3
Function monitoring
To increase operating safety, the Nivotester is equipped with a function monitoring system.
A fault is indicated by a red LED and causes the level alarm relay in the affected channel as well
as the fault alarm to drop out. A fault is signalled when the Nivotester receives no more current
pulses. This could occur for example in the event of a short-circuit, an interruption in the signalling
line to the measuring sensor, vibrator corrosion in the Liquiphant, a defect in the measuring
sensor electronics or a defect in the input circuit of the Nivotester. The function of each channel
can be monitored by pressing the test button. The power supply to the sensor is then interrupted.
Simplified iterative test for Liquiphant M and Liquiphant S (HT)
Regular function checks are a statutory requirement for overspill protection systems. For the
Nivotester and the downstream plant sections, there is the possibility of a function test without
starting up or removing the sensor. For this reason, the Nivotester has a test button on the front
panel for each singal input. Pressing the test button interrupts the power supply. When the test
button is released, the power supply is returned to the Liquiphant and the FEL 57 and the test
phase begins. You can find detailed information on this in KA 147F.
L00-FTL325Px-19-06-xx-xx-001
Two-point control (∆s)
Two-point control is possible in one tank using the three-channel Nivotester (e.g. for pump
control). The switching hysteresis is specified by the installation location of the two measuring
sensors.
Measuring system A simple measuring device consists of one to three measuring sensors, a 1- or 3-channel
Nivotester and control or signal devices. A Liquiphant M, Liquiphant S (high temperature) or
Soliphant can be used as measuring sensor.
[Ex ia]
CH1 CH2
CH3
CH1 CH2 CH3
T
FTL 325 P
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