighten the compression fitting as
follows:
- Hand-tighten the nut.
- Then, using a wrench, tighten the nut one and one- half turns.
Slowly open the isolation valve to full open position. It is imperative that the isolation valve be fully open so
that the Powerloc reads pressure dew point. The sample line is fitted with coiled capillary tubing to control
the sample air flow. There must be continuous flow to obtain an accurate reading.
Following exposure of probe to line pressure, allow it to
stabilize
for 4 hours prior to connecting the probe
cable. Failure to do so may cause premature failure not covered by warranty.
Probe to Analyzer Connection
After 4 hours, connect the probe to the analyzer via the cable supplied.
The Powerloc ordered with a dryer will have the cable prewired to the analyzer. If the unit is being field
installed, pay close attention to the cable wire colors and make sure the cable shield is grounded. Refer to
applicable electrical.
Electrical Connection
No other connections are required for factory installed units.
For field installation refer to applicable drawings and make required power and control corrections. Note
that control wiring for units equipped with switching failure alarm is different than those not so equipped.
Dry contacts are provided for remote annunciation of High Humidity. A linear 4 to 20mA output is provided
for continuous monitoring of the dew point.
The instrument can now be turned on at any time. However, it should be noted that stable readings will occur
after the sample has come to equilibrium. This can take several hours to several days depending on the
moisture content of the flow, desiccant, piping and probe.
Troubleshooting
BLANK DISPLAY (with the power turned on) - this is an indication of a power line fault.
Check the power connection. If the display is still blank, the display is at fault. Consult the factory.
Probe Recalibration and Replacement
- The recommended calibration interval is one year to maintain accuracy (+/- 1%).
- Consult the factory for recalibration procedure.
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