13 DISMANTLING AND ASSEMBLY
OF SPECIAL UNITS
PAGE
13.6
10 Dry Running Protection Device STP-2A
The STP-2A, which is a device to protect the pump from dry running, mainly consists
of three parts: temperature controller (processor) with LED display, temperature
sensor and if required a safeguard barrier for ex–hazardous application.
1 Functioning Principle
A temperature sensor which continuously measures the stator temperature
(measuring range -35 to +150 °C) is installed in the stator.
If the actual stator temperature rises above the intended cut-off temperature (about 5
°C above the temperature measured during normal running) because of possible dry
running friction heat in the pump, there will be an optical or acoustical signal
indication on the controller, or the pump is switching off immediately.
2 Technical Data of the Temperature Controller
● Microprocessor-based
● Measuring input for PT100 temperature sensor
● LED display, three digits, 13mm high, red indication
● Switching status indication for internal K1 relay
● Supply voltage 12 to 24 V AC/DC, separate mini-transformer available for 115 V or
230 V
● Current consumption: maximum 100 mA
● Storage temperature: -20 to +70 °C
● Permissible operating temperature: 0 to +55 °C
● Relative humidity: maximum 75%, no dew
● Protection class: front side IP 65, back side IP 20
● Safeguard barrier as a special accessory for the sensor to be operated in ex–
hazardous application. For the wiring diagram please see page 13.11R
● Output: 1 relay max. 250 V AC, 2,2 A, 1 change-over contact
● Installation dimensions: Front panel 84 x 42 mm, panel cut out 67,2 x 31,2 mm,
90 mm deep including terminals
● Connection: 12 pole clamp type terminal block for 2,5 mm
2
cable
● Insulation group in accordance with VDE 0110
● All parts relevant to safety meet the VDE and UL requirements
issued: 14.10.2019
Revision: 23
text no.
13105-2/8
copy to:
CAUTION!
Electric current can be harmful.
All work relating to the electrical supply should be carried out by authorized and
qualified personnel and should be in compliance with the requirements of the
relevant national regulations.
85
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