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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.
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 configured 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 first 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 output 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 configuration of settings via BACnet® or Modbus protocol and the BACnet® objects
or Modbus registers are updated 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 configured 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 normal 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.
Network
Modbus
BaudRate
9600
Address
3
100
ug/m3
Version
1.00
PM Range
PM1.0
PM Alarm
150ug/m3
Output
4-20 mA
PM Range
PM10
The default PM Range is PM10. Use <ROLL> to change the range as required to
either PM1.0, PM2.5, PM4.0, or PM10.
Output
0-5 Vdc
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
<MENU>
Press to advance to next menu item
<MENU>
Press and hold to enter the setup menu. Once in menu release <MENU>.
1. PARTICULATE MATTER RANGE
2. VOLTAGE OUTPUT SIGNAL
IN-GE-PMRMCXXX-05
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