HART Signal Detector
Traditional 4-20mA HART uses a modulated audio-band communication signal based on the Bell 202 standard. Bell 202 is used today to transmit Caller ID information between the first and second rings on your telephone. Audio-band means you can hear the signal. The HART Signal Detector allows you to connect to a HART network and listen to the HART communications.
To aid in recognizing HART communications, three audio samples of communications on various HART networks are provided below. Right-click on each file to download and then listen using your default audio application.
99091603.wav - MTL primary requester, handheld communicator secondary requester, Bailey PTH responder, no burst
99101803.wav - Arcom HPORT primary requester talking to Bailey responder, no burst
99101805.wav - Pepperl + Fuchs requester, Rosemount 3044C responder, in burst mode
Use Instructions
- Plug the earphones into the HART Signal Detector
- Press either of the buttons to turn the unit on
- Adjust the volume to LOW by pressing the down button
- Connect to the HART loop; the leads should be connected to each terminal of the field device or across the loop’s current sense resistor
- Put earphones on and slowly turn the volume up to listen to the HART signal
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LED will blink when HART Signal is present
Note: Large EMI/RFI transients may affect volume or cause a short reset. (Any large transient will not result in a failure.)