Ametek ATC157A Advanced Temperature
Dry Block Calibrator -45 to 155°C (-49 to 311°F)

  • Dry Block Calibrator (122 to 1202°F) 50 to 650°C, Enhanced
  • Dual-Zone Heating Block-ensures temperature homogeneity throughout the block. Performance equivalent to liquid temperature bath
  • Enhanced Accuracy and Stability by the built-in reference sensor. MVI circuitry ensures stability despite mains supply variations
  • Universal Inputs-handles multiple type temperature sensors, no need for multiple instruments.
  • Automatic, stand alone calibration system. Upload/download your calibration routines
Click here for larger image - Ametek ATC157A Advanced Temperature Dry Block Calibrator (-45°C to 155°C) (-49 to 311°F)Click here for larger image - Ametek ATC650B Advanced Temperature Dry Block Calibrator (-45°C to 155°C) (-49 to 311°F)
Ametek ATC157A Shown

Product Information
Datasheet 1.35 MB
Ordering Guide
Ordering Info Jump to Product Models, Prices, Accessories, and Ordering Information
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The Ametek ATC-157 all features the unique dual-zone heating block - designed for optimum performance and superior temperature homogeneity throughout the block. This new design has a performance equivalent to a liquid temperature bath. The ATC-157 features the widest temperature range for a cooling dry-block on the market today.

Each ATC dry-block calibrator may be used to perform fully automatic calibration routines without using an external computer. Use the computer for full upload and download capabilities. Units may also be supplied with inputs for external reference sensors and for sensors-under-test. All ATC calibrators feature RS232 serial communication and standard delivery also includes the JOFRACAL calibration PC software.

Unique temperature performance

The ATC series of calibrators provide precision tempera-ture calibration of sensors; whatever the type or format. This is accomplished through an innovative dual-zone heating technology.

The Ametek ATC 157 features a dual-zone heating technology. Each heating zone is independently controlled for precision temperature calibration. The homogeneity in the lower part is close to that of a laboratory liquid bath. The lower zone ensures optimum heat dissipation throughout the entire calibration zone. The upper zone compensates for heat loss from the sensor-under-test and from the open top. This design also eliminates the need for insulation of the sensors-under-test and makes it possible to calibrate liquid-filled and other mechanical sensors.

ATC heating and cooling models

The models with both heating and cooling capabilities feature the Peltier element multi-stage-technology. This both improves efficiency and extends the life of the »electronic heat pump«. The Ametek ATC-157 offers a typical differential temperature of 68°C (122° F) below the ambient temperature.

Peltier effect
The practical Peltier element (electronic heating pump) consists of many elements of semiconductor material connected electrically in series and thermally in parallel. These thermoelectric elements and their electrical interconnections are mounted between two ceramic plates. The plates serve to mechanically hold the overall structure together and to electrically insulate the individual elements from one another.

Up to 20 different temperature steps may be programmed including the hold time for each step. Upon completion of an auto step routine, the user can easily read the results for the sensor-under-test. Up to five (5) auto step results are stored.

Easy-to-use, intuitive operation
All instrument settings can be performed from the front panel. The heat source is positioned away from the panel which helps protect the operator.

The ATC keyboard is equipped with five, positive feedback function keys. They correspond to the text in the display and change functionality based on instrument operations. There are also dedicated function keys with permanent functions.

The easy-to-read, backlit display is large with a high contrast that is readable even in high ambient light conditions. The display is easily read from all angles and from a distance without parallax problems. The display also features icons which help identifying instrument conditions and operational steps, making it more intuitive to work with.

Set temperature
The “Set temperature” feature allows the user to set the exact desired temperature with a resolution of 0.01°.

Enhanced stability
A stability indicator shows when the ATC calibrator has reached the desired temperature and is stable. The user may change the stability criteria, external reference and the sensor-under-test quickly and simply. The stability criteria is the user’s security for a correct calibration. A count-down timer is displayed next to the temperature read-out.

Instrument setups
The ATC series allows the user to store up to nine (9) complete instrument setups. You may store all sorts of information including temperature units, stability criteria, use of external reference sensor, resolution, sensor-under-test (SUT), conversion to temperature, display contrast, etc. The setup may be recalled at any time.

Maximum temperature

From the setup menu, the user can select the maximum temperature limit for the calibrator. This function prevents damage to the sensor-under-test caused by the application of excessive temperatures. The feature also aids in reducing drift resulting from extended periods of exposures to high temperatures. This feature can be locked with an access code.

JOFRACAL Calibration Software

The JOFRACAL calibration software ensures easy calibration of RTD´s, thermocouples, transmitters, thermo switches, pressure gauges and pressure switches. JOFRACAL can be used with Ametek DPC-500, APC, CPC and IPI pres-sure calibrators, all Ametek temperature calibrators, as well as Ametek AMC900, ASC300 multi signal calibrator and ASM-800 signal multi scanner.



Minimum Requirements:
  • Intel Pentium II 1.4 GHz Processor
  • 64MB Ram (128MB recommended)
  • Standard VGA (800x600, 256 colors). 1024x768 Recommended
  • CD-Rom Drive for installation of program
  • 1 or 2 free RS-232 serial ports, depending on configurations
Minimum Requirements:
  • Microsoft Windows 98, Microsoft Windows NT 4.0, Microsoft Windows 2000,
  • Microsoft Windows ME, Microsoft Windows XP, Windows Vista\
  • System fonts: MS Sans Serif, Arial
Calibration Software:   View PDF

JOFRACAL calibration software may also be used for manual calibrations, as it can be set up to accept manual entry of calibration data together with other liquid baths, ice points or dry-block heat sources. The calibration data collected may be stored on a PC for later recall or analysis. The ITC calibrator stores the calibration procedure and may be taken out to the process site without using a personal computer.

This then allows the ATC175 to:

  • Operate as a stand-alone instrument, using advanced calibration routines without the assistance of a personal computer on site;

  • Prevent unauthorized changes to a calibration routine. Personnel who are not authorized to alter a calibration routine cannot do so.

Calibration of up to 24 sensors with Ametek ASM
Using the Ametek ITC series together with the ASM Advanced Signal Multi-scanner offers a great time-saving automatic solution to calibrate multiple temperature sensors at the same time.

The ASM series is an eight channel scanner controlled by JOFRACAL software on a PC. Up to 3 ASM units can be stacked to calibrate up to 24 sensors at the same time. It can handle signals from 2-, 3- and 4 wire RTD’s, TC’s, transmitters, thermisters, temperature switches and voltage.
For more info on the ADM Advanced Signal Temperature Mulit-Scanner, please visit to the 7533PC page.

ATC-157 Specifications
Main specifications
Voltage 115V(90-27)
Frequency, non US deliveries 50 Hz ±5, 60 Hz ±5
Frequency, US deliveries 60 Hz ±5
Power consumption (max) 300 VA
Temperature range Maximum 155°C / 311°F
Minimum @ Ambient Temp.
-45°C /-49°F
Resolution Selectable 1º or 0.1º
Stability +0.0.1°C / +0.018°F
Time to stability 6 Minutes
Resolution 1° or 0.1° or 0.01°
Accuracy (with Internal Reference Sensor) +0.13°C / +0.23°F
Radial Homogeneity
(difference between holes)
0.01°C / 0.02°F
Immersion depth 160 mm / 6.3 in
Well Diameter 20 mm / 0.79 in
Heating time -45 to 23°C /-49 to 73°F 6 minutes
23 to 100°C / 73 to 212°F 8 minutes
100 to 155°C /212 to 311°F 9 minutes
Cooling time 155 to 100°C /311 to 212°F 3 minutes
100 to 23°C / 212 to 73°F 6 minutes
23 to 0°C /73 to 0°F 3 minutes
0 to -30°C /32 to -22°F 9 minutes
 -30 to -45°C /-22 to -45°F 15 minutes
SYNC output (dry contact) Switching Voltage Maximum 30 VDC
Switching Current Maximum 100 mA
Input Specifications (RTD)
RTD Type


2-wire RTD
3-4 wire RTD
F.S. (Full Scale) 350 ohm or 2900 ohm
Accuracy (12 months) ±0.005% rdg. + 0.005% F.S. + 50 m
RTD Type

RTD Type Input Chart >>

Input Specifications (Thermocouple)
Thermocouple Type


78 mV

F.S. (Full Scale) 78 mV
Accuracy (12 months) 0.01% rdg. + 0.005% F.S.
Thermocouple Type

Thermocouple Input Chart >>

Physical Specifications
Instrument Weight 13.1 kg / 28.9 lb
Size (L x W x H) 352 × 156 × 360 mm / 3.9 × 6.1 × 14.2 in
Ordering Guide
Model Product Description
ATC-157 series, -45 to 155°C (-49 to 311°F)
Code Model Version
Basic model no sensor-under-test or reference probe input
Including sensor-under-test or reference probe input
Code Mains Power Cable Type
European, 230V
UK, 240V
South Africa, 220V
Italy, 220V
Australia, 240V
Denmark, 230V
Switzerland, 220V
Israel, 230V
Code Insert Type and Size
1 x Insert for dry-block configuration
Code Calibration Certificate
NPL Traceable temperature certificate(standard for Europe, Asia, Australia and Africa)
NIST traceable temperature certificate(standard for Americas)
Accredited certificate
Code Options
Basic calibration kit
Carrying case
90° angled reference sensor with accredited certificate (STS100A901AH)
No option used
Sample Order Number
ATC157B230AM01FX - JOFRA ATC-156 B with standard accessories, 230VAC, European power cord, dry-block configuration with multihole insert type M01, and NPL traceable temperature certificate.
Ordering Information
Model Description Buy Online Price
ATC157A  Ametek ATC157A Dry Block Calibrator Discontinued
See: RTC Series
Included Accessories
  • 1 - Mains power cable
  • 1 - Traceable certificate
  • 1 - Insert
  • 1 - 3 pcs. insulation plugs for 5, 8, 11 mm sensors
  • 1 - Tool for insertion tubes
  • 1 - RS-232 cable
  • 1 - Software, AMECAL-TEMPERATURE
  • 1 - Software, AMETRIM-ATC to adjust the ATC series
  • 1 - Users manual (multi-language)
  • 1 - Reference manual
Optional Accessories
Model Description Buy Online Price
Insertion Tubes: Single hole
123301 Ametek 123301 Imperial Single hole Insertion tube - 7/16" diameter for ATC157A/B & ITC155A Buy Now $170.00
123302 Ametek 123302 Imperial Single hole Insertion tube - 1/2" diameter for ATC157A/B & ITC155A Buy Now $170.00
MFR ID: 125314
Ametek 125314 Imperial Predrilled Single Insertion tube - 1/8" for ATC-157 A/B & ITC-155A Buy Now $160.00
MFR ID: 125315
Ametek 125315 Imperial Predrilled Single Insertion tube - 8 x 3/16" for ATC-157 A/B & ITC-155A Buy Now $160.00
125316 Ametek 125316 Imperial Predrilled Single Insertion tube - 8 x 1/4" for ATC-157 A/B & ITC-155A Buy Now $160.00
MFR ID: 125317
Ametek 125317 Imperial Predrilled Single Insertion tube - 8 x 5/16" for ATC-157 A/B & ITC-155A Buy Now $160.00
60F446 Ametek 60F446 High Temperature Replacement Insert - 8 x 7/8" for ATC-157 A/B & ITC-155A Buy Now $240.00

Insertion Tubes: Multiple Holes

123295 Ametek 123295 Multi-hole Insertion tube (MO2) for ATC157A/B & ITC155A Buy Now $315.00
123297 Ametek 123297 Multi-hole Insertion tube (MO4) for ATC157A/B & ITC155A Buy Now $315.00
123298 Ametek 123298 Multi-hole Insertion tube (MO5) for ATC157A/B & ITC155A Buy Now $315.00