DFM 6.1 INSTRUCTION MANUAL
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Yes. Our Doppler’s design allow cable lengths up to 500 ft (152 m) with no loss of signal strength. Extended cable
(Option DXC) should be installed in rigid or flexible conduit for mechanical protection. Use only our shielded
coaxial pair (RG174U) cable. Cable junctions should be made through a terminal block and housed in a watertight
metal junction box (Option ‘JB2X’). BNC coaxial connectors (TV cable type) are not recommended for cable splices.
Does the DFM 6.1 require periodic recalibration?
DFM 6.1 calibration does not drift over time. The solid-state sensor has no moving parts to wear and affect
calibration. The Doppler flow technique generates an ultrasonic signal proportional to the velocity of flow. All
timing/counting circuits use crystal-controlled frequency references to eliminate any drift in the processing
circuitry.
ISO 9000 or similar quality management systems may require periodic and verifiable recalibration of flow meters.
DFM 6.1 Doppler Flow Meters may be returned to Pulsar Measurement for factory calibration and issue of a new
NIST traceable certificate. Refer to the ‘Product Return Procedure’ section of this manual for return instructions.
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