Starting at $725.00 Starting at $688.75



  • Accuracy ±(0.015% of mV Setting + 0.009mV)
  • Calibrate in temperature for your TC type
  • Single (520B) or multiple (521B) TC types
  • Typical accuracy of ±0.35°C (0.5°) for Type K
  • EZ-Dial knob easily adjust output by 0.1°C or 0.1°F
  • 3 position EZ-Check switch
    • 0% and 100% span adjustments
  • Battery life of 45hr under typical continuous usage
  • Easy access to battery compartment
  • Lightweight and Rugged with a Solid Feel
  • Small and tough
  • Protected to 60V

This is the recommended replacement for the Altek 22 Thermocouple Calibrator.

What's in the Box

  • AA Alkaline batteries
  • NIST Traceable Calibration Certificate
  • mV wire kit (leads with retractable shield banana plugs & alligator clips)


The PIECAL 520B & 521B thermocouple sources simulate standard thermocouple curves over the entire industrial temperature range. Both units provide a precise, economical, easy to use thermocouple source for checkout and calibration of all thermocouple instruments—including transmitters, recorders, controllers, alarms, data acquisition, and computer systems—in the field, shop or control room

The PIECAL 520B & 521B thermocouple sources work with the thermocouples you use including types J, K, T, E, R, S, B, N, G, C, D, L (J-DIN), U (T-DIN) and P (Platinel II). Choose the PIECAL 520B if you have only one type of thermocouple connected to your instruments or the PIECAL 521B if you have multiple types of thermocouples. Both units include a miniature thermocouple connector on the top end for fast connections and are cold-junction compensated for changes in ambient temperature.

The PIECAL 520B & 521B thermocouple sources work with both newer instruments as well as older instruments. Easily set any value quickly to within 0.1° with the adjustable digital potentiometer plus store any three temperatures for instant recall with the EZ-CHECK switch. The 520B and 521B include a backlit display with larger digits, rugged switches and a battery compartment for fast battery changes. Add an optional rubber boot with tilt stand for extra protection.


Here's how some of our customers use this product...

Verification of PID Controllers in a Plastics Manufacturing Plant

The Background: Our customer manufactures plastic filaments and needs a way to test the input accuracy of the PID controllers used to control the extruders which make the filaments.

The Problem: The customer was previously testing their controllers using an older style Simulator and the unit was not holding calibration.

The Solution: We recommended the PIE 521B thermocouple simulator which allows the customer to test and verify the input on all the extruders they use with great ease. The 521B includes an EZ-Dial knob that allows them to quickly test the desired test points. They are also able to now check pre-determined set points with the EZ-Check switch. This allows them to get these tests done much faster and more accurately than ever before.

In Stock

Part Number Price Available
PIE 520B-T
$688.75 5 in stock
PIE 521B
$878.75 2 in stock

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Other part numbers are available to order but are not currently in stock. Current availability for non-stock parts is "Usually ships in 4-6 weeks". Click here to select options