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

Nivotemp NT 61D, Nivovent NV 71D
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.
The contacts are mounted to a perforated rail spaced as specified in the purchase order, but can be moved if necessary.
The status of the switching outputs for the liquid level will be output to one of the plugs.
1.2.2 Temperature monitor
Temperature is monitored via temperature sensor (Pt100) inside the sensor tube. Depending on the version, there are several
switching outputs combined with one analogue output (4 - 20mA). The temperature is shown in the display.
Please note the technical data in the appendix.
1.3 Design types
The level switch is equipped with different switching and analogue outputs based on the configuration. The outputs are freely
programmable.
The Nivovent type can be equipped with the following options:
VS
Optical contamination indicator for the vent filter: analogue negative pressure display, display range 0.35 bar (5.1 PSI).
BFA*
Filling adapter incl. ribbed flange with screen insert: This option enables adding small amounts of oil through the vent
filter housing. The selected version is built into the respective housing for this purpose.
SSR*
Stilling tube with centring disc and filling adapter: Just as with the BFA, this contains both the stilling tube option as
well as the filler. The stilling tube is made from the same material as the selected immersion tube (MS/VA).
MT
for installation into the multiterminal: Here the basic version is built into the multiterminal (MT).
MTS
for installation into the multiterminal including stilling tube: In addition to the basic version, a stilling tube with cent-
ring disc is built into the multiterminal.
FCT
Fluidcontrolterminal: Here the fluid control terminal (FCT) is mounted directly onto the basic version.
* not in conjunction with FCT and MT/MTS option
The SSR option is available for the Nivotemp type.
Please refer to the type plate for your equipment configuration. In addition to the job number, this also contains the item num-
ber and type designation.
3Bühler Technologies GmbHBE100017 ◦ 01/2020