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Page 59
TTFM 6.1 Transit Time Flow Meter
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 Greyline 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 Greyline 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 Greyline 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 Greyline for factory calibration and issue of a
new NIST traceable certificate. Refer to the ‘Product Return Procedure’ section of this manual for return
instructions.
Содержание TTFM 6.1
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Страница 5: ...Page 5 TTFM 6 1 Transit Time Flow Meter 100 240 VAC Meter CONNECTIONS ...
Страница 27: ...Page 27 TTFM 6 1 Transit Time Flow Meter TYPICAL SENSOR INSTALLATION ...
Страница 53: ...Page 53 TTFM 6 1 Transit Time Flow Meter SENSOR MOUNTING COUPLING RECOMMENDATIONS ...