nvent 910 Series Installation, Operating And Maintenance Instructions page 36

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Range: –76°F to 1058°F (–60°C to 570°C)
Procedure: Adjust the HIGH TS 2 ALARM temperature setpoint to the desired value. Note that
the HIGH TS 2 ALARM must be enabled in order to adjust the HIGH TS 2 ALARM temperature
setpoint unless the TS 2 high limit cutout feature is enabled.
IMPORTANT: If no second sensor is installed this alarm should be disabled. This alarm may be
used for applications where a product that is sensitive to over temperature is involved. General
usage could result in nuisance alarms due to the flow of hot product or steam out. This may be
a case where the alarm could be enabled and non-latching temperature alarming used. A high
temperature condition resulting from a forced on failure of the heating circuit should first be
alarmed by the SWITCH FAILURE ALARM. See Section 5.5.18 for more information.
5.4.7 LOW TEMPERATURE SENSOR ALARM FILTER TIME SETTING
Purpose: The LOW TS ALARM FILTER will prevent LOW TS 1 and/or LOW TS 2 ALARMS from
being indicated until their corresponding alarm condition has existed for the duration of the
LOW TS ALARM FILTER time.
Range: 0 to 999 minutes
Procedure: Adjust the LOW TS ALARM FILTER time to the desired value. Note that either the
LOW TS 1 ALARM and/or the LOW TS 2 ALARM must be enabled in order to adjust the LOW TS
ALARM FILTER time.
IMPORTANT:
• If an alarm condition appears and then disappears before the alarm filter time has expired,
the filter timer is reset and the alarm condition must exist again for the entire alarm filter
time before the corresponding alarm will be indicated.
• If the user resets an alarm while the alarm condition is still exists, then the alarm will not be
indicated again until the entire alarm filter time has expired.
5.4.8 HIGH TEMPERATURE SENSOR ALARM FILTER TIME SETTING
Purpose: The HIGH TS ALARM FILTER will prevent HIGH TS 1 and/or HIGH TS 2 ALARMS from
being indicated until their corresponding alarm condition has existed for the duration of the
HIGH TS ALARM FILTER time.
Range: 0 to 999 minutes
Procedure: Adjust the HIGH TS ALARM FILTER time to the desired value. Note that either the
HIGH TS 1 ALARM and/or the HIGH TS 2 ALARM must be enabled in order to adjust the HIGH
TS ALARM FILTER time.
IMPORTANT:
• If an alarm condition appears and then disappears before the alarm filter time has expired,
the filter timer is reset and the alarm condition must exist again for the entire alarm filter
time before the corresponding alarm will be indicated.
• If the user resets an alarm while the alarm condition is still exists, then the alarm will not be
indicated again until the entire alarm filter time has expired.
• The HIGH TS ALARM FILTER time setting will not affect the cutout time when the HIGH LIMIT
CUTOUT feature is enabled.
5.4.9 LATCH TEMPERATURE SENSOR ALARMS SETTING
Purpose: This allows for the selection of automatic clearing of all HIGH and LOW TS ALARMS
(non-latching) when a temperature alarm condition no longer exists or permanent alarming of
such a condition (latching) until the alarm is manually reset.
Setting: YES (LATCHING) or NO (NON-LATCHING)
Procedure: Adjust the LATCH TS ALARMS setting to the desired mode (latching or nonlatching).
IMPORTANT:
• If your application is subject to periodic situations where cold or hot product is part of the
process, it may be appropriate to configure the HTC for non-latching temperature alarms to avoid
nuisance alarms. If it is important to be aware of any temperature alarm conditions that may
have existed in a pipe, then the HTC should be configured for latching temperature alarms.
• This setting does not affect the TS FAILURE ALARMS—these are always latching.