Thermon TraceNet TCM 18 Manual de usuario descargar pdf (Pagina 71)

Permanent RTD sensors which enter the

insulation at 90 degrees may be more

sensitive to error associated with them de-

pending on insulation installation or how

well the sensor is physically attached. Ad-

just control set point to compensate for

any accuracy offset. When using a 90 de-

gree RTD probe for diagnostics, verify this

measurement technique on a known pipe

in the same general temperature range

and insulation conﬁguration.

Damaged RTD sensor. Disconnect RTD sensor and measure re-

sistance. Compare to resistance tables

for corresponding value of temperature.

Compare to pipe or equipment tempera-

ture known by another probe or sensor.

If different, the RTD sensor may need re-

placement.

Heat tracing undersized, improperly in-

stalled or damaged.

Review design/installation. Check heat

tracing for presence of proper current and

also meg for dielectric resistance. Repair

or replace heat tracing.

Heat tracing circuits are wired such that

the RTD for circuit A is controlling circuit

B, etc.

Trace and recheck ﬁeld and panel wiring.

Use circuit "turn -on " and "turn-off" tech-

nique or disconnect RTD’s one at a time to

see if the proper RTD failure alarm occurs

on the right circuit.

Heat tracing does not heat. Breaker has

been switched off due to maintenance ac-

tivities or has possibly malfunctioned.

As soon as maintenance activities cease

and after conferring with operations man-

ager, switch breaker back ON. Note that

some period of time will elapse before the

temperature alarm goes away (pipes and

equipment take time to heat up).

67 PN 50316_0514

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Thermon TraceNet TCM 18 Manual de usuario Pagina 71