Distech Controls GS-AQOPM Series User manual

Installation Guide
Product Description
The Outside Particular Matter Sensor uses an optical sensor based on laser scattering principles and features innovative
contaminationresistance technology to perform highly accurate and reliable PM measurements. With a continuous-oper-
ation lifetime of more than 8 years, the sensor will provide long-term reliability and high-resolution particle size binning for
the detection of environmental dust and other particles.
The sensor is housed within a weatherproof enclosure to monitor outside PM levels. The sensor achieves excellent per-
formance characteristics, including high accuracy and low power consumption to ensure stable long-term operation. The
outside particulate sensor features both 4-20 mA and voltage outputs (0-5 / 0-10 Vdc) for simple integration into any build-
ing automation system to assure good air quality. The device is also available with an RS-485 MS/TP network connection
including either Modbus or BACnet®protocol.
General Installation Recommendations
Use electrostatic discharge precautions during installation and do not exceed the device ratings.
Read these installation instructions carefully before commissioning the PM Sensor.
Failure to follow these instructions may result in product damage.
Do not use in an explosive or hazardous environment, with combustible or ammable gases, as safety or emergency
stop devices or in any other application where failure of the product could result in personal injury.
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Device Information
Mounting Instructions
Select a suitable mounting spot on an exterior wall where the sensor
is best protected from direct exposure to sunlight, wind, etc. preferably
on a north facing wall. Do not mount the sensor near opening windows,
supply/exhaust air louvres or other known air disturbances. Avoid areas
where the sensor is exposed to vibrations or rapid temperature chang-
es. It is recommended that the enclosure be mounted so conduit or ca-
ble-gland connections be made on the bottom of the enclosure. See
Figure 1.
Remove the cover by using a standard or Phillips screwdriver to loosen
the four screws as shown in Figure 2. As the screws are captive type,
complete removal of the screw from the cover is not required.
Install a conduit connector or cable gland as shown in Figure 3. It is
recommended that weatherproof conduit or cable gland ttings be used.
The outside mount particulate sensor installs directly on an exterior wall
using the four integrated mounting holes provided on the enclosure. See
gure 4.
Select the best mounting technique based on the exterior wall materi-
al. The 4 mounting holes will facilitate a #10 size screw (not supplied).
Mount the base by screwing directly to the wall. After the base is secure-
ly fastened to the exterior wall, connect conduit to conduit connector or
feed cable through the cable gland and tighten. Make wire connections
as per the “Wiring” illustrations. Once wiring and set up are complete,
re-install cover and secure by tightening the four screws using a at
screwdriver. See Figure 5.

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Wiring Instructions
The sensor has standard screw block connectors and easy wire access to facilitate wiring. It is recommended that
shielded twisted pair wiring at least 22 AWG be used for all connections and that the device wires not be run in the
same conduit with wiring used to supply inductive loads such as motors. Disconnect the power supply before making
any connections to prevent electrical shock or equipment damage. Make all connections in accordance with national
and local electrical codes.
The device should be connected to a 24Vac/dc, class 2 power supply. The PWR terminal is used for the positive DC
voltage or the hot side of the AC voltage. The device is reverse voltage protected and as such will not operate if con-
nected backwards.
The common of the power supply is connected to the terminal marked COM. Note that this device has a half-wave type
power supply which means the power supply common is the same as the output signal common. Therefore, several
devices may be connected to one power supply and the output signals all share the same signal common. Use caution
when grounding the secondary of an ac transformer or when wiring multiple devices to ensure that the circuit ground
point is the same on all devices and the controller. In general, the transformer should not be connected to earth ground
when using devices with an RS-485 network connection.
The analog output signal is available on the OUT terminal. This signal is jumper selectable for either voltage or 4-20 mA
output signal type. See Figure 6. The voltage output signal defaults to 0-5 Vdc but may be changed to 0-10 Vdc via the
menu. These options are clearly indicated on the device PCB. The analog output signal is typically connected directly to
the Building Automation System (B.A.S.) and used as a control parameter or for logging purposes. Check the controller
Analog Input type to determine the correct connection and signal type before applying power. The device generates
the analog output signal (sourcing) and must not be connected to a
powered input or device damage may occur.
For voltage type output signal the device has a minimum load that
it is able to drive, similarly for current type output signal the device
has a maximum load that it is able to drive with a particular power
supply voltage. Observe and follow these ratings in the Specica-
tion section or inaccurate reading may result. The 4-20 mA output
signal can easily be converted to a 1-5 Vdc signal for controllers
accepting this type of input. Simply insert a 250 ohm (0.1% is best)
resistor between the “+” and “-” inputs of the controller. This will
convert the 4-20 mA signal to the desired 1-5 Vdc. See Figure 7.
If the device includes the optional network connection, use twist-
ed shielded pair to connect to the terminals marked A-, B+ and SH
(SHIELD). The positive wire connects to B+, the negative to A- and
the cable shield must be connected to the SH terminal on each
device. The shield wire should be connected to earth ground at one
end of the network only. If the device is installed at either end of
an RS-485 network, an end-of-line (EOL) termination resistor (121
Ω) should be installed in parallel with the A- and B+ terminals. See
Figure 8. This device includes a network termination resistor and
jumper that can be used to connect the EOL resistor on the PCB.
Simply move the jumper to the EOL position and no external resis-
tor is required. See Figure 9.
A network segment is a single shielded wire loop run between
several devices (nodes) in a daisy chain conguration. The total
segment length should be less than 1220 meters (4000 feet) and
the maximum number of nodes on one segment length is 128.
Nodes are any device connected to the loop and include controllers
but do not include the EOL terminators. To install more than 128
devices, or to increase network length, repeaters will be required
for proper communication. The maximum daisy chain length (seg-
ment) depends on transmission speed (baud rate), wire size and
number of nodes. If communication is slow or unreliable, it may be
necessary to wire two daisy chains to the controller with a repeater
for each segment.

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An optional signal is the alarm relay output available on the NO (NORMALLY OPEN), NC (NORMALLY CLOSED) and
R.COM (RELAY COMMON) terminals. The R.COM terminal is not connected to the power supply COM terminal, the
relay output is completely isolated. The relay contacts may be connected to a controller Digital Input (DI) for status mon-
itoring or used to directly control an alarm or ventilation fan. Do not exceed the device contact ratings. In some cases, a
separate control relay may be used between the PM sensor relay and a large fan for example. See Figure10.
Operation - Start Up
After applying power to the device, it will enter the start-up mode and the LCD will indicate the software version number, the
PM range, the PM alarm setpoint (if applicable) and the analog output type for two seconds each.
If the network option is installed, then the start-up sequence will also show the network protocol, the baud rate and the
device address. Then the device will start normal operation and display the PM concentration value.

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Operation - Normal
During normal mode the device reads the PM sensor and calculates the Air Quality Index based on a 24 hour time average.
The real time PM concentration value is displayed on the LCD and set as the output value for the analog output. The output
value is updated once per second. The LCD may be congured via the menu to display either the PM value or the AQI. If the
optional tri-color LED is installed, it will change color to indicate Good (Green), Moderate (Yellow) or Poor (Red) air quality.
On start-up when the rst readings are obtained, the Air Quality reading for the device averages the concentration level
as necessary until the required time base setting is reached. For example, if only 10 readings are available then the out-
put value is calculated as the average of those 10 readings. The next output value will be an average of 11 readings. This
short-averaging will continue until the unit has been running for 24 hours. Once 24 hours is reached then the AQI value will
always be the average of readings over the past 24 hours.
The device also monitors the keypad and takes appropriate menu actions for setup. The network version of the product
allows for conguration of settings via BACnet®or Modbus protocol and the BACnet®objects or Modbus registers are up-
dated with the appropriate values and alarm conditions are monitored.
Operation - Alarm
All models except for the analog output only without relay will have a PM setpoint alarm. The alarm will control the optional
relay or network variables as applicable to the model. The PM alarm setpoint, hysteresis and time delay may be congured
via the menu or network. The details of each setting and operation is explained in the Setup Menu section.
Operation - Setup Menu
The Setup Menu has several items as shown below. To enter the menu, press and release the <MENU> key while in nor-
mal operation. This will enter the Setup Menu step 1, pressing the <MENU> key a second time advances to step 2. Each
press of the <MENU> key saves the selection and advances the menu item. The <ROLL> key is used to make changes to
program variables by scrolling through the available options. If the Setup Menu is not active for 5 minutes (no key press),
then the menu will exit and the device returns to normal operation.
<MENU> Press and hold to enter the setup menu. Once in menu release <MENU>.
1. Particulate matter range
The default PM Range is PM10. Use <ROLL> to change the range as required to either PM1.0,
PM2.5, PM4.0, or PM10.
<MENU> Press to advance to next menu item.
2. Voltage output signal
Use <ROLL> to set the voltage output signal type to 0-5 or 0-10 Vdc. The factory default is 0-5
Vdc.
<MENU> Press to advance to next menu item.
3. Analog output
The analog output defaults to Direct (4-20 mA, 0-5 Vdc or 0-10 Vdc). Use <ROLL> to change it to
Reverse (20-4 mA, 5-0 Vdc or 10-0 Vdc) if required.
<MENU> Press to advance to next menu item.

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4. Analog output scale
The default analog output scale is 0-1000 ug/m3. The maximum value can be changed from 500
to 1000 (resolution 100) using <ROLL> if required. For example, the output can be 4-20 mA =
0-700 ug/m3.
<MENU> Press to advance to next menu item.
5. Display information
The default analog output scale is 0-1000 ug/m3. The maximum value can be changed from 500
to 1000 (resolution 100) using <ROLL> if required. For example, the output can be 4-20 mA =
0-700 ug/m3.
<MENU> Press to advance to next menu item.
6. Backlight
The backlight operation defaults to Auto operation. It can be set to O󰀨 or On using <ROLL>. Auto
means the LCD backlight only lights when a menu is accessed, o󰀨 means it never lights and on
means it is always on.
<MENU> Press to advance to next menu item.
Only if Relay OR Network Option installed
7. Setpoint alarm Setpoint for PM alarm and relay (if installed) activation. Default setpoint
for alarm activation is 150 ug/m3. Use <ROLL> to adjust from 50-900 ug/
m3. Resolution is 10 ug/m3.
<MENU> Press to advance to next menu item.
8. Alarm
hysteresis
The default PM alarm hysteresis is 20 ug/m3. Use <ROLL> to change to
10, 15, 20, 25, 30, 35 or 40 ug/m3. If the PM Alarm setpoint = 150 and
hysteresis = 20, then the alarm will be set if the PM exceeds 150 and will
reset when it falls below 130.
<MENU> Press to advance to next menu item.
9. Alarm delay The default PM alarm delay is 0 minutes. Use <ROLL> to change from 0
to 10 minutes to prevent false alarms. Resolution is 1 minute.
<MENU> Press to advance to next menu item.
10. PM alarm The default PM alarm test is O󰀨. Use <ROLL> to toggle it O󰀨 or On. When
set to On, an alarm condition is forced for testing purposes. If a relay is
installed it will also be activated. The alarm condition will be reset to O󰀨.
<MENU> Press to advance to next menu item.
Only if Network Option installed
11. Baud rate The default network baud rate is 9600. Use <ROLL> to select 9600,
19200, 38400, 57600, 76800 or 115200 as required.
<MENU> Press to advance to next menu item.
12. Address The default network address is 3 for BACnet®and 1 for Modbus. Use
<ROLL> to select 0-127 for a BACnet®device or 1-255 for a Modbus
device.
<MENU> Press to advance to next menu item.

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Specications subject to change without notice.
©, Distech Controls Inc., 2019. All rights reserved.
Global Head O󰀩ce - 4205 place de Java, Brossard, QC, Canada, J4Y 0C4 - EU Head O󰀩ce - ZAC de Sacuny, 558 avenue Marcel Mérieux, 69530 Brignais, France
Only if Modbus Option installed
13. Parity value The default network address is 3 for BACnet®and 1 for Modbus. Use
<ROLL> to select 0-127 for a BACnet®device or 1-255 for a Modbus
device.
<MENU> Press to advance to next menu item.
14. Stop bits Use <ROLL> to toggle the stop bits between 1 and 2. The default Modbus
stop bits is 1.
<MENU> Press to advance to next menu item.
15. CRC value Use <ROLL> to set the CRC value to A001 (CRC-16 reverse), 1021
(CITT), 8005 (CRC-16) or 8408 (CITT reverse). The default CRC poly-
nomial is 0xA001.
<MENU> Press to advance to next menu item.
15. Slave
response
Use <ROLL> to change the value from MIN (minimum) to 50, 100, 150,
200, 250, 300 or 350ms. The factory default slave response delay is min-
imum (minimum delay means just more than 3.5 character time delays,
4ms for 9600 baud rate, for example).
<MENU> Press to advance to next menu item.
Operation - Testing/Commissioning (Optional)
To perform testing or commissioning the unit should be congured to display PM reading since AQI reading requires op-
eration over 24-hour period. To verify sensor is reading properly a CO BUMP KIT can be used to generate particulates.
Hold wick close to inlet of sensor (bottom of cover).
Sensor PM reading should increase.
This will verify sensor is reading higher PM levels and is operational. If sensor readings do not increase with smoke then
sensor is faulty.