Description
The PRTXB series is microprocessor controlled industrial RTD
temperature indicator with a digital temperature display in a
rugged NEMA 4X housing.
The temperature reading is linearized for the digital display. The
temperature display may be set up to read °F, °C, or kelvin and
the auto shutoff time may be set as needed.
The unit is capable of automatically capturing and storing
maximum and maximum readings. The min/max functionality
can be set up as required, and the readings can be either saved
or cleared when the unit shuts off.
Installation and Precautions
Read these instructions before installation. Configuration may
be easier before installation.
The spring-loaded versions must be used with a thermowell.
Use a thermowell appropriate for the process.
The non-spring-loaded versions can be used in non-pressurized
applications or applications with no flow. Due to the hardness of
316 stainless steel, it is recommended that a thread sealant be
used to ensure leak-free operation.
Do not exceed maximum allowable housing temperature.
Install or remove using wrench on probe hex fitting only. Do not
attempt to tighten or loosen by turning the housing.
Operation
Press and release the power button to power
up the unit. The unit tests all LCD segments
and displays the RTD temperature on the
upper display and the temperature units on
the lower display. Readings are updated
approximately 4 times per second.
The RTD probe has a time constant of
approximately 10 seconds, typical of an RTD
probe in a stainless sheath. Time constant is
characterized as the RTD changing to 63.2%
of its new temperature span in one time
constant, and 95% of its new temperature
span in three time constants.
If the unit is configured with an auto shutoff
time, a five second warning period is
provided prior to auto shutoff, during which
the display indicates OFF. The auto shutoff
timer is reset whenever any button is pressed
and released.
To shut off the unit manually at any time,
press and hold the power button until the
display indicates OFF (up to about 5 seconds
total if MAX/MIN is enabled) and then release
the button.
Out-of-Range Indications
If the RTD temperature goes above 392°F or
200°C, ALARM1 will be displayed.
If the RTD temperature goes below –58°F or
–50°C, ALARM2 will be displayed.
If the RTD temperature continues beyond
these limits, the display will eventually
indicate 1.-.-.-.
MAX/MIN Operation (if enabled)
The factory default setting has min/max disabled. To turn this
feature on, see the section titled User Configuration Mode. The
unit may be configure to use max, min, neither, or both.
To step the unit through the display modes,
press and hold the power button about 1
second until the display indicates MAX or
MIN and then release the button. The display
mode cycle repeats through the following
steps.
MAX Mode
The display indicates the stored maximum
reading and the lower display alternates
between indicating MAX and the temperature
units. The thermometer may be left in this
mode if desired.
MIN Mode
Press and hold the power button about 1
second The display indicates the stored
minimum reading and the lower display
alternates between indicating MIN and the
temperature units. The thermometer may be
left in this mode if desired.
Return to Normal Mode
To return from minimum or maximum
reading mode to the normal operating
mode, press and hold the power button for
about 1 second until the display indicates
the temperature units and then release the
button. The unit returns to the normal mode.
The stored maximum and minimum values
are not cleared and continue to be updated.
Reset MAX and MIN
To manually reset the stored maximum
and minimum readings, press and continue
to hold the power button until the display
indicates clr (about 3 seconds total) and then
release the button. The stored maximum and
minimum values are cleared. The unit returns
to the normal mode.
The Min/Max memory may be configured to be automatically
cleared when the unit shuts down, or may be configured to
retain the values when the unit is shut off. See the section titled
User Configuration Mode for these options.
Temperature Unit Selection
To change temperature units, press and hold
the
s
button until the temperature indication
is blanked and only the temperature units are
displayed.
Then use the
s
and
t
buttons to select the
desired temperature units. Standard units are
Fahrenheit, Celsius, and kelvin.
When the desired units are displayed, press
and release the power button to save the
selection and exit the change mode.
If no buttons are pressed for 15 seconds, the
unit will automatically save the selection and
exit the change mode.
Auto Shutoff Time Selection
To change the auto shutoff time, press and
hold the
t
button until the auto shutoff time
is displayed.
The lower display will indicate AST M if the
auto shutoff time displayed is in minutes, and
AST H if it is in hours.
An auto shutoff time of zero signifies that the
auto shutoff feature is disabled.
Use the
s
and
t
buttons to select 0, or 1,
2, 5, 10, 15, 20, or 30 minutes, or 1, 2, 4,
or 8 hours.
When the desired auto shutoff time is
displayed, press and release the power
button to save the selection and exit the
change mode.
If no buttons are pressed for 15 seconds,
the unit will automatically save the displayed
selection and exit the change mode.
PRTXB Series RTD Process Thermometers
2
User Configuration Mode
With the unit off, press and hold the
s
button.
Then press the power button.
Release all buttons when the display
indicates CFG.
Before the unit enters the configuration
mode, the display initially indicates _ _ _ _
with the first underscore blinking, and with
CFGPC on the lower display.
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 configuration 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 configuration procedures. Note:
If an incorrect pass code is entered, the unit
will return to the start of the pass code entry
sequence.
MAX/MIN Capture Configuration
The upper display will be blank.
Use the
s
and
t
buttons to select from the
following.
MX/MN Both highest and lowest values will
be captured
MX/-- Only highest value will be captured
--/MN Only lowest value will be captured
--/--
Capture feature is disabled
Press and release the power button to move
on to the next parameter.
Auto/Manual MAX/MIN Clearing
The upper display will indicate clr.
Use the
s
and
t
buttons to select from the
following.
AUTO Maximum and minimum values will
automatically be cleared whenever
the unit shuts off.
MAN Maximum and minimum values will
be retained and must be cleared
manually as desired.
Press and release the power button to save
the user configuration and restart the unit.
ALARM 1
ALARM 2
DEG F
deg f
75.0
t
s
t
s
*
X X X X X
88888
ALARM 2
ALARM 1
deg f
off
t
s
Press any button to
keep on
deg f
75.0
t
s
*
Press and hold
to turn off
deg f
75.0
t
s
*
Press and hold
about 1 sec.
deg f
i25.5
t
s
max
deg f
i25.5
t
s
min
*
Press until MIN
is displayed
deg f
t
s
*
Press and hold
about 1 sec.
mx/mn
c l r
t
s
*
Press until clr
is displayed
normal mode
or
AST M
5
t
s
*
Press & hold
ast m
i0
t
s
ast h
*
or
*
AST H
4
t
s
*
Save & exit
normal mode
or
deg f
t
s
*
Press &
hold
deg f
t
s
deg C
Kelvn
*
or
*
deg C
t
s
*
Save & exit
normal mode
cf6
t
s
Release buttons
t
s
*
2
*
1
cfgpc
____
t
s
cfgpc
3___
t
s
*
*
or
*
Increment
up or down
Move to
next #
cfgpc
35 i0
t
s
*
*
or
*
Increment
up or down
Move to
next #
cfgpc
35 i0
t
s
*
Press to enter con-
figuration mode
--/--
t
s
*
*
or
Select min
max modes
MX/mn
t
s
*
Press to save and
move to next
auto
c l r
t
s
*
*
or
Select auto or
manual clear
man
t
s
*
Press to save and
restart
c l r
