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DM 650LP

Loop Powered Indicator With Data Logging, Alarm & Message Display

  • (4 to 20) mA loop powered
  • Built in change over relay for alarm
  • Surface or temperature probe mounted
  • 5000 point datalogger
  • Battery back up for datalogger
  • Housing ABS plastic or Stainless Steel


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The DM650LP loop powered process switch and indicator. It accepts a (4 to 20) mA signal and displays the process value in the appropriate engineering units on a 6-digit LCD display. The instrument offers an advanced display mode allowing the user to also display one or two (1 to 32) character messages.

Additional to the messages, the user may select an alert event to occur when the temperature is within a band. The change-over relay can be used together with the messaging and alert to provide switching at user set switch points.

In addition to this, an on board datalogging function is also available to record process details. In this case a battery needs to be fitted so the log can continue to be monitored in case of loop failure.  Battery life 2-year minimum (longer depending on options selected).

The product can be wall or sensor mounted.

LOOP POWERED The instrument is powered by the loop current. A single AA 3.6V lithium battery is also fitted to allow display function and datalogging to continue on mA loop current loss. This is useful for displaying error messages and maintains the log function, allowing the user to determine the loop loss period.

RELAY TRIP The instrument is equipped with a volt-free changeover-type relay. The user may select one of several actions, including deviation operation, with adjustable set point and hysteresis. The Relay may be turned off if not required. An option is provided to trigger a display alert-event when the relay contact is on.

DATA LOGGING FUNCTION  The number of log points can be set up to 5000; each point is time and date-stamped together with input process value (PV) and relay state information. The log rate is selectable in steps. The start of log can be delayed if required. Either fixed or rolling logs may be performed.

Two methods of reading the log are available. USB interfaced software reads the log and allows the user to save to a text file for export to other programmes. The NFC android interface allows data transfer to compatible android phones or tablets by using the downloadable App.

TEMPERATURE TRANSMITTER COMPATIBLE As well as working with any (4 to 20) mA signal the DM650LP has space inside its housing to mount a Status Instruments (4 to 20) mA temperature transmitter. Our range of temperature transmitters can be used with the DM650LP in the SCH4 or SCH15 housing to give a local temperature display.