4.1
12
95-8522
To convert PIRVOL milliampere output to % by volume
gas concentration, use the following formula:
(milliamp signal – 4.0) x 5.625 = % by volume propane
Example:
(4.0 – 4.0) x 5.625 = 0%
(12.0 – 4.0) x 5.625 = 45% by volume
(20.0 – 4.0) x 5.625 = 90% by volume.
DEVICE REPAIR AND RETURN
The PIRVOL Process Monitor is not designed to be
repaired in the field. If a problem should develop, first
carefully check for proper wiring. If it is determined
that the problem is caused by a mechanical or
electronic failure, the device must be returned to the
factory for repair.
Prior to returning devices or components, contact
the nearest local Detector Electronics office so that
a Service Order number can be assigned. A written
statement describing the malfunction must accompany
the returned device or component to expedite finding
the cause of the failure.
Pack the unit or component properly. Use sufficient
packing material in addition to an anti-static bag
or aluminum-backed cardboard as protection from
electrostatic discharge.
Return all equipment transportation prepaid to the
factory in Minneapolis.
Description
Current
LED
Operator action
Normal operation/no gas present
4.0 ma
Off
If the possibility of background gases exists, purge the
sensor with clean air to ensure accurate calibration.
Initiate calibration
2.2 ma
On steady
Initiate the calibration sequence by holding the calibration
magnet against the side of the junction box or activating the
external calibrate pushbutton for one second.
Zero calibration complete
2.0 ma
Flashing
Re-apply magnet (or activate switch) for one second. Span
calibration is not required. Device will revert to live operation
using new zero level and original span level from factory cali-
bration.
Calibration fault indication
1.6 ma
Off
See Troubleshooting Table.
NOTE: Failure to re-apply magnet to set zero level will result in Fault status if span gas is not applied. Span gas is typically
applied at the factory only.
Table 3—Calibration Sequence
