PRTXB Series RTD Process Thermometers
3
Calibration
The PRTXB is factory calibrated and there is generally no need
to alter calibration settings. Required calibration equipment
includes a temperature reference of at least four times the
unit’s accuracy, a dry-block calibrator or a temperature
controlled bath.
Calibration may be performed in any of the available
temperature units, the use of Fahrenheit or Celsius is assumed
in this procedure. Select the temperature units for calibration
prior to entering the calibration mode.
The unit enters and remains in the calibration mode until
restarted manually or power is removed. While in the calibration
mode, the auto shutoff timer is disabled, and the Min/Max
feature is disabled.
The unit is calibrated at two points, at ice point and at a
temperature above ice point.
For general service, the full scale temperature is normally used
for the second point. However, if a particular temperature is of
critical interest it may be used instead for greatest accuracy at
that point.
Enter Calibration Mode
To enter the calibration mode, begin with
the unit powered off, and press and hold the
t
button.
Then press the power button.
Release all buttons when the display
indicates CAL.
Before the unit enters the calibration mode,
the display initially indicates _ _ _ _ with the
first underscore blinking, and with CALPC on
the lower display.
Note: The unit will automatically revert to
normal operation if no buttons are operated
for approximately 15 seconds.
To cancel and return to normal operation,
press and release the power button without
entering any pass code characters.
Enter the user-modifiable pass code (3510
factory default).
Use the
s
and
t
buttons to set the left-
most digit to 3.
Press and release the power button to index
to the next position. The 3 will remain, and
the second position will be blinking.
Use the
s
and
t
buttons to select 5.
Press and release the power button to index
to the next position. 3 5 will remain, and the
third position will be blinking.
Use the
s
and
t
buttons to select 1.
Press and release the power button to index
to the next position. 3 5 1 will remain, and
the fourth position will be blinking.
Use the
s
and
t
buttons to select 0.
Press and release the power button to
proceed with calibration.
Note: If an incorrect pass code is entered, the
unit will return to the start of the pass code
entry sequence.
Calibration Procedure
Upon successful pass code entry, the
upper display will indicate the RTD probe
temperature. The lower display will alternate
as indicated below.
Note: To store the calibration parameters
and exit calibration mode at any time, press
and hold the power button until the display
indicates - - - -.
Ice-Point Calibration
When the applied temperature is below
approximately 12 °C (or 54 °F), the unit will
automatically select the ice-point calibration
mode.
Apply 0.0 °C or 32.0 °F to the RTD.
The lower display will alternate between ICE
and DEG C or DEG F.
Use the
s
and
t
buttons to adjust the upper
display to indicate 0.0 °C or 32.0 °F.
Span Calibration
Apply full-scale temperature to the RTD.
The lower display segments will alternate
between CAL and DEG C or DEG F.
Use the
s
and
t
buttons to adjust the upper
display segments to indicate the applied
temperature value.
To store the calibration parameters and exit
calibration mode, press and hold the power
button until the display indicates - - - - .
Changing the Pass Codes
The factory default pass code of 3510 may be changed if
desired. Separate pass codes may be used for min/max
configuration access and calibration access.
Configuration Pass Code Access
With the unit off, press and hold the
s
button.
Then press the power button.
Release all buttons when the display
indicates CFG.
Calibration Pass Code Access
With the unit off, press and hold the
t
button
to view and/or change the user calibration
pass code.
Then press the power button.
Release all buttons when the display
indicates CAL.
View/Change Pass Code
Before the unit enters the view or change
pass code mode, the display initially indicates
_ _ _ _ with the first underscore blinking,
and with CFGPC or CALPC on the lower
display.
Note: The unit will automatically revert to
normal operation if no buttons are operated
for approximately 15 seconds.
To cancel and return to normal operation,
press and release the power button without
entering any pass code characters.
Enter Access Code 1220
Use the
s
and
t
buttons to set the left-
most digit to 1.
Press and release the power button to index
to the next position. The 1 will remain, and
the second position will be blinking.
Use the
s
and
t
buttons to select 2.
Press and release the power button to index
to the next position. 1 2 will remain, and the
third position will be blinking.
Use the
s
and
t
buttons to select 2.
Press and release the power button to index
to the next position. 1 2 2 will remain, and
the fourth position will be blinking.
Use the
s
and
t
buttons to select 0.
Note: If an incorrect access code was
entered, the unit will return to the start of the
access code entry sequence.
Press and release the power button to
proceed.
The display will indicate the existing user-
defined pass code with CFGPC or CALPC on
the lower display. To exit without changes,
press the power button.
Operate the
s
and
t
button to select
the first character of the new pass code.
Characters 0-9 and A, b, C, d, E, F may be
used.
When the correct first character is being
displayed, press and release the power
button to proceed to the next pass code
character.
Repeat above until the entire pass code is
complete.
To exit the view or change pass code mode,
press and hold the power button.
Release the button when the display
indicates - - - - to restart the unit.
- - - -
t
s
*
Press to save and
restart
ice
32.0
t
s
deg F
*
*
or
Increment up
or down
cal
392.0
t
s
*
*
or
Increment up
or down
deg F
- or -
cf6
t
s
Release buttons
t
s
*
2
*
1
cfgpc
____
t
s
cfgpc
i___
t
s
*
*
or
*
Increment
up or down
Move to
next #
cfgpc
i220
t
s
*
*
or
*
Increment
up or down
Move to
next #
cal
t
s
Release buttons
t
s
*
2
calpc
____
t
s
*
1
cal
t
s
Release buttons
t
s
*
2
*
1
calpc
____
t
s
calpc
3___
t
s
*
*
or
*
Increment
up or down
Move to
next #
calpc
35 i0
t
s
*
*
or
*
Increment
up or down
Move to
next #
calpc
35 i0
t
s
*
Press to enter
calibration mode
def F
75.0
t
s
cal
cfgpc
35 i0
t
s
*
*
or
*
Increment
up or down
Move to
next #
cfgpc
A250
t
s
*
*
*
Increment
up or down
Move to
next #
cfgpc
A250
t
s
*
Press to save and
restart
cfgpc
35 i0
t
s
*
Press to enter pass
code configuration
mode
