Altek 434 Milliamp Loop Calibrator

Sorry, this product is discontinued and is no longer available for purchase. Please call 1-877-766-5412 to find a suitable replacement.PIECAL 434 4-20 mA Loop Calibrator is a suggested replacement model.


Calibrate and troubleshoot all the signals in a standard 4 to 20 milliamp process control loop with Altek 434 Milliamp Loop Calibrator. A 24 mA Source, mA meter, 2-Wire
Transmitter Simulator and a DC Volt meter in one compact unit enables a single tool to perform most calibration and troubleshooting functions.

Calibrate controllers, recorders or other devices in 4 to 20 or 0 to 20 mA loops. Six “AA” batteries provide hours of continuous use. No need to leave the calibrator out of service to charge. Optional AC adapter for continuous use.

Check out the response of a loop by using the Altek 434 Milliamp Loop Calibrator in place of a 2-Wire transmitter. The Altek 434 modulates the current passing through the loop just like a transmitter, but with manual control.

Simultaneously supply power to a 2-Wire transmitter while displaying the 4-20 mA output signal. The Altek 434 supplies a nominal 24 Volts DC to the 2-Wire transmitter and shows the output current of the transmitter with 1 microamp resolution.

Check 24 Volt loop supplies and batteries using the built-in voltmeter. Calibrate instruments with 1-5 Volt outputs.  Measure current anywhere in a loop. Check and adjust transmitter and controller outputs. Also measure current on transmitters with test jacks or across series diodes. Read milliamps with several times the accuracy of handheld DVMs.

Save time with every calibration by using the advanced features of the Altek 434. Instantly recall any three output settings with the handy QUIK-CHEK switch. All output settings are remembered, even with the power off.

Be in two places at once by using the Altek 434’s AUTOCHEK.  Connect behind the panel or replace a transmitter, then check the output in front of the panel or another remote location within the loop. Choose 2, 3, 5 or 10 output steps from 5 to 900 seconds to match your calibration setup.  Use the automatic Ramp/Soak to simulate a running process and check valves for smooth operation.  Independently select your ramp time, soak time and endpoints for total flexibility.

Check valves and actuators with the built-in VALVE-CHEK function. Choose intervals from 5 to 900 seconds to repeatedly step up & down to check valves at and around the fully closed position and the fully open position. Or manually step through the points and use the knob for fine adjustment.
What's Included:

  • Six Alkaline AA Batteries
  • Carrying Case
  • Instructions
  • Manufacturer's Statement of Calibration Practices
  • Test Leads with Banana Plugs & Alligator Clips
The Good:


The Bad:


The Bottom Line:

Full Review


  • Calibrate Loops with Laboratory Accuracy — (0.015% of Reading + 0.002 mA) Accurate to 0.005 mA from 4 to 20 mA.
  • All 4 to 20 mA Loop Functions — 0 to 24 mA Source, mA Meter, 2-wire Transmitter Simulator & DC Volt Meter in a single compact unit. Displays in mA & % 4 to 20 mA.
  • Powers Loop or Transmitter —  Including HART Transmitters —Drives 1200 Ohm Loop Loads - selectable built-in 250 Ohm resistor for compatibility with HART transmitters and communicators.
  • User Settable QUIK-CHEKS — Store HI, SET, LO for instant recall.
  • AUTO-CHEK Step — Automatically switches output in 2,3,5 or 10 steps from five seconds to 15 minutes.
  • AUTO-CHEK Ramp — Automatic Ramp and Soak to smoothly stroke valves or simulate a process.
  • VALVE-CHEK— Output checks valve and actuator openings and closings.

Product brochures

No user reviews available.

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