1734 Carbon Transmitter with Controller

1734 Carbon Transmitter with Controller

Accurate Measurement of the Carbon Potential in Furnaces used for Heat-Treating of Metal

Using an in-site probe to accurately measure the carbon potential in real-time means the correct level of carburizing is achieved first time every time, saving expensive re-work and increasing productivity.

The Novatech 1734 controller works with a variety of gasses including;

  • Propane
  • Methane
  • Nitrogen / Methanol

The 1734 Carbon Controller is designed specifically for industries operating heat-treatment furnaces

Designed to accurately measure and control carbon potential in furnace atmosphere, it can operate as a stand-alone unit or be integrated into automated control systems.

Real-Time Measurement of Dew Point and Carbon Potential

While Dew Point measurement is commonly used to monitor heat-treatment furnaces, this only tells part of the story.  In order to relate dew point back to carbon potential, lookup tables are needed to cross-reference dew point and furnace temperature.

The 1734 Carbon Controller calculates Carbon Potential automatically in real-time eliminating human error and the need for lookup tables.  Carbon Potential is conveniently displayed on the local display, and can be re-transmitted via analog or digital communications so it can be monitored from a central control panel.

The 1734 Carbon Controller is able to operate as a Stand-Alone Controller, and is Ideal for Integration

The 1734 Carbon Controller is highly adaptable with integration in mind.  It has several output modes that can be used trim combustion gas to an optimal carbon potential.

Key Features at a Glance

Two isolated user scalable 4-20mA analog outputs that can re-transmit information such as carbon potential, dew point, oxygen or temperature.

Four voltage free relay contacts that can be programmed to trigger on range of alarm conditions or at process related thresholds.

Digital serial communications using the standard Modbus™ protocol.

Dual Probe Control with Redundancy

The 1734 Carbon Controller can be configured with two separate in-situ probes which eliminates the need to shut down the furnace in the event of a single probe failure.  The failed probe can be removed from the furnace and replaced with a new probe without stopping production.

The Novatech 1734 tells you what’s happening

All process related information and alerts can be viewed on the local display, as well as being re-transmitted using a range of fully programmable analog outputs, voltage free alarm relays or Modbus™ digital serial communications.

Operators are alerted to any failures or process related alarms with descriptive messages on the transmitter’s local display.  Alarms can also be used to trigger internal relays that can be wired to external indicator lamps and buzzers and alarm states can also be monitored via digital communications.


  • One or two zirconia oxygen probes or sensors
  • One zirconia sensor & auxiliary thermocouple type J, K, R, S or N
  • Burner “On” signal (dry contact)
  • Purge air flow switch


  • Four programmable alarm relays
  • Two isolated 4-20mA or 0-20mA
  • SSR outputs to purge & calibration check gas solenoid valves

Range of Outputs

  • Carbon:
  • 0 to 1.5%
  • Average Carbon:
  • 0 to 1.5%
  • Probe EMF:
  • 0 to 1500mV
  • Probe TC Temperature:
  • 0 to 1600°C
  • Oxygen %:
  • 0 to 25%
  • Reducing Oxygen:
  • 10-30 to 102 %
  • Aux TC Temperature:
  • 0 to 1600°C


  • Common alarm relay with 20 user selectable instrument alarm functions
  • Three Programmable process alarm relays
    • Carbon Low
    • Carbon High
    • Carbon Deviation
    • Probe Temperature Low
    • Purge in Progress
    • Carbon Invalid
    • Any alarm condition not selected for the common alarm
  • Multiple selections can be made for all relays

Alarm Contacts

  • Normally open failsafe (open for alarm state)
  • 240VAC / 30VDC, 2A

Range of Local Indication

  • 0.00 to 2.00% Carbon Potential

Network Interface

  • RS-485 MODBUS™

Secondary Parameter Display

  • Probe 2 Carbon %
  • Average Carbon %
  • Probe 1/2 TC Temperature
  • Probe 1/2 EMF
  • Probe 1/2 Impedance
  • Probe 1/2 Oxygen %
  • Auxiliary TC Temperature
  • Ambient Temperature
  • Ambient RH%
  • Controller Set Point
  • Runtime
  • Service Date
  • 4-20mA Output 1
  • 4-20mA Output 2

Options available will vary depending on device configuration


  • ± 1% of the actual oxygen reading with a repeatability of 0.5%. For example, at 2% oxygen the accuracy would be ±0.02% oxygen.

Environmental Rating

  • Operating Temperature -25°C to 55°C
  • Relative Humidity 5% to 95% (non-condensing)
  • Altitude 2000m Maximum

Power Requirements

  • Mains Voltage 100 to 240VAC -6/+10%, 50/60Hz
  • Overvoltage Category II (IEC60364-4-443)
  • Requires 5W for controller plus probe power

Degree of Protection

  • IP65
  • IP54 with internal reference air pump


  • 315mm W x 190mm H x 110mm D


  • 3.3kg (7.3lb)
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