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1. General information
The temperature switch described in the operating instructions has been designed
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and manufactured using state-of-the-art technology. All components are subject
to stringent quality and environmental criteria during production. Our management
systems are certified to ISO 9001.
These operating instructions contain important information on handling the instrument.
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Working safely requires that all safety instructions and work instructions are observed.
Observe the relevant local accident prevention regulations and general safety
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regulations for the instrument's range of use.
The operating instructions are part of the product and must be kept in the immediate
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vicinity of the temperature measuring instrument and readily accessible to skilled
personnel at any time.
Skilled personnel must have carefully read and understood the operating instructions
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prior to beginning any work.
The manufacturer's liability is void in the case of any damage caused by using the
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product contrary to its intended use, non-compliance with these operating instructions,
assignment of insufficiently qualified skilled personnel or unauthorised modifications to
the instrument.
The general terms and conditions contained in the sales documentation shall apply.
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Subject to technical modifications.
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Further information:
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- Internet address:
www.wika.co.in
- Relevant data sheet:
PV 37.02 . 01/2022
Abbreviations, definitions
DPDT
Double pole double throw
SPDT
Single pole double throw
NC
Normally closed contact type (NC = normally closed)
NO
Normally open contact type (NO = normally open)
COM
Common contact
GND
Ground connection
WIKA operating instructions, temperature switch with adjustability of switch differential, model TS-972
2. Design and function
2.1 Overview
2.2 Description
The temperature element of the model TS-972 instruments are fitted with gas filled thermal
system and suitable for Air, Gas, Water, Steam, Oil, etc.The primary sensing element is
the bulb and the secondary sensing element is a hydraulically formed seamless Phosphor
Bronze Bellows fixed external to the switch housing. Change in temperature which is
sensed by the bulb results in a change in system temperature and this is communicated
through an Armoured capillary to the secondary element (Bellows) which responds to this
change and actuates the mechanism.
2.3 Terms used
Maximum operating temperature
The maximum static temperature with which the instrument can be used without changing
the assured performance data.
Reset point
The temperature value at which the switch returns to the starting position. Mathematically,
the temperature value for the reset point is equal to the temperature value of the switch
point
minus the switch differential on rising temperature. On falling temperature, the temperature
value
for the reset point is equal to the temperature value of the switch point plus the switch
differential.
Switch differential
The switch differential is the difference between the switch point and the reset point.
This is also known as the switch hysteresis.
2.4 Scope of delivery
Temperature switch
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Operating instructions
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Cross-check scope of delivery with delivery note.
Sensor
Cover
Range scale
Lock plate
Range screw
Cable entry
Cable entry
Blow-out disc
ˆ
Deadband
‰
Sensing bulb
Š
2
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