Edgetech COM.AIR Operator's Manual
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COM.AIR
Dew Point Monitor
Model COM.AIR
Compressed Air Dew Point Monitor
OPERATORS MANUAL
Edgetech Instruments Inc. 399River Rd, Hudson, MA 01749
508-263-5900 www.edgetechinstruments.com
04/02/2015 Rev. B
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TABLE OF CONTENTS
1.0 GENERAL DESCRIPTION
2.0 INSTALLATION
2.1 MOUNTING
2.2 WIRING CONNECTIONS
2.3 SAMPLE CONNECTIONS
2.4 ALARM RELAY CONNECTIONS
2.5 ANALOG OUTPUT CONNECTIONS
2.6 RS-232 SERIAL
COM.AIR
Dew Point Monitor
3.0 FUNCTIONAL DESCRIPTION
3.1 DISPLAY
3.2 MABC BUTTON
3.3 SILENCE ALARM BUTTON
3.4 FLOW CONTROL VALVE
3.5 ALARM RELAY OUTPUT
3.6 ANALOG OUTPUT
4.0 SETUP
4.1 ALARM SET POINT
4.2 ABC INTERVAL
5.0 MAINTENANCE
5.1 ROUTINE MAINTENANCE
5.2 MIRROR CLEANING SCHEDULE
5.3 MIRROR CLEANING PROCEDURE
6.0 SPECIFICATIONS
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COM.AIR
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Dew Point Monitor
Edgetech Instruments Inc.'s Commitment to Quality
To Our Customers:
Thank you for purchasing one of our products. At Edgetech Instruments, it is our policy to
provide cost-effective products and support services that meet or exceed your requirements,
to deliver them on time, and to continuously look for ways to improve both. We all take pride
in the products we manufacture.
We want you to be entirely satisfied with your instrument. The information in this manual will
get you started. It tells you what you need to get your equipment up and running, and
introduces its many features.
We always enjoy hearing from the people who use our products. Your experience with our
products is an invaluable source of information that we can use to continuously improve
what we manufacture. We encourage you to contact or visit us to discuss any issues
whatsoever that relates to our products or your application.
Edgetech Instruments is proud that our Com Air range is made here in the USA.
The Employees of Edgetech Instruments Inc.
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Dew Point Monitor
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1.0 GENERAL DESCRIPTION
The Edgetech Instruments Model COM.AIR is a chilled mirror based hygrometer designed
especially to monitor the dew point in compressed air systems.
It is an integrated system including a microprocessor-based instrument, a chilled mirror dew
point sensor, a sample flow meter and valve, and associated tubing and fittings.
The wall mount enclosure is easily mounted to any vertical surface.
The Instrument includes:
An eight-digit, alphanumeric, LED display to report the dew point and system status.
Periodic sensor balance check.
Programmable Alarm Set Point with visual, audible, and contact closure alarm indications.
A SPDT (Form C) Alarm Relay.
A 4 to 20mA analog output.
2.0 INSTALLATION
2.1 MOUNTING
The COM.AIR can be installed on any flat vertical surface with four ¼ inch screws. See Figure
2-1 for dimensional information.
COM.AIR
2.2 WIRING CONNECTIONS
The COM.AIR is designed to operate on AC voltages of 90 to 260 VAC with a maximum power
requirement of 40 Watts. The power entrance hole, located on the bottom of the enclosure, is
designed to accept a standard conduit, clamp type fitting or a compression type fitting
(supplied). The power line connections to the instrument are made using pigtail leads and wire
nuts.
Connect the power leads as follows:
1. Remove the three thumbscrews and the access cover as shown in Figure 2-2
2. Pull the three wires, black, white and green out of the wire box as shown in
Figure 2-3.
3. Insert the power line wires into the bottom of the enclosure and feed them up
through the wire box and out the access opening. Strip the wire ends back about
½". Using the three wire nuts, connect the wires black to black, white to white
and green to green. Tighten the wire nuts securely, making sure there are no
exposed wires.
4. Push the wires down into the wire box.
2.3 SAMPLE CONNECTIONS
The sample may be brought to the instrument with ¼" copper, stainless steel, or plastic tubing
and terminated in a ¼" female fitting.
Connect the sample supply line to the ¼" tubing fitting located on the top of the sensor. The
return line connect to the 1/4'” female fitting on the top of the enclosure Figure 2.2).
NOTE: The maximum inlet pressure is 150 PSIG.
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2.4 ALARM RELAY CONNECTIONS
When the programmed Alarm Set Point is exceeded, the alarm relay will be energized. Before
connecting any device to the Alarm Relay contacts, check the contact ratings in the
Specifications section.
1. Remove the Access Panel as in Figure 2-2.
2. Referring to Figure 2-3, feed the wires to be connected to the relay through the “signals out”
fitting on the bottom of the enclosure and up to the PCB connector, marked P2, “ALARM
RELAY”.
NOTE: To connect a wire to the terminal, loosen the screw, insert the wire in the
opening, and tighten the screw.
3. Connect one of the signal wires to the CA (Center Arm) and the other wire to either the NO
(Normally Open) or NC (Normally Closed) terminal.
4. Replace the Access Cover.
2.5 ANALOG OUTPUT CONNECTIONS
1. Remove the Access Panel as in Figure 2-2.
2. Referring to Figure 2-3, feed the wires to be connected to the analog output through the
‘signals out’ fitting on the bottom of the enclosure and up to the PCB connector, P1, “4-20mA
out”.
NOTE: To connect a wire to the terminal, loosen the screw, insert the wire in the opening,
and tighten the screw.
3. Connect the high signal wire to the “+” terminal and the low side to the “-“ terminal.
4. Replace the Access Cover.
COM.AIR
2.6 RS232 SERIAL(Optional)
1. For hygrometers equipped with optional RS232 only. The RS232 is 2 wire, Simplex,
RS232 serial output, data is transmitted at an interval of 1/sec, and is space delimited.
The BAUD rate is fixed at 19.2kbps. The protocol is N81(No Parity, 8 data bits, 1 stop
bit). The parameter sequence is “dew point ABC status.” (example:”xx.xC(or F)””
“’ABC on”)
2. For RS232 output connect to P11-1 for LO(-) and P11-2 for HI(+) located on the small
Pressure X-Ducer input/ Analog output/ RS232 PCB which is mounted parallel to the
main PCB.
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COM.AIR
Dew Point Monitor
FIGURE 2-1 MOUNTING
04/02/2015 Rev. B
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