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NOTES:
(i) Averaging is done using a walking window filter. This means the average values used to generate alarms may
differ from the average logged data which uses simple averaging.
(ii) The averaging filter is reset on power up, after pressing the RESET button and after making setting adjustments.
During the initial period the reading will be an average of a shorter period than the averaging time. This may
result in unwanted alarms.
8.3.4 Change the Alarm Settings – Relay 1 [ALA1]
1. Enter password, if required (see section 7.2 on page 18).
2. Scroll DOWN to the ALA1 (Alarm 1) menu heading.
3. Press RIGHT: display shows SP1 (Set Point 1).
4. Press RIGHT again: display shows the set point value (default: 000.0).
5. Adjust the value then press RIGHT: display now shows DEL1 (Delay 1).
6. Press RIGHT again: display shows the alarm 1 delay in seconds (default: 0005 = 5 seconds).
7. Adjust the value then press RIGHT to return to the ALA1 menu heading.
NOTE on range of allowed values:
Set Point: the decimal point is fixed after the 3rd digit. This allows values from 000.1 to 999.9
Delay: this is an integer value. Allows values between 1 and 9999 seconds.
8.4 PLANT STOP FUNCTION [PL.ST]
The digital input to the sensor can be used to disable outputs from the sensor during periods when the plant is not
operating.
Connect a digital input from your plant control system to the digital input labelled IP+/IP– on the sensor (see Figure 4
on page 14 for the location of this item). It requires 24 V to be applied across the input to close it.
When the PLANT STOP function is enabled it functions as follows:
When the digital input is CLOSED, this indicates to the sensor that the process is running and the sensor generates
•
outputs as normal.
When the digital input is OPEN, this indicates to the sensor that the process has stopped. The following changes are
•
made:
a) Emission alarms are disabled.
b) The 4–20 mA output is set to 4 mA.
c) The display value and 4–20 mA output are set, either to 0.000 or to the normal dust reading, depending on the setting
of the PLANT STOP option (i.e. ZERO or DUST).
8.4.1 Enable the Plant Stop Option
1. Enter the password, if required (see section 7.2 on page 18).
2. Scroll DOWN to the PL.ST (Plant Stop) menu heading.
3. Press RIGHT: display shows the status of the Plant Stop option (default: OFF).
4. Use UP/DOWN to toggle between settings (see the table below).
5. Press RIGHT to confirm and return to the PL.ST menu heading.
8.4.2 Summary of Plant Stop Behaviour
SETTING
OFF
ZERO
DUST
8.5 COMMS SETTINGS
8.5.1 RS-485 Settings [R485]
The RS485 menu is available to adjust communications settings when connecting to the sensor via the RS-485 port.
8.5.2 Changing the RS-485 Settings
1. Enter the password, if required (see section 7.2 on page 18).
2. Scroll DOWN to the RS485 (RS-485 settings) menu heading.
22
INSTALLATION AND OPERATION MANUAL – OWNER'S RECORD PEM MANUAL – PARTICULATE EMISSION MONITOR
EMISSION ALARMS
Enabled
Disabled
Disabled
DISPLAY READING
Dust
0.00
Dust
4–20 mA OUTPUT
Dust
4 mA
4 mA
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