Share This Page

Search The Site
Our Product Range

Tel:   +44 (0) 1792 588 722
Fax:  +44 (0) 1792 582 624

PIE Model 535 4-20 & 10-50 milliamp Loop and Voltage Calibrator

The Model 535 from Practical Instrument Electronics (PIE) brings the features of a calibrator for 4-20 milliamp as well as 10-50 milliamp process loops in one pocket sized unit.

The EZ-Dial™ knob and EZ-Check™ switch are all that’s needed to make quick adjustments or set 0% or 100% of full scale.

The EZ-Step™ button provides one-handed stepping. Automatic stepping and ramping modes allow hands-free testing and calibration of the process loop with HIGH accuracy and repeatability designed in collaboration with Nuclear plants. The basic Model 535 supplies over 42V at 50 mA to power most instruments. The Model 535-50 supplies over 50V at 50 mA for instruments requiring power supplies of 48 V dc.

With the Model 535, calibration is easy as PIE.

  • 4 to 20 mA Loop Functions
    Source and Read 0.000-24.000 mA
    Simulate 2-Wire Transmitters
    Power 2-Wire Transmitters and Read 0.000-24.000 mA
    Display current in mA or -25.00 - 125.00 % of 4-20 mA 
  • 10 to 50 mA Loop Functions
    Source and Read 0.000-50.000 mA
    Simulate 2-Wire Transmitters
    Power 2-Wire Transmitters and Read 0.000-50.000 mA
    Display current in mA or -25.00 - 105.00 % of 10-50 mA 
  • Read Voltage Function
    Read 0.00 to ± 30.00 VDC with 4X over range ability 
  • Source Voltage Function
    Source 0.000 to 24.000 VDC 
  • High Accuracy
    ±0.025% of reading 
  • Full 5 Digit Display
    Bar graph for quick reference of input and output levels
    High contrast graphic display viewable in all lighting conditions and angles 
  • EZ-DialTM Knob
    Change the speed of dialing your test point by just pushing down on the knob
    Easily adjust output by 0.001 mA (0.01 %) or 0.100 mA (1.00 %) 
  • EZ-CheckTM Switch with EZ-StepTM Button
    3-position tactile switch with push button for true onehanded calibrations
    Push button for stepping through calibration points
    16 different step sizes
    Hands-free auto step and auto ramp modes
    Selectable soak and step time for working with valves 
  • Industry Standard Input/Output Connections
    Conveniently located banana jacks on top panel 
  • Optional Analog Output
    Model 535A includes a 10 mV/mA proportional output provided on bottom panel banana jacks for connection to chart recorders and data loggers
  • Uses 4 AA Alkaline Batteries
    Superior battery life of 10 hours in source mode
    >40 hours battery life in read mode
    Easy access to battery compartment
  • 240 VAC Tolerant
    Fuse-less protection from accidental misuse
  • Lightweight and rugged with a solid feel
    Convenient Velcro® hand strap allows for a firm confident grip or attachment to pipes and ladders.


An experienced manufacturer of calibration
equipment for the process industry.