A brief exposure to one of these materials can
temporarily increase the sensitivity of the sensor.
This results because the surface of the active ele-
ment is increased due to etching. Prolonged
exposure continues the etching process until the
sensitivity of the sensor is degraded, resulting in
shortened sensor life.
Significantly longer sensor life can be obtained by
using the Det-Tronics poison resistant sensor.
D. Exposure to high concentrations of combustible
gases.
Exposure of the sensor to high concentrations of
combustible gases for extended periods of time
can introduce stress to the sensing element and
seriously affect its performance. After exposure
to a high concentration of combustible gas, recal-
ibration should be performed and, if necessary,
the sensor should be replaced.
The degree of damage to the sensor is deter-
mined by a combination of the type of contami-
nant, its concentration in the atmosphere, and the
length of time the sensor is exposed. When a
sensor has been exposed to a contaminant or a
high level of combustible gas, it should be cali-
brated at the time, followed by an additional cali-
bration a few days later to determine whether a
significant shift in sensitivity has occurred.
REPLACEMENT PARTS
The R8471 Controller is not designed to be repaired
by the customer in the field. If a problem should
develop, first carefully check for proper wiring, pro-
gramming and calibration. If it is determined that the
problem is caused by a defect in the controller’s elec-
tronics, the device must be returned to the factory for
repair.
NOTE
When replacing a controller, be sure that the
jumper plugs and rocker switches of the replace-
ment are the same as the original. Remove
power before removing the device from the
mounting cage or plugging in the replacement
unit.
The sensing element is mounted in a sealed housing
and is not intended to be repaired. When calibration
can no longer be properly performed, the sensor
must be replaced. The frequency of replacement will
be determined by the amount and type of contamina-
tion present at the particular installation.
An adequate supply of spare sensors should be kept
on hand for field replacement. For maximum protec-
tion against contamination and deterioration of the
sensing element, the sensor should not be removed
from the original protective packaging until the time of
installation.
Always calibrate after replacing the sensor.
Refer to the “Ordering Information” section for a list of
parts.
DEVICE REPAIR AND RETURN
Prior to returning devices or components, contact the
nearest local Detector Electronics office so that an
RMI (Return Material Identification) number can be
assigned. A written statement describing the mal-
function must accompany the returned device or
component to expedite finding the cause of the fail-
ure, thereby reducing the time and cost of the repair
to the customer.
Pack the unit or component properly. Use sufficient
packing material in addition to an anti-static bag or
aluminum-backed cardboard as protection from elec-
trostatic discharge.
Return all equipment transportation prepaid to the
Minneapolis location.
Detector Electronics Corporation
6901 West 110th Street
Minneapolis, Minnesota 55438 USA
Telephone (612) 941-5665 or (800) 765-FIRE
Telex 6879043 DETEL UW
Cable DETRONICS
Facsimile (612) 829-8750
Detector Electronics Corporation
Suite 106
19925 Stevens Creek Boulevard
Cupertino, California 95014 USA
Telephone (408) 973-7812
Facsimile (408) 973-7256
Voice Mail Box Number: 930
Detector Electronics Corporation
466 Conchester Highway
Aston, Pennsylvania 19014 USA
Telephone (610) 497-5593
Facsimile (610) 485-2078
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