2.4
TRACE
MATE-277V
Chapter 2 Installation
You must install the RTD sensor on the pipe surface or
thermal well before the pipe insulation to ensure proper
thermal contact. The RTD position should be 180° from
the electric heat trace cable which is the coldest spot of
the pipe. The RTD sensor may be secured to the pipe by
fiber-glass tape. If additional wiring is required for the
RTD, shielded 3-lead wire sized 18 or 20AWG must be
used for the RTD sensor to minimize the effects of noise
pickup. A typical RTD installation is shown in Figure 2.4.
Alarm Wiring
TraceMate-277V has a form c dry alarm and an active
alarm output for driving an LED alarm indicator. The
alarm LED output is configured to turn on the alarm
indicator when there is no alarm. Refer to Figure 2.2 for
alarm output terminals.
The form c dry alarm contact is rated 0.1A 30Vdc.
The alarm LED output is rated 6Vdc, 50mA. It can drive
a 6Vdc LED indicator.
These alarm contact and output are designed as interface
to annunciator, PLC, DCS, or panels.
Figure 2.5 Enclosure and Mounting Dimensions
Warning - Explosion Hazard - Substitution
of components may impair suitability for
Class 1, Division 2 or Class 1, Zone 2.
Warning - Explosion Hazard - Do not
disconnect equipment unless power has
been switched off or the area is known to be
non-hazardous.
