PTB 157 – Ultra Low Dryblock Temperature calibrator

  • Temperature range –70 to 150 ºC
  • High Accuracy  up 0.07 ºC using external reference sensor
  • Dual Input for reference sensor and senor under test ( TC version)
  • Interchangeable multi-hole inserts
  • Automatic switch test function
  • Automatic Ramp
  • Light to carry with only 8 KG


The PTB 157 is a new ultra-low temperature calibrator, which uses high efficiency Peltier element to cover a wide temperature range from -70 ºC to 150 ºC.
The new block technology allow for fast heating/cooling whilst maintaining high accuracy and stability. The rugged construction and the light weight make it the ideal Temperature Calibrator for on-site or on-board calibration of any type or shape of temperature sensors.

The new PTB157 comes in two different models: TS and TC
-PTB157-TS Temperature Calibrator
-PTB157-TC Temperature calibrator with inputs for reference sensor and sensor-under-test

Interchangeable multi-holes inserts

The PTB157 uses interchangeable multi-holes inserts. The standard range of inserts accommodate most of the standard temperature sensors. Custom inserts are available on request to accommodate non standard temperature sensor testing.

Light and easy to carry with only 8 KGs of weight

We have thoroughly included the weight in our design and have developed new techniques and used different materials  that have made the PTB 157 temperature calibrator lightweight and easy to carry on site without compromising its quality, durability or functionality.

Automatic Switch/Thermostat Test function ( TS and TC version)

Set your automatic ramp ( slope) with up to 0.1ºC per minute rate. The PTB 157 will store for you the contact open and closed. No need for any additional multimeter.
Maximise your time and perform other tasks while the PTB will do the job for you.

Highest Accuracy ( TC Version) to 0.07º C

The TC version is equipped with an built-in high accuracy reference input to be used in conjunction with our SRS ( semi standard PRT)- This feature allows the PTB-TC to perform calibration
with an higher degree of accuracy.- It also eliminates most of the error due to stem conduction and different load

A special 90ºC angled external reference sensor is designed to accommodate calibration of sensors with transmitter head- It provide maximum clearance to the top of the calibrator-
Our SRS external reference sensors are especially designed to improve the performance of our PTB series.
The size and length of the external reference sensors have been chosen to provide best performance on the TC version.  A special linearization/ calibration with the built-in reference input provides maximum reading accuracy better than 0.07 Deg ºC

The user can decide to read with the built-in reference sensor or the more accurate angled external SPRT. The Internal sensor and external sensor readings are independent pf one another

Reading of Sensor Under Test ( TC version)

The PTB157-TC is equipped with a built-in accurate measurement input for sensors under test which enable measurement of RTD and TC. The User can compare the reading of the unit under test to one of the external or internal reference sensor. There is no need to carried on field an additional external hand held thermometer.

EIUK Calibration Software

EIUK is a versatile calibration software that is supplied as standard together with any PTB Temperature Calibrators. The software allows for easy calibration of all kind of temperature sensors, such as RTD´s, thermocouples, and thermo-switches.



Temperature Range
Ambient Temperature @ 23ºC -50°C to 150 °C
Ambient Temperature @ 0ºC -63°C to 150°C
Stability ± 0.02 °C
Axial ± 0.08 °C
Radial ± 0.02 °C
with Internal Sensor ± 0.15 °C
with External Sensor SRS (*) ± 0.07°C   ( TC version only)
Display  Settings
Set Point Range -70°C to 150 °C
Resolution user-selectable 0.1 , 0.01 C
Units user-selectable C, F,K
Calibration Volume
Immersion depth 135 mm
Insert Diameter 35 mm
Standard Insert Supplied 1 insert with 3.5, 4.5,5.5, 6.5, 8.5.10,5 mm pockets
Heating time ambient to 150°C: 30 min ( include time to stability)
Cooling time ambient to -50°C : 60 min (include time to stability)
Thermocouple Input (TC version)
Type K,N,R,S,J,E
Range 0 to 1300 °C
Accuracy ± 1°C Include CJC error
Resolution user-selectable 0.1 , 0.01 °C
RTD’S input ( TC version only)
Type Pt 100 (3/4 wires) IEC
Range -100 C to 700 °C
Accuracy ± 0.3 °C
Resolution user-selectable 0.1 , 0.01 °C
Computer interface RS 232 as standard ( UBS adapter supplied as option) and EIUK software included
Switch Test Yes With automatic log of switch open and switch closed
Ramp Yes fully programmable
Weight 8 Kg
Dimensions 160x340x330 mm
Power Requirement 115 o 230 V – 50/60 Hz
Power 300 VA
 Notes * Require SRS sensor and special UKAS matching calibration. Long term drift not included
Scope of Supply
Each PTB157 is supplied with: Power Cable, RS233 cable, switch test lead, standard insert, insert removal tool, traceable calibration certificate and instruction manual

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PTB 157 – Ultra Low Dryblock Temperature calibrator