Table of Contents
Advertisement
Description
Normal operation/no gas present
Initiate calibration
Zero calibration complete
Calibration fault indication
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.
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.
4.1
Table 3—Calibration Sequence
Current
LED
4.0 ma
Off
2.2 ma
On steady
2.0 ma
Flashing
1.6 ma
Off
Operator action
If the possibility of background gases exists, purge the
sensor with clean air to ensure accurate calibration.
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.
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.
See Troubleshooting Table.
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.
12
95-8522
Advertisement
Table of Contents
