Omega Products PRTXAL-2 Installation Manual

PRTXAL Series RTD Process

WHITE

Temperature Alarms

M-4997/1110

PRTXAL Series RTD Temperature Alarms
2 SPDT Configurable Relays

3.5"

8

1.37"

8

PROBE

LENGTH

8





1/2" NPT x 1/2" NPT

Continuous

weld on

non-spring

loaded

models

.25" dia.

2.5"

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

12"
12"

.75"

Hex nipple

316 stainless

Spring-loaded models
approx. .25" longer to

compress element in

thermowell.

compression

MODEL

PRTXAL-2
PRTXAL-2-SL
PRTXAL-4
PRTXAL-4-SL
PRTXAL-6
PRTXAL-6-SL
PRTXAL-9
PRTXAL-9-SL
PRTXAL-12
PRTXAL-12-SL

*

Thermowell required for spring-loaded versions

ALARM 1 ALARM 2

XXXXX

8

8

SEL

TEST

Turn at

hex

fitting

only!

Stem

Length

L

PROBE

Spring-Loaded

Spring-Loaded

Spring-Loaded

Spring-Loaded

Spring-Loaded

NC 1

3.0"

C 1
NO 1

NC 2
C 2
NO 2

.50" max.

TYPE

Fixed

Fixed

Fixed

Fixed

Fixed

"

2.0

1.25"

Probe length is measured
from top of full threads to
tip of probe.

Length = thermowell
“A” or “element length”
dimension.

User’s Guide

*

*

*

*

*

Shop online at



.75"

2-conductor 22 AWG power cable

BLACK

RED

BLACK Normally Closed (NC)

RED Common (C)

GREEN Normally Closed (NC)

BROWN Common (C)

BLUE Normally Open (NO)

Alarm Contact Ratings

0.5A/115VAC, 1A/24VDC, non-inductive

8 to 24 VAC 50/60 Hz or

9 to 32 VDC

6-conductor 22 AWG relay cable

SPDT 1

Normally Open (NO)

SPDT 2

e-mail: [e-mail]

For latest product manuals:

omegamanual.info

omega.com

MADE IN

Range and Resolution

–58.0°F to 392.0°F or –50.0°C to 200.0°C
User selectable °F or °C

0.1 degree resolution over entire range

Accuracy

±0.1% of span plus maximum sensor error of
±0.3°C at 0°C, ±1.1°C at 150°C
11 point linearization

Sensor

100 Ω RTD element

0.00385 alpha coefficient
IEC-751 Class B: ±0.3°C at 0°C, ±1.1°C at 150°C
10 second time constant

Display

4 readings per second nominal display update rate
4 digit LCD,

Alarm Outputs

Dual form C (SPDT) relay contacts
Relay contacts rated 1A/24VDC, 0.5A/115VAC, non-inductive
Bi-color (red/green) LEDs on front panel
Alarm trip update rate approximately 4 times per second

1

/2" digit height, alphanumeric lower display for units

Setpoint Functionality

Two independent alarm set points
Setpoint 1 high or low alarm
Setpoint 2 high or low alarm
Setpoint 1 deadband adjustment
Setpoint 2 deadband adjustment
Normal or reverse acting relays

Test Function

Front panel TEST button toggles both SP1 and SP2 alarm status,
independent of temperature input to allow testing of system
operation. Access can be pass code protected.

Out of Range Indication

User configurable upscale or downscale burnout
ALARM1 on display above 392°F or 200°C
ALARM2 on display below –58°F or –50°C
Below approx. –103°F (–75°C) or above approx. 482°F (250°C), the
display will indicate 1.-.-.-.

Controls and Functions

TEST Test alarm function
SEL Select

 Up: increment up for setup, pass code, or calibration
 Down: increment down for setup, pass code, or calibration

Calibration

User settable pass code to enter calibration mode
Zero and span temperature calibration

Electrical Connections

3 foot long, 2-conductor 22AWG cable for power
3 foot long, 6-conductor 22AWG cable for relays

Power

8 to 24 VAC 50/60 Hz or 9 to 32 VDC

1.0 watt maximum power consumption

Weight

Thermometer: approx. 14 ounces
Shipping weight: approx. 1 pound

Housing

NEMA 4X ABS/polycarbonate, gasketed rear cover

Connection and Probe Material

1

/2" NPT male hex nipple, 316 stainless steel

316 stainless steel probe sheath

Environmental

Storage: –40 to 203°F (–40 to 95°C) at housing
Operating: –4 to 185°F (–20 to 85°C) at housing

2

PRTXAL Series RTD Process Temperature Alarms

Precautions

Read these instructions before installation. Configuration may be
easier before installation.

Avoid shock hazards! Turn power off before connecting or
disconnecting wiring. All wiring must be performed by a qualified
electrician or instrumentation technician. See diagrams on other
side for wiring examples. Consult factory for assistance.

Install or remove thermometer using a wrench on the hex fitting
only. Do not attempt to turn by forcing the housing.

Do not exceed maximum allowable housing temperature.
The spring-loaded design must be used with a thermowell. The non-

spring-loaded design 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.

Normal Operation

The factory default configuration is °F, downscale burnout, Setpoint
1 High Alarm, Setpoint 2 Low Alarm, 1.0 degree alarm deadband,
normal acting relays, no pass code required for configure/test
alarms mode.

To turn the unit on, apply power. If so equipped, the optional display
backlighting will be on. The display backlighting will not be apparent
under bright lighting conditions.

The display segments are tested for approximately 1 second. During
the startup sequence, the alarm relays are de-energized and the
alarm status LEDs are off.

After power-up the RTD temperature and units are displayed along
with the alarm relay states as indicated by the LEDs. The display
and alarm status are updated approximately 4 times per second,

Display and Keypad

Numeric

display

RTD over-

range

Select Test Up Down

ALARM 1

XXXXX

8

8

8

8

8

SEL

TEST



ALARM 2



Lower alpha-

numeric display

RTD under-

range



Alarm 1 status LED

Green = Normal

Red = Alarm

Red blinking LED = unacknowledged alarm

Press Test to acknowledge alarm

Out-of-Range Indications

RTD over-range condition >392.0°F or >200.0°C
RTD under-range condition <–58.0°F or <–50.0°C
If the RTD temperature is outside of the

extrapolated range, a burnout condition will
be assumed.

1. . . . if upscale burnout is selected

–1. . . . if downscale burnout is selected.

Alarm Indications

The relevant bi-color LED will be illuminated green for a normal
condition or red for an alarm condition.

The red LED will blink at a slow rate until the alarm is acknowledged
or the alarm condition clears.

To acknowledge an alarm condition, press and release the TEST
button.

Viewing Alarm Trip Points

The RTD temperature, the value of Trip
Point 1, and the value of Trip Point 2 may be
selected for display as follows.

When the RTD temperature is being
displayed, press and release the SEL
(select) button. The Trip Point 1 value will be
displayed with TRIP1 on the lower display.

When the Trip Point 1 value is being
displayed, press and release the SEL button.
The Trip Point 2 value will be displayed with
TRIP2 on the lower display.

When the Trip Point 2 value is being
displayed, press and release the SEL button.
The RTD temperature will be displayed.

Alarm 2 status LED

Green = Normal

Red = Alarm

ALARM 1

ALARM 2

DEG F

DEG F

200.0

TRIPI

SEL

TEST





I80.0

TRIP2

SEL

TEST





I88.0

DEG F

SEL

TEST











Alarm Test Mode

This mode allows testing of the alarms
regardless of the alarm trip points or the
temperature reading.

From the normal mode with temperature
being displayed, press and hold the TEST
button and then press the SEL button.

Release both buttons when the display
indicates - - - - .

- or ­If pass code protection is enabled, before

the unit enters the Alarm Test Mode, the
display initially indicates _ _ _ _ with the
left-most underscore blinking, and with
TSTPC on the lower display. Enter the user­defined pass code (3510 factory default) as
described in the Pass Code Entry section.

Note: During pass code entry the LEDs will
turn off and the unit will not respond to
changes in RTD temperature. The alarm
relays will maintain their prior states. The
unit will automatically revert to normal
operation if no buttons are operated for
approximately 15 seconds.

While in the Alarm Test Mode
with no buttons pressed,
the display will indicate the
temperature with DEG C or DEG
F slowly blinking on the lower
display.

While the TEST button is pressed
and held, both LED indicators
and alarm relays will toggle to
their opposite state. The display
will continue to indicate the
temperature.

To exit the Alarm Test Mode,
press and release the SEL
button. The display briefly
indicates - - - - and then returns
to normal operation.

Adjusting Set Points

Go to the User Configuration Mode to set up the alarm parameters
before setting up the alarm setpoints. Whenever the user
configuration mode is entered, even if no changes are made, all
alarm set points will be reset to the factory default maximum and
minimum values.

Alarm 1 factory default: HI alarm, 392.0°F trip point.
Alarm 2 factory default: LO alarm, –58.0°F trip point.

“Set Point” is defined as the temperature that will result in a change
of state only from a normal to an alarm condition.

“Trip Point” is defined as the temperature value that will result in
a change of state of alarm condition, and includes the effect of
deadband when returning from an alarm to
a normal condition.

The instructions illustrate how to change
Trip Point 1. The procedure is the same for
Trip Point 2.

From the normal mode press and release
the SEL button to display Trip Point 1. If
you want to change Trip Point 2, press SEL
again until TRIP2 is displayed.

While TRIP1 is displayed, press and hold the
TEST button and then press the SEL button.

NC 1
C 1
NO 1

NC 2
C 2
NO 2

NC 1
C 1
NO 1

NC 2
C 2
NO 2

200.0

deg f

SEL

TEST



12

press both



- - - -

SEL

TEST



release both





- or -

____

TSTPC

SEL

TEST



release both





i88.7

deg F

SEL

TEST



i88.7

deg f

SEL

TEST





- - - -

DEG F

SEL

TEST



exit



200.0

TRIPI
TRIP2

or

SEL

TEST





200.0

tripi

SEL

TEST



12

press both



















- - - -

Release both buttons when the display
indicates - - - - .

If pass code protection is enabled, before
the unit enters the Alarm Test Mode, the
display indicates _ _ _ _ with the left-most
underscore blinking, and with TSTPC on the
lower display.

SEL

TEST



release both





- or -

____

TSTPC

SEL

TEST



release both









Enter the user-defined pass code (3510
factory default) as described in the Pass
Code Entry section.

Note: During pass code entry the LEDs
will turn off and the unit will not respond
to changes in RTD temperature. The alarm
relays will maintain their prior states. The
unit will automatically revert to normal
operation if no buttons are operated for
approximately 15 seconds.

While in the Set Point 1 Adjust Mode, the
display will indicate Trip Point 1 with TRIP1
blinking at a slow rate on the lower display.

To adjust Set Point 1, press and hold the
TEST button and the display will indicate
SP1 on the lower display. If the alarm is not
tripped the display will change by an amount
equal to the deadband value.

While holding the TEST button operate the
 and  buttons to adjust Set Point 1 to the
desired value. The Set Point 1 value is stored
when the TEST button is released.

Note that the unit will not respond to
changes in temperature, LEDs are turned off,
and the alarm relays will maintain their prior
states while the TEST button is held.

To change Trip Point 2 press SEL until TRIP
2 is shown. The procedure is the same as
Trip Point 1.

To exit, press the SEL button until the display
indicates - - - -. The unit then returns to
normal operation.

Pass Code Entry

Pass codes are used to prevent unauthorized changes to settings.
Up to three different pass codes can be used to allow access to the
configuration, alarm settings and output test, or calibration.

During pass code entry the LEDs will turn off and the unit will not
respond to temperature changes. The alarm relays will maintain
their prior states. The unit will automatically revert to normal
operation if no buttons are pressed for 15 seconds.

Configuration Pass Code

From the normal operating mode press and
hold the TEST and the  buttons. Then
press the SEL button. Release all buttons
when the display indicates CFG.

The display initially indicates _ _ _ _ with
the first underscore blinking, and with
CFGPC on the lower display.

Enter the user-defined pass code as
described on the next page.

Calibration Pass Code

Press and hold the TEST and the  buttons.
Then press the SEL button. Release all
buttons when the display indicates CAL.

The display initially indicates _ _ _ _ with
the first underscore blinking, and CALPC on
the lower display.

Enter the user-defined pass code as
described on the next page.

Test and Set Point Adjust Pass Code

The optional for pass code protected alarm
testing or set point changes is set in CFG
mode. It is not used in the factory default
configuration.

Press and hold the TEST button. Then press
the SEL button. Release all buttons when the
display indicates - - - - .

If TSTPC pass code is enabled, the display
indicates _ _ _ _ with the first underscore
blinking, and TSTPC on the lower display.

Enter the user-defined pass code as
described on the next page.

35 i0

TSTPC

SEL

TEST





200.0

TRIPI

SEL

TEST



205.0

SP I

SEL

TEST



hold



250.0

Trip2

SEL

TEST





- - - -

Trip2

SEL

TEST



exit



cf6

tpv27

SEL

TEST



2

1





then

together

____

cfgpc

SEL

TEST



- or -

CAL

tpv27

SEL

TEST



12



togetherthen

____

calpc

SEL

TEST



- or -

- - - -

SEL

TEST



12



then

____

tstpc

SEL

TEST









or









1







1









