Bühler technologies Nivotemp NT 61 - 1 Introduction; Intended Use; Functionality; Liquid Level Monitoring

Nivotemp NT 61, NT 61-HT, NT 63, NT 63-
LTD/Nivovent NV 71, NV 73
1 Introduction
1.1 Intended Use
Level switches are used to monitor the liquid level and temperature in fluid systems.
Level switches must not be used in highly flammable or corrosive liquids.
The medium must not contain particles, particularly metallic particles, to prevent deposits on the float or between the float and
switching tube. If necessary, filter the medium.
Please note the technical data in the appendix for the specific intended use, existing material combinations, as well as temper-
ature limits.
WARNING
All device models are solely intended for industrial applications. They are
not safety com-
ponents
. The devices must not be used if failure or malfunction thereof jeopardises the
safety and health of persons.
Use in explosive areas is
prohibited
.
1.2 Functionality
1.2.1 Liquid level monitoring
The measuring tube is located inside the tank. The level switches are located inside the measuring tube. These are activated by a
magnet inside the level switch float.
On models NT63 and NV73 the liquid level is continuously measured via reed-contact. The data is output via 4-20mA analogue
signal. The NT63-LTD has an IO-Link standard interface for output.
On models NT61 and NV71 the contacts are mounted to a perforated rail spaced as specified in the purchase order, but can be
moved if necessary.
1.2.2 Temperature monitor
The temperature is monitored via thermal element mounted to the end of the rail. Choose from temperature contacts with
fixed increments, a resistance thermometer (Pt100) or a temperature transmitter.
In the case of continuous temperature measurement (model key "KT" / temperature transmitter) an analogue signal between 4
and 20mA is output. The NT 63-LTD only has an IO-Link standard interface for output.
When equipped with resistance thermometer (model key "Pt100") the temperature is output using the change in resistance
(0°C = 100Ω) of the Pt100.
Please note the technical data in the appendix.
2 Bühler Technologies GmbH BE100019 ◦ 08/2020