HomeGas AnalysersSafety › Oldham MX 43 Analog and Digital Controller

Oldham MX 43 Analog and Digital Controller

  Analog and digital controller
  4 or 8 lines, up to 32 detectors
  Up to 32 fully programmable relays (OR, AND, NAND, NOR, Voting functions)
  Large graphic display
  Remote modules (cost savings on wiring installation)
  USB Data logging capability
  RS485 Modbus RTU and multiple analog outputs

Oldham's MX 43 is a fully scalable analog and digital controller that has been designed to continuously measure and control gases in the atmosphere.

Both digital lines and analog channels are managed using the MX 43 gas detector. This covers all needs for a wide variety of gas monitoring applications. Up to 32 detectors can be distributed on 8 lines using MX 43 digital technology. This permits increased cost savings.

Data Sheet


Operating use

Operating temperature -20C to +50C
Storage temperature -20C to +50C
Humidity 5 to 95% RH
Power 100-240 Vac 50-60 Hz or 21-28 Vdc, 112 W max
Battery Embedded back up power supply in option (0.6 Ah)
Consumption 500 mA min (without module)

Measurement lines

Digital lines 8 maximum / RS-485 communication, proprietary protocol, 9600 Baud / 2 twisted shielded-pair cable
Analog channels 8 maximum / 0-23 mA analog signal input (4 to 20 mA reserved for measurement) / 120 Ohm load resistance / 2 or 3-core shielded cable
Voltage (typical) 21 to 28Vdc
Maximum current output per line 1.2 A (1.5 A intermittently)
Maximum current output in total 2.4 A permanent (3.2 A intermittently)


Per channel 5 alarm levels (A1, A2, A3, Overscale, Underscale) + Fault / Non-ambiguity reading option for combustible gases monitoring
Programmable thresholds On instantenous ou averaged values, rising or falling alarms, manual or automatic acknowledgement
On-board relays 5 fully programmable alarm relays / 1 fault relay (non-configurable) / Dry contact relay / DPCO relays with contact rating of 250 Vca 2 A (inductive)
Digital outputs RS-485 Modbus RTU serial link


EMC According to EN50270
ATEX EN50271 and metrological performances according to EN60079-29-1
Low Voltage Directive According to EN61010
CSA Pending
MTBF 20 years (4 lines, powered with 24 Vdc) / 17 years (8 lines, powered with 24 Vdc)
MED According to Marine Equiment Directive 96/98/EC. Fulfills the EMC requirements for installation in General Power Distribution Zone and/or Deck Zone.

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

Back To Last Page

Oldham Fixed Gas Detection

MX 43 Analog and Digital Controllers

OLCT 10 and OLC 10 Toxic / Flammable Gas Detectors

OLCT 60 Gas Detector

OLCT 80 Wireless Transmitter

OLCT 100 and OLC 100 Fixed Gas Detector

Want A Quotation?

Please fill out the following fields and we will e-mail you a quotation shortly.