Measurement Computing WiFi-500 Sensor Series - Manual (Page 11)

WiFi-500 Sensor Series User's Guide Changing device logging settings
11
Configuring alarms
In the TEMPERATURE ALARMS and HUMIDITY ALARMS dialog boxes, you configure the following alarm
settings:

Low/High Alarms – Enable alarms that are triggered when a device logs data that exceeds a high
temperature/humidity value, or that is below a low temperature/humidity value.
 The low alarm value must be less than the high alarm value.

Alarm Delay – Filter out unwanted alarms by selecting a delay time from the dropdown box. For example,
when monitoring the temperature of a refrigerator, you might not need to know if the temperature exceeds
the alarm level briefly – when someone opens and closes the door, for instance – but you do need to know
if someone leaves the door open for more than one minute.
You can set a separate delay for temperature and humidity alarms.

Alarm Hold – Holds an alarm state even when the temperature/humidity returns to an acceptable range. For
example, if the high temperature alarm is set to 42°C and the measured temperature rises to 46°C, an alarm
is triggered. If the reading then drops down to 41°C when the
Alarm hold checkbox is selected, the device
retains its alarm status.
If Alarm hold is not selected, the device reverts back to normal status, and the only way to check missed
alarms is to review the logged data.

Audit Check – Record an event on the graph by pressing and holding the device button for three seconds to
indicate an onsite check of the device.
Complete the following steps to configure WiFi-500 Sensor Series temperature and humidity alarm settings:
1. Select the On option button for Low alarm to enable a low alarm, and then select a low
temperature/humidity alarm value from the list.
2. Select the On option button for High alarm to enable a high alarm, and then select a high
temperature/humidity alarm value from the list.
3. Select the On option button for Alarm hold to retain the alarm status when the temperature/humidity
returns within the alarm range.
4. Select a delay time from the Delay alarm trigger by listbox to filter out unwanted alarms.
5. Select the Enable option button for Audit Check to record an event on the graph when a device is checked
onsite ( TEMPERATURE SETTINGS dialog box only).
6. If you are setting up a device that includes a thermistor probe, select the probe type you are using from the
drop-down listbox.
Figure 4: Probe type list
Refer to the label attached to the probe cable for the probe number. Selecting an incorrect probe type causes
inaccurate measurements.
Figure 5: Probe type label