Condensation; High-Temperature Fault; Remote Reset Option - Honeywell SPM Technical Handbook

8
Legend
8. Main power switch
80. Power In LED
81. Heater On LED
If the SPM is disconnected from an AC source for more
than 30 minutes, the SPM must be allowed to warm up
for up to one hour before setting the main power switch
(8) on.
Caution
The surface of the front panel may be HOT. Use
care when replacing fuse and/or Chemcassette
Caution
• The main power switch (8) does not turn off
power to the heater.
• Power to the heater is applied whenever the
internal unit temperature is +10°C (+50°F) or
below with the main power switch (8) in either
"on" or "off" position.
• Disconnect the power source when wiring
the alarm contacts and during servicing as
required.
SPM Technical Handbook
SPM
SYSTEM Single Point Monitor
STATUS
0.0 PPM
ALARM
RELAY
ALARM ALARM
DIS-
TEST RESET MDA Scientific, Inc.
ABLE
80
81
SPM Single Point Monitor

5.9.2 Condensation

A sudden extreme temperature change may cause
moisture in the SPM to condense. The optics block may
fog, causing the SPM to show a gas concentration. Allow
ample time for the SPM to warm up before attempting
to monitor.

5.9.3 High-temperature Fault

If the internal temperature exceeds +50°C (+122°F), the
SPM will go into fault mode. (FAULT #36) will appear
on the LED display, the audio alarm will sound, and the
instrument fault relay will de-energize. If the Heater On
LED (81) is lighted, then the heater thermostat is at fault.
Contact Honeywell Analytics Service for assistance.
If the internal temperature exceeds +70°C (+158°F), the
power to the heater and instrument will be turned off.
The SPM will not power up or monitor until the internal
temperature falls below +40°C (+104°F). All relay outputs
and alarms will revert to the power off condition.
Note:
Certain target chemicals to be monitored
may or may not be in the gas or vapor state at
low temperatures. This depends on the vapor
pressure/temperature of the target chemical.
.
®

5.10 Remote Reset Option

The Remote Reset Option allows remote activation of
the SPM alarm reset function. This option allows SPM
alarms and faults to be reset without local presence at
the SPM monitoring site.
The illustration shows the 14-pin circular connector (3)
for standard SPM units. Pins E and N provide the two
contacts for remote reset. On instruments fitted with the
Z-Purge option, see
interior wiring of remote reset connections.
5-14
Section 5.2.6 for instructions on