205-TC Datasheet, PDF (21/22 Pages) List of Unclassifed Manufacturers – THERMOCOUPLE MINIATURE PANEL THERMOMETER

3.8 Disassembly/Assembly
You must go through the following steps in order to
remove the printed circuit board from the case if you
want to change from 115 Vac to 230 Vac (or vice versa)
or to change from Fahrenheit to Celsius (or vice versa).
These changes must be performed by a qualified
technician in order to avoid damage to the unit.
WARNING: Do not connect ac power to your meter until
you have completed all input and output connections.
Failure to do so may result in injury!
1. Remove power and all wire connections from the unit.
2. Unplug the three connectors (P1, P2, and P3) from the
back of the meter. Grasp them firmly on the top and
bottom of the connector and pull. Figure 3-9 shows the
location of the three connectors.
3. Remove the lens, mounting screws, and mounting clamp
from the unit as described in steps 1 and 2 in Section 3.
Slide the unit out of the panel (if it is installed in a panel).
4. The printed circuit board is held in place by a tab and
notch system located next to the P1 connector, pin 1
(refer to Figure 3-9). The tab is on the case and the
notch is on the edge of the PC Board. Hold the meter
with the display facing away from you. Gently pry the tab
(on the back corner of the case) out with the edge of your
finger, while pushing the back of the PC Board out
through the front of the meter. The PC Board will slide
out the front, free from the case.
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3.6 Display Hold Connections
The “Display Hold” function can be used to freeze the display.
Connect a single pole, single throw (SPST) switch between
pins 1 and 2 on the P2 connector. The display will stop
updating when this switch is on. When this switch is off, the
display will update itself 2.5 times per second.
To access the “Display Hold” function, attach copper wire to
the 3-pin female connector that is supplied with the meter.
Refer to Figure 3-6 for wiring instructions. This connector
shares a common return with the Analog Output. Plug the
female connector into the P2 connector at the rear of the
meter. Figure 2-2 shows the location of the P2 connector on
the meter.
Switch
Display Hold
RETURN
1
P2
2
3
Screws
underneath
Figure 3-6. Display Hold Connections
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