STI Vibration Monitoring, Inc. Vibration Monitoring & Machine Protection Systems
1010 East Main Street, League City, TX 77573 /
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CMCP549 Valve Position Transmitter/Monitor

Field Application Note: Differential Expansion TSI
Valve Position Transmitter


  • Low Cost
  • Small Size
  • DIN Rail Mount
  • 4-20 mA Output
  • Fault Detection
  • Buffered Transducer Output
  • CE Approved Approved

Download the Datasheet in PDF Format Download the Manual in PDF Format CSA / UL Hazardous Area Approved

CMCP549 Valve Position Transmitter

CMCP500 Transmitter Approval Label


The CMCP549 Valve Position Transmitters are compatible with rotary potentiometer (resistance) inputs, they provide a 4-20 mA output proportional to the overall measurement. Each unit provides power for the associated transducer, processes the signal, and outputs a 4-20 mA dc current that is proportional to a user specified range such as 0-100%. Combining transmitters with an existing PLC or DCS system results in a high density, low cost vibration monitoring system. When specified with the alarm feature (CMCP549A), the unit functions as a complete single channel monitor that includes alert and danger alarms, and output relays.

Alarms relays and trip multiply are available with the Monitor version.

Alarms - The CMCP500A Series Monitors have two independent set points, with LED alarm indicators and output relay contacts (Alert and Danger). Set points are adjustable via potentiometer, from 0 to 110% of full scale. Each has an adjustable delay of 1 to 10 seconds. SPST Relay contacts are rated 5 Amps @ 30 Vdc or 250 Vac for resistive loads.

Relay contacts can be independently configured by the user for either Normally Open (NO) (Standard) or Normally Closed (NC) operation. Relays are normally de-energized and can be configured for latching or non-latching (standard) operation. Latched alarms may be reset locally or by remote contact closure.

Trip Multiply - The monitors have set point multiplication of 3X via contact closure (2X available). To avoid tripping the alarms during machine start-up.

Buffered Output:

A BNC connector mounted on the front of the unit provides access to the buffered transducer output signal. This includes both the unfiltered vibration signal, and the DC bias voltage. Portable test equipment or analyzers like SKF-CM's Microlog™ can be connected to this output without disturbing other system outputs.

Fault Detection:

On board fault detection circuitry continuously monitors the transducer for normal operation. If a fault occurs, the output current is reduced to 2 mA to indicate the fault to the readout system. A red LED on the front of the unit is turned on to provide a local indication of the fault.

Displays And Assemblies:

Various display options, NEMA and explosion-proof enclosures, and assembled multi-channel systems are available. Consult your sales representative.

Monitoring Systems

Electrical Specifications:

  • Power: +24 Vdc @ 45 mA max. (30 mA typical at 2 full scale output). Reverse polarity and transient protection   included.
  • Buffered Output: BNC Connector
  • Accuracy: 5.0 % of Full Scale Range
  • Output: 4-20 mA proportional to the full scale range
  • Maximum Load: 600 Ohms Resistive
  • Case: Isolated

Environmental Specifications:

  • Operating Temp.: -20°C to +80°C (-4°F to +176°F)
  • Storage Temp.: -55°C to +125°C (-67°F to +257°F)
  • Relative Humidity: 0 - 95% Non-Condensing


32 mm (G style) or 35 mm (T style) DIN Rail

Ordering Example:

To order a standard valve position transmitter that accepts input from a 0-5,000 Ohm potentiometer with a Full Scale of 0-100%, specify Part Number: CMCP549-01-01.


1.The Full Scale option specified at order entry is used by the factory for initial calibration. However, several other ranges can be jumper selected in the field.

2.Transducer and Full Scale options not listed in the above table are available. Contact your sales representative.

Ordering Information:

Valve Position Monitor/Transmitter CMCP549

CMCP549, Valve Position Transmitter
CMCP549A, Valve Position Monitor

(aa) Input

01, 0-5,000 Ohm Potentiometer

(bb) Full Scale

01, 0 to 100%


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