MX 32 Analogue And Digital Controller

The Oldham MX 32 is a controller that takes analogue and digital inputs. It covers all needs for a variety of applications.


The Oldham MX 32 Analogue and Digital controller is a compact, low-profile controller that continuously monitors gas detection and more generally any 4-20 mA, MODBUS RS485 signal from compatible detectors.

The MX 32 digital technology allows up to eight detectors to be distributed on two lines for increased cost savings.

The system primarily compromises of 
  • a MX 32 ( 1 or 2 lines)
  • different modules
The Oldham MX 32 instantly handles the measurements of detectors and input modules. As soon as the measurements reach configured threshld, the internal buzzer and the LED indicators go off. At the same time, the corresponding relays are activated to drive the additional actions programmed by the user. 
For more information about the Oldham MX 32 Analogue and digital controller, contact Air-Met Scientific today. 


Features of the Oldham MX 32 Analogue and Digital Controller Include: 

  • Analogue or digital controller
  • Up to 8 detectors
  • Fully scalable
  • 5" LCD back-lit graphic display
  • Five programmable events per detector
  • Smart kes make embedded multi-language menus simple to use
  • Lockable toggle latch
Dimensions (wall-mounted version) 
265 x 266 x 96 mm (10.4 x 10.5 x 3.8 inches
Ingress protection IP55
Cable entries (wall-mounted version)
5 M16 cable glands, 4 to 8 mm² (8 to 11 AWG) outer diameter cable
2 M20 cable glands, 6 to 12 mm² (7 to 9 AWG) outer diameter cable
LCD back-lit display + smart keys
Display in video inverse in case of fault
Customizable by user (display 1 to 8 channels simultaneously, fixed or scrolling, on events...)
Bar graph with alarm threshold
Visual indicators
7 LEDs per line
1 LED fault indicator
1 LED fault indicator
5 smart keys
1 audible alarm accept/reset button
MX 32 Operating Use Specifications
Operating temperature 
-20°C to +50°C (-4°F to +122°F)
Storage temperature 
-20°C to +50°C (-4°F to +122°F)
Humidity 5 to 95% RH
Power 100-240 Vac 50-60 Hz (35W) or 22-28 Vdc (92 W)
250 mA min (without module)
MX 32 Measure Lines
Digital lines
2 maximum
RS-485 communication, proprietary protocol, 9600 Baud
2 twisted shielded-pair cable
Analogue channels
2 maximum (4-20mA or Wheatstone Bridge)
0-23 mA analog signal input (4 to 20 mA reserved for measurement)  or type OLC 10, OLC 10
Twin and OLC 100 flammable gas detectors (Wheatstone bridge type)
120 Ohm load resistance
2 or 3-core shielded cable detector dependant
Output Voltage 21 to 28Vdc (external)
Maximum current output per line 0,65 to 1 A with internal AC power or 1.5A with external DC powered
Maximum current output in total 0,65 to 1 A with internal AC power or 2x1.5A (with external DC power)
MX 32 Alarms
Per channel
5 alarm levels (A1, A2, A3, Overscale, Underscale) + 1 Fault
Catalytic bead over range protection
Programmable thresholds on instantenous or averaged values, rising or falling alarms, manual or automatic acknowledgement
MX 32 Output
On-board relays
4 fully programmable alarm relays + 1 fault relay (non-configurable)
Dry contact relay, DPCO relays with contact rating of 2A / 250 Vca -30Vdc
External relays
Up to 16 fully programmable alarm relays
Dry contact relay, DPCO relays with contact rating of 2A / 250 Vca -30Vdc
Digital outputs RS-485 Modbus RTU
Analog outputs Up to 8 output (4-20mA)
MX 32 Approvals
According to EN50270:15
Low Voltage Directive According to EN61010-1:10
SIL1 According to EN50271:10 (pending)

Applications for the MX 32 Analogue and Digital Controller Include: 

  • Mining
  • Marine
  • Confined Space
  • Fire/Hazmat
  • Utilities
  • Refineries