7.1
Alarm Overview
The 42280A has a temperature and a RH alarm function. Alarms function in
both Monitoring mode (when not logging) and in the Datalogging mode. The
front panel Alarm LED flashes when an alarm is triggered.
7.2
Alarm Types
The alarm type is selected in the configuration process. Please refer to Sec-
tion 6.2 for instructions on how to select an alarm type. The alarm types are
explained below.
1. Single Alarm: The alarm triggers when the measured temperature or RH
exceeds the alarm threshold that you program when you configure the log-
ger (Section 6.2), .
2. Cumulative Alarm: The alarm triggers when the
average
measured tem-
perature or RH exceeds the alarm threshold.
3. Disabled Alarm: No alarm action.
7.3
Alarm Thresholds
The temperature and RH alarm thresholds are set when you configure the da-
talogger (see Section 6.2). The alarm threshold is a range of values that rep-
resent a normal measurement region. Measurements outside this region will
trigger the alarm.
Temperature alarms can be set from -22 to 158
℉
(–30 to 70
℃
). RH alarms
can be set from 0 to 100% RH. The default temperature alarm range is 32 to
140
℉
(0 to 60
℃
) and the default RH alarm range is 10 to 90%.
Note that the high temperature threshold cannot be set lower than the low
temperature threshold, and the low alarm threshold cannot be set higher than
the high temperature threshold.
7.4
Alarm Delay Timer
To reduce nuisance and false alarms, a delay timer can be employed. The de-
lay timer is set when you configure the datalogger (Section 6.2). Set the delay
timer from 5 minutes to 2 hours.
7.5
Alarm Alerts
An alarm is triggered when the temperature or RH exceeds the limits you set
when configuring the logger per Section 6.2.
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Summary of Contents for 42280A
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