GPS-iMEASURE-D Duct-Mounted Ion Measurement Device User Manual
- June 12, 2024
- GPS
Table of Contents
Installation, Operation & Maintenance Manual
GPS-measure-D
GPS-iMEASURE-D Duct-Mounted Ion Measurement Device
For technical product queries, please reach out to
techsupport@gpsair.com
Thank your purchasing the GPS-iMEASURE-D from GPS Air. 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
Equipment Provided by GPS:
- GPS-iMEASURE-D
- Pre-installed mounting bracket
- Transformer (APV 12-24) for input voltages 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
-
Prior to installation, ensure outer mesh is not in contact with inner tube. If necessary, adjust mesh accordingly.
-
Ensure housing is not grounded using the factory installed mounting bracket.
-
Select a location for installation. Find an area that will minimize, dust, dirt, and water.
The duct must be at least 11 inches deep. -
Cut or drill a 2-1/2-inch hole in the duct. Insert the GPS-iMEASURE-D into duct.
-
Secure the GPS-iMEASURE-D to the duct with field supplied screws.
-
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 units 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
Scale Selection
The scale on which the ions are read can be adjusted. To adjust the range
(sensitivity) of the GPS-iMEASURE-D, move the white jumper on the control
board.
- No Jumper = 10k ions/cc/sec (0V = 0 ions and 10V = 10k ions)
- Jumper on center and right pin position “A” = 100,000 ions/cc/ ions; 10V = 100k ions)
- Jumper on left and center pin position “B” = 1,000,000 ions (0V = = 1M ions)
Programming Note: If you don’t know what scale to use, start with the 10k ions/cc/sec scale.
If the output voltage stays near 10V on this scale, move the jumper to read 100k ions/cc.
If the output voltage stays near 10V on this scale, move the jumper to read maximum level of 1M ions/cc/sec.
Initial Power Up
Once power is applied, the GPS-iMEASURE-D will go through a 15 second
calibration cycle. During this time the LED will flash red or green (depending
on detection polarity) and, the output will go to 0VDC. The bi-color LED will
be solid red or green when power is applied and there are no faults.
Self-Test
Upon power up and once every hour the GPS-iMEASURE-D will perform a self-test.
During the self-test the device’s ion sensitivity is tested. During the self-
test the output levels are held at the pre-auto zero level. Upon a fault, the
LED will flash alternating red and green, and the output level will be pegged
at 10V (remote indication of error). The most common cause of an error is the
sensor is grounded in more than 1 location.
Indicators
- Dual color LED
- Blinking Green: Positive polarity self-test
- Solid Green: Positive polarity normal operation
- Blinking Red: Negative polarity self-test
- Solid Red: Negative polarity normal operation
- Alternating Green and Red: Self-test failure
Maintenance
Accumulation of lint and dust, spider webs or web fragments within the ion chamber can cause inaccurate readings, the inability to auto-zero or the ability to maintain a proper chamber voltage. This can usually be corrected by cleaning the chamber with canned compressed air. It is advisable to periodically blow out the chamber with compressed air. The frequency of this preventative procedure will depend on the environment in which it is used. Cleaning the unit/ chamber once a year will usually be sufficient in non- industrial environments.
Sensor Data Summary
- Voltage Input: 12-24V AC or DC, for units manufactured prior to 8/1/2020 with serial numbers up to 1500
- Voltage Input: 20-4-V AC or DC, for units manufactured on or after 8/1/2020 and with serial number beginning with 1500 and above.
- Current: 100mA
- Power: <2 watts
- Sensing Range (ions/cc): 0-10K, 0-100K, 0-1M
- Sensor Output: 0-10VDC
- Polarity Sensing: Positive or Negative, jumper controlled (a BMS can use a binary contact to change polarity remotely)
- Temperature Range: -20°F to 140°F
- Humidity Range: 0 to 99% RH, non-condensing
- Maximum impedance between pins 4 and 5 shall not exceed 1 kΩ.
Product Registration
By registering your order, the standard limited warranty on eligible products
from your purchase is automatically extended to 3 years, at no additional
cost.
Register your products at www.gpsair.com/product-
registration or scan the QR code.
The information provided in this manual is up to date at the time of printing. Any revisions to this document will supersede the content included. For the latest applicable version of this manual, visit our website or utilize the QR code.
https://qrco.de/iMEASURE-D-IOM
3101 Yorkmont Road • Suite 400
Charlotte, NC 28208
980-279-5622
To access a list of applicable patents, please visit www.gpspatents.com
GPS-041-20-R21-iMD IOM
© 2022 GPS Air
GPS Air is the owner of certain trademarks that appear in our materials.
Please visit www.gpsair.com/trademarks for
a list of our marks.
References
- GPS Air | Optimize Your Indoor Air Quality | GPS Air IAQ Solutions
- GPS Air | Product Registration
- GPS Air | trademarks
- Patents | Global Plasma Solutions