Parr Instrument Primary Temp User Manual
No. 561M
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1. Unplug the power cord of the 4838 controller. Remove the (2) screws located on
the top corners of the rear panel on the controller. Gently lift the cover, which is
hinged at the bottom, forward taking care not to apply tension on any wiring
internally.
2. Make a note of where the wires are
installed on the existing primary
temperature meter. The pin numbers are
printed on the back of the meter itself.
They should match the Pin Out table on
the next page. Using tape to designate
each wire, record the pin number each
wire is attached to.
3. Using a Phillips screwdriver, remove the
wires from the back of the primary
temperature meter.
4. Using a Phillips screwdriver, remove the two screws on the top and bottom
mounting brackets. Pull the meter out.
5. Insert the new meter through the panel cutout, from outside in, making sure the
rubber gasket is on the outside of the
controller front panel. Slide the mounting
brackets onto the meter with the mounting
screws pointing towards the front panel.
Slide the mounting bracket forward until it
touches the controller panel. The clasps
on the mounting brackets should align
with the grooves on the meter. Gently
tighten the screws until the meter is held
into place.
6. Connect the free wires (disconnected in
step 3) to the new meter. Check the positions carefully and refer to the Pin Out
table.
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Meter installation in 4838 Reactor Controller
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Back of Primary Temperature Meter
Back of Primary Temperature Meter
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- 1 -
PTM Installation in a 4838
Pin Out Table:
2083E
Meter
Pin 1 Purple SSR 4/A2Pin 2 Red SSR +3/A1
Pin 3 Red (RTD Only) Thermocouple Pin 4 White* Thermocouple +
Pin 5 Red** Thermocouple - 1G
Pin 6
Pin 7
Pin 8
Pin 9 Black COMM PORT - pin 5
Pin 10 White COMM PORT - pin 3
Pin 11 Black Terminal Block 4
Pin 12 White Terminal Block 2
Pin 13
Pin 14 Orange
Pin 15 Blue Terminal Block 3
Color: Attaches to:
High Limit Reset - pin
2
* White (Type - J), Yellow (Type - K), Blue (Type - T), Black (RTD)
** Red (Type - J, Type - K, Type - T), White (RTD)
Wiring Schematic
- 2 -
PTM Installation in a 4838
Final Steps:
Close the controller and replace the two screws on the back plate. Plug the 4838 Controller back
in and turn it on. The display should show room temperature with the thermocouple connected.
It is useful to check that the settings on the display are set correctly. Check these against the
Factory Default Settings.
- 3 -
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