PureAire Monitoring Systems, Inc.
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How to set the zero and full scale range
This will need to be set up in the field to adjust to the length of cable between the Universal Gas
Detector and the remote display alarm indicator. To perform this in the field, first enter the password
on your Universal Gas Detector and select the “Set 4-20mA loop” menu. (See Section 5.5.1 Set 4-
20mA loop in your Universal manual).
On your monitor, use the joystick to select “Set 4mA Zero”. This sends a 4mA signal to the remote
display. On the back of the remote display push the ZERO button for 3 seconds. You’ll see the display
reset and automatically adjust itself to the new zero. If necessary, you can push the joystick up or
down to fine tune the zero reading.
NOTE:
Both AL1 and AL2 LED’s will also be illuminated.
Once adjusted, use the joystick to select
“Set 20mA Span”. This sends a 20mA signal to
the remote display. On the back of the remote display
push the SPAN button for 3 seconds. You’ll see the
display reset and automatically adjust itself to the new
span of the full scale for your monitor. If necessary you can
push the joystick up or down to fine tune the full scale reading.
NOTE:
To fine tune the reading to match the
reading on the monitor, use the
“Set 20mA Span” menu. Push the
joystick up or down until both displays match.
CAUTION:
If the monitor is in the measuring mode and the ZERO push button is pressed an “Err”
will be displayed on the remote display and no readings will be recorded.
If the SPAN push button is
pressed in the measuring mode, the remote display will automatically adjust to over full scale.
You will need to repeat the above adjustment procedure again for the remote display to mirror the
monitor.
NEVER PUSH THE SPAN
in the measuring mode.
How to set the internal alarms on the Remote Display
The Remote Display has two user selectable alarms with a separate horn tone to identify Alarm 1 from
Alarm 2. Both are preset at the factory; AL1 = TLV and AL2 = 2 times TLV. They can be changed in
the field.
To set Alarm 1, Press Alarm 1 for two seconds to enter the alarm change mode. The display will show
the current alarm setting and the right most decimal point will be lit. Use the UP or DOWN buttons to
increase or decrease the alarm value. When done, push the Alarm 1 button for 2 seconds to get back to
the monitoring mode.
