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H981 Temperature Measurement Methods and Calibration Unit

产品时间:2022-03-04 10:22:38

简要描述:

● Allows Investigation of Temperature Measurement Methodsand Temperature Scales ● Safe and Suitable For Unsupervised Student Operation ● Allows Investigation of Practical Problems in Measurementof Tem

详细介绍

● Allows Investigation of Temperature Measurement Methods and Temperature Scales 

● Safe and Suitable For Unsupervised Student Operation 

● Allows Investigation of Practical Problems in Measurement of Temperature Using a Variety of Instrument Types 

● Optional Calibration Instrument Available with Traceable Certification to International Standard 

● Optional Computerised Data Acquisition Upgrade 

● Two year Warranty

Introduction 

The measurement of temperature is a fundamental requirement in every branch of engineering, science and technology. The notion of an arbitrary and an absolute temperature scale can be difficult for many students to grasp. This is further complicated by the many and varied methods of measurement and measurement errors that can occur. 

The fact that temperature cannot be measured directly, but has to be inferred from its effect upon a sensor (pressure, voltage, resistance or volume change for example) is also a difficult for many students to appreciate. 

The Hilton Temperature Measurement Methods and Calibration Unit H981 allows students to thoroughly examine a large variety of temperature measurement devices, how errors can be introduced and avoided, methods of calibration and the structure of the International Temperature Scale (ITS-90) 

The unit will be of interest to students in every branch of Engineering, Science, Physics and Technology.

Experimental Capabilities 

 The use of (expansion) liquid in glass thermometers for measurement of fixed scale points.  The use of vapour pressure for temperature measurement. 

 The use of bi-metallic expansion devices for temperature measurement. 

 The Peltier and Seebeck thermo-electric effects. 

 Investigation of junction voltage from different thermocouple types. 

 The use of ice point reference with a thermocouple. 

 The law of intermediate metals and intermediate temperatures associated with thermocouples. 

 Voltage calibration of different thermocouple types using a water-ice reference. 

 The effect of lead resistance and voltmeter meter impedance on thermocouple measurements. 

 Use of a direct reading, internally compensated thermocouple indicator. 

 Connection of thermocouples in series for signal amplification and parallel for averaging of measured temperatures. 

 Investigation of the response rate of various thermocouples and sensors. 

 Investigation of the platinum resistance sensor (PRT), its resistance change with temperature and the reference PRT equation of ITS-90. 

 Investigation of the use of 2, 3 and 4 wire PRT sensor connection and the error effects of lead resistance. 

 The use of a direct reading PRT indicator device. 

 Investigation of the resistance change of a negative temperature coefficient thermistor sensor with temperature.

 The use of a direct reading thermistor indicator device. 

 Calibration of all of the supplied sensors with reference to an accurate platinum resistance thermometer (PT100) 

With the Optional H981A Dry Well Calibrator (and optional UKAS/NAMAS calibration H981B) 

 Calibration of all of the supplied sensors with a dry well calibrator with optional UKAS/NAMAS traceable certification (H981B).

Description 

A bench mounted console provides power and connection points for a variety of instruments and sensors. The console is self contained and is supplied with a wide range of ancillary items and sensors that are stored in a latching aluminium case for security. 

The console also provides power for an external temperature controlled heater that allows sensor calibration and performance at elevated temperatures including the steam reference point (100C). Alternatively this may be supplemented by the optional H981A Dry Well Calibrator. 

An external stainless steel vacuum flask allows ice point reference to be established. 

Electrical safety is provided by a double pole overload and earth leakage circuit breakers. 

Digital panel mounted instruments include: 

 Platinum resistance temperature indicator 

 Thermistor temperature indicator. 

 Thermocouple (type K, nickel-chrome, nickelaluminium) temperature indicator with multiway selector switches. 

 Millivoltmeter. 

All of the electronic indicators provide re-transmission signals for use either by user supplied chart recorders/data acquisition systems or the optional HC981A Computerised Data Acquisition System. 

Dedicated panel mounted accessories include:

 A precision voltage amplifier to allow investigation of the junction output of a variety (type K, type T and type J) of thermocouples at different temperatures both in isolation and with an ice point reference 

 Connection points for thermocouple probes allowing series or parallel connection and investigation of meter and lead resistance effects. 

 Connection points for platinum resistance and thermistor probes to allow investigation of resistance-temperature characteristics. 

 A constant current source and probe connection points for a 4 wire platinum resistance probe. Provision is also made for investigation of 2, 3 and 4 wire connection and errors introduced by lead resistance. 

 Connection points for the optional HC981A 

Computerised Data Acquisition System.

The unit also includes bi-metallic, vapour pressure, liquid expansion and reversible temperature sensing liquid crystal temperature indicating devices for comparison.


 


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