B-1
“Oil-Less” Scroll Laboratory Air
4107 9006 25.11
B.1 General Information
CAUTION:
This manual is designed to serve as
the operation and maintenance guide for your
Dew Point Transmitter, if equipped. The contents
of this manual should be carefully read BEFORE
attempting any phase of operation or maintenance.
Failure to follow the operating and maintenance
procedures of the instruction manual could result
in personal injury or property damage.
WARNING:
Before starting any installation,
maintenance or service procedure,
disconnect ALL power to the system to
prevent electrical shock.
Before making or breaking any gas line
connections, make sure the system is
depressurized in order to avoid personal
injury.
Before removing the dew point transmitter,
verify that the source of line pressure has
been closed and the line pressure reduced
to atmospheric pressure.
An alarm condition on dew point
indicates a dew point level exceeding the
maximum set point, or a faulty dew point
transmitter. Immediate action should be
taken to reduce the possibility of high
dew point in the Laboratory Air line.
If the dew point transmitter fl owmeter
becomes clogged, dew point readings
may be inaccurate, allowing moisture to
accumulate undetected.
B.2 Introduction
The dew point transmitter is a continuous, on-line
instrument that measures the absolute moisture
content in the fi nal air line. The transmitter
measures dew point with excellent long term
stability. The Advanced Ceramic Moisture sensor
is durable and has been designed for ruggedness
and simplicity. The transmitter is fully calibrated at
the factory prior to shipment.
B.3 Specifi cations
1. Dew point Temperature: -100° to 20°C (-148°
to 68°F)
2. Operating Temperature: 0° to 60°c (32° to
140°F)
3. Dew point accuracy: ±2°C (±3.6°F)
4. Air Consumption: 0.75 LPM (1.6 SCFH)
B.3.1 Output
Analog output: 4 - 20 mA
B.3.2 General
1. Operation Voltage: 12 - 28 VDC
2. Probe material: Stainless Steel (316)
3. Sensor protection: Ceramic
B.4 Operation
Although the correct operation of the transmitter
is not sample fl ow dependent, it is important that
fl ow velocity through the sample source to the
sample block is high enough to avoid long lead
time lags in response to changes in moisture at the
sample source.
Appendix B: Dew Point Transmitter
