Omega Products PRTXB-2-SL Installation Manual

PRTXB Series

RTD Process Thermometers

M-4998/1110

3.5"

8



8

8

PROBE

LENGTH

2.5"

2.5"
4"
4"
6"
6"
9"
9"

12"
12"

ALARM 2



MODEL

PRTXB-2
PRTXB-2-SL
PRTXB-4
PRTXB-4-SL
PRTXB-6
PRTXB-6-SL
PRTXB-9
PRTXB-9-SL
PRTXB-12
PRTXB-12-SL

*

Thermowell required for spring-loaded versions

Low battery

indication

ALARM 1

XXXXX

8

8

PROBE

TYPE

Fixed

Spring-Loaded

Fixed

Spring-Loaded

Fixed

Spring-Loaded

Fixed

Spring-Loaded

Fixed

Spring-Loaded

2.0"

3.0"

User’s Guide

*

*

*

*

*

Shop online at

Turn at

hex

fitting

only!

Stem

Length

Measured from

top of full threads

to tip of probe.

Length L =
thermowell “A” or
“element length”

Range and Resolution

–58.0°F to 392.0°F, –50.0°C to 200.0°C or 220K to 475K

0.1 degree resolution
User selectable °F, °C, or K

Accuracy

Includes linearity, hysteresis, repeatability
±0.3°C at 0°C, ±1.1°C at 150°C
11-point linearization table

Display

4 readings per second nominal display update rate
4 digit LCD, 0.5" H, 5 character 0.25" H alphanumeric
BL models: red LED backlight

Sensor

IEC-751 Class B 100  Platinum RTD, 0.00385 alpha curve

1

/2" NPT male, 316 stainless steel

Spring-loaded probe versions fit standard thermowells

Auto Shutoff Time

Factory default 5 minutes. User settable to 1, 2, 5, 10, 15, 20,
30 minutes, 1, 2, 4, 8 hours, or manual on/off.
OFF warning before auto shutoff to allow reset of timer

1.37"

L

0.75"

Hex nipple

1/2" NPT x 1/2" NPT

316 stainless

Continuous weld

on non-spring
loaded models

Spring-loaded models

approx. 0.25" longer
to compress element

in thermowell.

0.50" max.

compression

0.25" dia.

1.25"

Batteries, Battery Life, Low Battery Indication

B: 2 AA alkaline, approx. 1000 hours
BL: 2 AA alkaline, approx. 150 to 750 hours depending on
backlight usage.
BL: Button press activates backlighting for 1 minute
Low battery symbol on display

Controls and Functions

Three front buttons for power on/off, min/max functions,
selection of °F, °C, or K, auto shutoff times, calibration and,
configuration options
User-defined pass codes for configuration and calibration to
prevent unauthorized changes

Maximum and Minimum Readings

User-configurable maximum and/or minimum temperature
indication. Factory default configuration MAX/MIN disabled.
Choice of MAX only, MIN only, MAX/MIN, or none
Option to retain or clear MAX/MIN temperatures at shutoff

Out-of-Range

ALARM1 under range indication on display
ALARM2 over range indication on display

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e-mail: [e-mail]

For latest product manuals:

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MADE IN

Calibration

User settable pass code required to enter calibration mode
Zero and span temperature calibration
Non-interactive zero, span, and linearity, ±10% of range

Weight

Product: 12 ounces (approximately)
Shipping: 1 pound (approximately)

Housing

ABS/polycarbonate NEMA 4X case, polycarbonate label, rubber
rear gasket

Connection, Material, Media Compatibility

1/2" NPT male fitting, 316L stainless steel
All wetted parts are 316L stainless steel
Thermowell required for spring-loaded versions

Storage Temperature

–40 to 203°F (–40 to 95°C)

Operating Range

–4 to 185°F (–20 to 85°C) at housing

2

PRTXB Series RTD Process Thermometers

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.

ALARM 1

XXXXX

8

8

8



ALARM 2

8

8





75.0

deg f





off

deg f





Press any button to

keep on

75.0

deg f





Press and hold



to turn off

ALARM 1

ALARM 2

DEG F

75.0

deg f





Press and hold



about 1 sec.

i25.5

deg f
max





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  button until the temperature indication
is blanked and only the temperature units are
displayed.

Then use the  and  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  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  and  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.

i25.5

deg f
min



Press until MIN



is displayed

deg f



Press and hold



about 1 sec.

normal mode

or

clr

mx/mn



Press until clr



is displayed

deg f



Press &



deg f
deg C

Kelvn



or

deg C



Save & exit



normal mode

AST M



Press & hold

i0

ast m
ast h



or

AST H



Save & exit



normal mode









hold





5



or



4



User Configuration Mode

With the unit off, press and hold the 
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  and  buttons to set the left­most 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  and  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  and  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  and  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  and  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  and  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.



1

2

cf6



Release buttons

____

cfgpc



3___

cfgpc



or





Increment

Move to

up or down

next #

35 i0

cfgpc



or





Increment

Move to

up or down

next #

35 i0

cfgpc





Press to enter con-

fi guration mode

--/--



or



Select min

max modes

MX/mn





Press to save and

move to next

clr

auto



or



Select auto or

manual clear

clr

man





Press to save and

restart



























