Overview

The CURRENTplate is a precise, eight channel 4-20mA analog to digital board with overcurrent and surge protection on each input. It includes channel to channel isolation as well as channel to the Raspberry Pi isolation to prevent noise producing ground loops.

Features

  • Eight, 4-20mA inputs with 16bit precision
  • All channels isolated from each other and from Raspberry Pi
  • Accuracy guaranteed over 4-20mA range
  • All inputs include transient protection and resettable fuses
  • Pluggable terminal blocks for simplified setup and quick changes
  • Up to eight CURRENTplates can be stacked together to provide a maximum of 64 channels
  • Onboard programmable LED

General

  • 100% Tested and Calibrated
  • Dedicated onboard processor
  • Pluggable 3.5mm screw terminal connections
  • Minimum RPi pins required:  15, 16, 22, and 26 while sharing pins 19, 21, and 23.
  • All features accessible via Python command set
  • Supported by Node-RED
  • Compatible with all 40 pin versions of the Raspberry Pi
  • Can be used in combination with all members of the Pi-Plates family
  • Onboard bootloader for firmware updates.
  • Detailed Online Users Guide with Examples
  • Dimensions (with all terminal block plugs attached): 100mm long x 85mm wide x 25mm high

CURRENTplate

A highly accurate eight channel 16-bit isolated 4-20mA converter with protected inputs.

$79.99Add to cart

Add a DINplate

Our low cost scalable enclosure to mount your Pi-Plate stack to a DIN rail.

$29.99Add to cart

Specifications

Documentation

Suggested Accessories

CASEplate

CURRENTplate Specifications

General

  • A/D Converter Type: Successive Approximation (SAR)
  • ADC Resolution: 16 bits
  • Max Operating Temperature: 60C
  • No Missing Codes: 16bits
  • Maximum Read Rate: 1Khz - limited by I/O speed

Current Inputs

  • Input Count: 8
  • Input Range: 0 to 23mA
  • Impedance: 430Ω at 10mA. See plot below
  • Offset Error +/- 2μA
  • Gain Error: +/- 0.02%
  • Total Error: 0.05% from 4 to 20mA
  • Transient Protection Threshold: +/-10V
  • Fuse trip threshold: 50mA

Isolation

  • 1400Vpeak between each input and Raspberry Pi interface
  • 500VDC channel to channel

Raspberry Pi Interface Signals

  • SPI signals
    • CE1: pin 26 / GPIO07
    • CLK: pin 23 / GPIO11
    • MOSI: pin 19 / GPIO10
    • MISO: pin 21 / GPIO09
  • Pi-Plate Handshake Signals
    • FRAME: pin 22 / GPIO25
    • ACK: pin 16 / GPIO23

Test Data