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Thank your choosing the GPS-iMEASURE-D. The GPS-iMEASURE-D ion detector is permanently mounted in the duct or
inside an air handling system downstream of any GPS ionization device.
Equipment Provided by GPS:
• GPS-iMEASURE-D
• Pre-installed mounting bracket
• Transformer (APV 12-24) for input voltages 100-240V
Hardware Required by Installer
• #10 x 1” Self-tapping sheet metal screws
• Electrical connectors
• 18/5 shielded cable
• 24V power supply (voltage supplied must be floating) for input voltages other than 100-240V
Installation Location
GPS recommends the GPS-iMEASURE-D be installed on or in the duct downstream of the ionizer, away from extreme
heat and condensation. Mount in location with minimal turbulence. The unit should be mounted prior to the first
take-off if any exists. Unit should be mounted at or near the same elevation as the ionization device for more accurate
readings.
Mechanical Installation
1. Prior to installation, ensure outer mesh is not in contact with inner tube. If necessary,
adjust mesh accordingly.
2. Ensure housing is not grounded using the factory installed mounting bracket.
3. Select a location for installation. Find an area that will minimize, dust, dirt, and water. The duct must be at
least 11 inches deep.
4. Cut or drill a 2-1/2-inch hole in the duct. Insert the GPS-iMEASURE-D into duct.
5. Secure the GPS-iMEASURE-D to the duct with field supplied screws.
6. In larger air handlers, the GPS-iMEASURE-D may be mounted entirely in the airstream
Electrical Installation
CAUTION: MAKE SURE POWER IS DISCONNCTED FROM HVAC EQUIPMENT BEFORE
INSTALLATION
• Verify voltage of circuit the GPS-iMEASURE-D will be connected.
INPUT VOLTAGE RANGE 20-40 VAC or VDC
NOTE: All units manufactured on or after 8/1/2020 will accept 20-40 VAC or VDC. This
includes all uits with serial number beginning with 1500 and above.
NOTE: If wire connected to pin 4 is not grounded, the housing of the iMEASURE-D must be
grounded.
• If using the included APV 12-24 transformer, connect APV 12-24 Blue and Brown wires to line voltage, and
connect APV 12-24 Red and Black wires to Pins 1 and 2 on the GPS-iMEASURE-D.
• Wire the GPS-iMEASURE-D per the following (see FIGURE 1):
Pin 1= input voltage (not polarity sensitive)
Pin 2= input voltage (not polarity sensitive)
Pin 3= Polarity selection: No connection (floating)= detects positive ion
Connected to pin 4 = detects negative ions
Pin 4= Output Return or reference/ground reference
Pin 5= Output to BMS 0VDC to +10VDC
Figure 1
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