Electronic Display Unit »EDU 32 FP«

Table of Contents


The EDU 32 FP accessory is a microcomputer-controlled counter and display apparatus. It is designed to be used in conjunction with RITTER Gas Meters, to count and display the absolute volume and flow-rate of gases flowing through the Meter. It consists of a unit in a separate (desktop) casing with a two-line Plain-Text-LCD-Display.

The following individual alterations and functions can be programmed via the Control Buttons:

  • Gas Meter type being used
  • Individual measurement range (min./max. flow rates) for custom-built Gas Meters
  • Upper and lower limiting values for Flow Rate
  • Pulse Generator in use:
    • Standard (200 Pulses per revolution of the measurement drum)
    • Ex-Proof (50 Pulses/Revolution)
    • 2 x 200 Pulses (forward/backward)
    • 500 Pulses per revolution of the measuring drum
    • Custom-built Models (customer-preferred number of pulses under 200 or 50 respectively)
  • Language German/English in the Display
  • Analog-Output: Current Output or Voltage Output
  • Contrast adjustment of the Display

Standard Adjustment Specifications

If the EDU 32 FP is ordered together with a Gas Meter, or ordered separately but with notification included of the type of Gas Meter with which it will be used, it will be delivered to the Customer already programmed for that Meter. If ordered separately with no such notification, it will be programmed to the following standard specifications:
  • Gas Meter Type: TG 05
  • Sensor Type: PG 3.2
  • Language: English
  • Output Signal: 4 – 20 mA
  • Current Out: OFF

Point 6 of the EDU Manual explains how the Display Unit can be programmed for other adjustments, should these be required.

Technical Data

Power supply

  • either 110 V / 60 Hz or 230 V / 50 Hz (must be specified with order)
  • Over-/undervoltage:
    • +15%
    • -5% (with Current Output »On«)
    • -20% (with Current Output »Off«)
  • 6 Volt Accumulator for battery operation
  • Standard power socket, power cord


  • Large 2-line LCD Display, 16 characters per line
  • Display language programmable: English / German
  • Display contrast adjustable (via the Menu)
  • Display of:
    • measured Gas Volume in (Liters)
    • actual Flow Rate in (Liters per hour)
    • programmed Gas Meter type/model
    • power status (Mains / Battery / Low Batt)


  • Interface RS 232 (Standard Sub-D-9-pin-socket):
    • Signal: +/- 15 Volts
    • Transmission rate: 9,600 Baud
    • Data = 8 Bit, Parity = N, Stopbit = 1
  • Analog Output, programmable, round 5-pin-socket:
    • Current Output: 4 – 20 mA or 0 – 20 mA
    • Voltage Output : 0 – 1 Volt


  • Pulses from Pulse Generator built into Gas Meter, round 5-pin-socket suitable for all RITTER Drum-type Gas Meters and Bellows-type Gas Meters (Type and Model programmable via the control buttons).

Further Functions

  • Data transmission via RS 232 to a PC
  • Configuration of the EDU 32 FP from the PC
  • Pre-selection of a minimal or maximal Flow Rate
  • Acoustic Signalling (Beep) when the Flow Rate values exceed the pre-selected min./max. range
  • Power supply for the power interface can be turned off (to in-crease the running time during battery operation)

Control Codes

(for data transmission from Interface RS 232 to Computer)

  • Ctrl-V (Hex 16) provides: VOL 00000,00 LTR
  • Ctrl-F (Hex 06) provides: FLOW 000,00 L/H
  • Ctrl-C (Hex 03) causes: RESET
  • Ctrl-T (Hex 14) provides: Type + Power Status

Control elements

  • Push-buttons, waterproof
RESET(in measurement mode): Resetting the Display to zero
ENTER(in set-up mode): For scrolling through provided Menu Options and saving of selected option
MODE(in measurement mode): Choice of Display »Volume« and/or »Flow Rate«
SELECT(in set-up mode): For selection of required Menu Option


  • Dimensions (W x D x H): 155 x 200 x 120 mm
  • Weight: 1.4 kg
  • Temperature Range: 0 °C to + 50 °C


  • 0.1 Ampere, located at the rear wall in a fuse drawer below the power socket. The fuse drawer contains a spare fuse as well.

Scope of supply

  • Power cord (with delivery into countries with German Standard for socket / plug only)
  • Connection cord to Pulse Generator

V 5.2 / Rev. 2024-04-19 / Subject to alterations.