[ENG] 4.5. [DKSF 70/71.6 IU] Configuring Upper and Lower Threshold of a Norm of a Temperature Sensor

Owned by Olga Talanova (Unlicensed)
Last updated: Dec 22, 2016
1 min read

To configure a top and bottom margin of a safe range for a temperature sensor, there is a need to go to the page «TEMPERATURE» of a device web interface:

where:

Top Margin of Safe Range, °C – is a field for setting a top margin of a temperature range for each temperature sensor. A temperature range is used to specify conditions for generating SNMP TRAP and Syslog notifications as well as e-mail and SMS notifications (in a device with an embedded GSM modem). On default: 60

Bottom Margin of Safe Range, °C – is a field for setting a bottom margin of a temperature range for each temperature sensor. A temperature range is used to specify conditions for generating SNMP TRAP and Syslog notifications as well as e-mail and SMS notifications (in devices with an embedded GSM modem). On default: 10

To prevent frequent triggering of a top and bottom margins, a switching hysteresis of 1°C is used.

A hysteresis sets a «corridor» around a specified temperature, within the limits of which top and bottom margins of a safe range do not respond to temperature oscillations. This feature allows to avoid frequent random notifications from a temperature sensor caused by natural spontaneous oscillations of a temperature measured by a sensor. If a current status of a temperature sensor is «above normal», then a threshold for switching a status is a specified temperature minus a hysteresis value. And vice versa, if the current status is «below normal», then a threshold for switching is a specified temperature plus a hysteresis value. As soon as a temperature increases or decreases reaching a threshold value (taking a hysteresis into account), thus leaving margins of a «corridor», a temperature status is changed. Operation logic of hysteresis is explained in the picture below.

Graph hysteresis in NetPing devices.

Status – displays a current status of a temperature sensor. Its possible values are:

  • Failure – a temperature sensor is not connected or does not respond;
  • Normal – a temperature sensor responds and a temperature value is within the margins of a specified range for this temperature sensor;
  • Above normal - a temperature sensor responds, and a temperature value is above a specified range for this temperature sensor;
  • Below normal - a temperature sensor responds, and a temperature value is below a specified range for this temperature sensor

After changing the settings, there is a need to save the parameters by clicking the button «Apply changes».