controller, respectively. Detailed information regarding their adjustment is given
later in the ADJUSTING THE CONTROLLER section.
LOWER RIGHT (Display Mode)
The position of the SLIDE SWITCH (Fig. F) determines what the LED
display will show. At the center position, the display indicates the temperature as
measured by the probe tip, and the red TEMP LED (Fig. C) at the lower left of the
instrument will be illuminated. Sliding the switch up or down will cause the
display to show the high and low controller setpoints, respectively.
UPPER RIGHT (Controller Status LED’s)
There are a total of 4 LED’s here. The upper row (Fig. G) shows the status
of the 110 VAC outlets on the back of the controller beneath the LCD pH display.
The lower LED lights (Fig. H) are on when the display mode switch is in the HIGH or
LOW position.
110 VAC OUTLETS
There are two outlets located above the LCD display. Outlet #1 (on the
left) will be energized when the temperature is above the High setpoint, and Outlet
#2 (on the right) will be energized when the temperature is below the Low
setpoint. A common application for the controller will be to control a chiller OR a
heater, or a chiller AND a heater. Since the addition of chiller lowers the
temperature you must attach the plug of the chiller to Outlet #1. If a heater is
attached to the controller, it should be plugged into the LOW control Outlet # 2.
A temperature electrode is supplied with the controller. The probe cable
is ozone resistant silicone. Attach the temperature probe to the BNC connector on
the controller. Replacement temperature probes are available.
IV. PROPER PLACEMENT OF THE TEMPERATURE PROBE
When the controller is operational, it is critical that the probe tip is
immersed in the system at all times. If the water level falls below the sensing tip
of the electrode, the temperature probe will not read properly. If the erroneously
measured temperature is higher than the controller setpoint, the chiller connected
to that outlet will remain permanently ON, irrespective of the actual system
temperature.
Take some time to determine how much the fluid level around the probe
will fluctuate. Adjust the position of the probe accordingly.
Be sure to check the probe position occasionally. Complacency usually
sets in when you feel that “Everything is running fine”.
V. ADJUSTING THE CONTROLLER SETPOINTS
The PINPOINT Temperature Controller is capable of controlling temperature within
the range of 60.0° F to 102.0° F. After the selection of the High and Low
temperature setpoints, the Range screw will create a differential or cushion of
±0.5° F to ±10.0° F above and below each setpoint.
Two adjustment screws on the front panel determine the controller
Temperature setpoints. The right adjustment screw (Center Value Fig. E) should be
adjusted to set the optimal temperature. The left adjustment screw (Range Fig. D)
is used to create the differential both above and below your optimal temperature
setpoint.
Turn the Range screw toward minimum to create the most stable
temperature environment and increase this setting toward maximum to create a
greater cushion around the optimal temperature setting.
Adjusting the Controller Setpoints
When using the PINPOINT Temperature Controller with a chiller put the switch to
the High position. Turn the Range screw toward the Minimum setting as much as
possible for maximum temperature stability. Now adjust the Center Value screw to
select the optimal temperature of your system. Attach the chiller to outlet #1.
Place the selector switch in the middle position to read temperature.
When using the PINPOINT Temperature Controller with a heating device put the
switch in the Low position. Turn the Range screw toward the Minimum setting as
much as possible for maximum temperature stability. Attach the heater to Outlet
#2. Place the selector switch in the middle position to read temperature.
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