Ametek ATC320B Advanced Temperature
Dry Block Calibrator 33 to 320°C (91 to 608°F),
w/Sensor-under test & reference sensor input

  • 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 ATC320B Advanced Temperature Dry Block Calibrator (91 to 608°F), EnhancedClick here for larger image - Ametek ATC320B Advanced Temperature Dry Block Calibrator (91 to 608°F), Enhanced
Ametek ATC320B

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-320B 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-320B 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.

Highest accuracy
The ATC320B calibrators may be supplied with a built-in reference thermometer for use with an external sensor. This feature allows one instrument to provide the freedom and flexibility to perform calibrations at the process site while maintaining a high accuracy.

A special 90° angled external reference sensor has been designed to accommodate sensors with a transmitter head, top connector or similar arrangement.

The user can decide whether to read the built-in reference sensor or the more accurate angled reference sensor from the calibrator’s large, easy-to-read LCD display. The external sensor and the internal sensor are independent of one another. Downloading of reference sensor linearization is done via a personal computer.

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-320B 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.

The “SET-Follows TRUE” makes the instrument tune in until the temperature of the external reference “TRUE” meets the desired “SET” temperature. This is used when it is critical that the temperature of the calibration zone matches the desired temperature when measured with accurate external reference sensors. This feature is ideal when calibrating gas correctors or other custody transfer applications. It is also extremely useful to calculation procedures.

Reading of sensor-under-test
The ATC320B is equipped with built-in converters (inputs) that enables measurement of virtually any type of temperature sensor including:

  • thermostats
  • resistance thermometers (RTD)
  • thermocouples (TC)
  • transmitters
  • milliamps (mA)
  • voltage (V)
The ATC calibrators can be user-programmed for completely automated temperature calibrations. Once the unit is programmed, the instrument operates itself by performing the configured calibration routine. All calibration data is stored and available for uploading and generating exact calibration certificates or reports.

Switch test
Users may perform a thermoswitch test and find “Open”, “Closed” and the hysteresis (dead band) automatically. The instrument retains the last five tests.

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-320B 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, thermoswitches, 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 ATC320B 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-320B Specifications
Functional Specifications
Voltage 115V(90-27)
Frequency, non US deliveries 50 Hz ±5, 60 Hz ±5
Frequency, US deliveries 60 Hz ±5
Power consumption (max) 1150 VA
Temperature range 33°C to 320°C / 91°F to 1202°F
Resolution Selectable 1º or 0.1º
Stability +0.0.1°C / +0.018°F
Time to stability 10 Minutes
Resolution 1° or 0.1° or 0.01°
Accuracy (with STS Reference Sensor) +0.07°C / +0.13°F
Accuracy (with Internal Reference Sensor) +0.20°C / +0.36°F
Radial Homogeneity
(difference between holes)
0.01°C / 0.02°F
Immersion depth 150 mm / 5.9 in
Well Diameter 30 mm / 1.18 in
Heating time 50 to 320°C / 122 to 608°F 7 minutes
Cooling time 320 to 100°C / 608 to 212°F 22 minutes
100 to 50°C / 212 to 122°F 20 minutes
SYNC output (dry contact) Switching Voltage Maximum 30 VDC
Switching Current Maximum 100 mA
Input Specifications
Transmitter Supply Output Voltage 24VDC + 10%
Output Current Maximum 25mA
Transmitter Input mA Range 0 to 24 mA
Accuracy (12 months) +0.01% Rdg. + 0.015% F.S.
Voltage Input VDC Range 0 to 12 mA
Accuracy (12 months) +0.05% Rdg. + 0.015% F.S.
Switch Input
(Dry Contacts)
Test Voltage Maximum 5.0 VDC
Test Current Maximum 2.5 mA
Input Specifications (RTD)
RTD Type


4-wire RTD with true ohm measurements
True ohm measurements are an effective method to eliminate errors from induced thermoelectrical voltages
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-320 series, 33 to 320°C (91 to 608°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 temp. 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
ATC320B230AM01FX - 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
ATC320B   Ametek ATC320B 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
105805 Ametek 105805 Case for ATC Series Dry Block  Buy Now $755.00
Insertion Tube (Predrilled Hole, Singular)
105676 Ametek 105676 Imperial Single hole Insertion tube - 4 x 1/8" diameter for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $190.00
105678 Ametek 105678 Imperial Single hole Insertion tube - 4 x 3/16" diameter for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $190.00
105680 Ametek 105680 Imperial Single hole Insertion tube - 4 x 1/4" diameter for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $190.00
105682 Ametek 105682 Imperial Single hole Insertion tube - 4 x 5/16" diameter for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $190.00
105684 Ametek 105684 Imperial Single hole Insertion tube - 4 x 3/8" diameter for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $190.00
105686 Ametek 105686 Imperial Single hole Insertion tube - 4 x 7/16" diameter for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $190.00
105688 Ametek 105688 Imperial Single hole Insertion tube - 4 x 1/2" diameter for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $190.00
105690 Ametek 105690 Imperial Single hole Insertion tube - 9/16" diameter for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $190.00
105692 Ametek 105692 Imperial Single hole Insertion tube - 5/8" diameter for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $190.00
Insertion Tube (Multi-Holes)
122756 Ametek 122756 Metric Multiple-hole Insertion tube (M04) for ATC320A/B, ATC650A/B  Buy Now $335.00
122758 Ametek 122758 Metric Multiple-hole Insertion tube (M05) for ATC320/650 & ITC320/650  Buy Now $335.00
122760 Ametek 122760 Metric Multiple-hole Insertion tube (M05) for ATC320/650 & ITC320/650  Buy Now $335.00
Insertion Tube (Packs, Blanks)
122719 Ametek 122719 Package of 5 blank insertion tubes for ATC320A/B, ATC650A/B  Buy Now $420.00
122721 Ametek 122721 Package of 5 blank insertion tubes w/ 4mm hole for ATC320A/B, ATC650A/B, ITC320/650A  Buy Now $570.00