Thermotronik TT-77
4 Setup and connection
DANGER
Electric voltage
Risk of electric shock
a) Always disconnect the unit from the mains before performing work.
b) Secure the equipment from accidental restarting.
c) The equipment may only be installed, maintained and put into operation by instruc-
ted, competent personnel.
d) Always observe the applicable safety regulations for the operating site.
DANGER
Toxic, acidic gases/liquids
Protect yourself from toxic, corrosive gasses/liquids when performing any type of work.
Wear appropriate protective equipment.
4.1 Installation
When installing directly to the tank, the sensor is screwed into the designated bore on the tank.
When installed with remote display, the display and control unit are mounted to a 35 mm (1.4") top-hat rail. The sensor connects
with a line. The connector for the sensor is located at the bottom of the display and control unit. The plugs at the top supply
power and output the signals.
4.2 Electrical connections
Electricity is supplied via plug connectors. Please refer to the appendix for installation dimensions, nominal voltage and plug
configuration.
The temperature switching outputs are PNP transistors (see illustration):
Supply voltage
Note:
When measuring the switching output with high-load measuring device inputs or when used as a frequency output, the
load must be set to 10 kΩ between the output and earth (GND) to avoid faulty measurements.
8
Bühler Technologies GmbH
BE140013 ◦ 07/2019
Summary of Contents for Thermotronik TT-77
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