TTFM 6.1 INSTRUCTION MANUAL
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COMMON QUESTIONS AND ANSWERS (cont.)
What is the purpose of the Signal Strength Display?
The primary function of the signal strength display is to assist as a feedback when mounting sensors. Signal
Strength can also be a useful diagnostics tool when troubleshooting problems with an installation. A signal
strength less than 100% may indicate a problem with the installation or other issues such as a mis-programmed
pipe size, pipe material, fluid type or temperature, or wrong transducer spacing. A signal strength less than 100%
may also simply indicate a lot of aeration, or deteriorated pipe. Consideration should be made to use a 1 cross
installation in such a case.
Can I change the length of the sensor cable?
Yes. The Transit Time design allow cable lengths up to 100 ft (30 m) or extension up to 250 ft with extra cable and
JB2X optional junction box. Replacement cable of different length may be installed in rigid or flexible conduit for
mechanical protection. Use only our shielded triaxial cable.
Does the TTFM 6.1 require periodic recalibration?
TTFM 6.1 calibration does not drift over time. The solid state sensor has no moving parts to wear and affect
calibration. 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.
TTFM 6.1 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.
