Ametek RTC-158, RTC-250 Specifications

temperature

» High accuracy

Down to ±0.04°C using the external refer­ence sensor. 4-wire True-Ohm-Measurement
technology is used

» Excellent stability 0.01˚C

» Wide temperature range

RTC-158 from -22 to 155°C (-8 to 311°F)
RTC-250 from 28 to 250°C (82 to 482°F)

» Excellent temperature
homogeneity

Unique active dual-zone block ensures
good temperature homogeneity in
the calibration zone

Both for liquid bath

Reference Temperature Calibrator

RTC-158 & RTC-250

and dry-block use

» DLC

Patent

pending!

Dynamic Load Compensation

Perfect temperature uniformity in the

insert, even when calibrating large sen­sors or many sensors at a time.
B and C models only

» Temperature uniformity indicator

Shows the degree of temperature uniformity in
the insert when using the new DLC technology.
B and C models only

» New sensor basket

In combination with the stirrer the
newly developed sensor basket ensures
virtually zero axial and radial gradients in the
calibration zone

» Intelligent reference sensors

JOFRA reference sensors are supplied with
intelligent plugs, holding the calibration data
(coefficients) of the reference sensor. This is
a truly plug’n’play calibration system

» USB communication

All RTC calibrators communicate via an
easy-to-use USB port

» EURAMET

Best performing dry-block with regard to the
EURAMET/cg-13/v.01 guideline for testing of
dry-blocks

NEW!

Liquid Bath

AMETEK continues to develop new techniques to improve performance,
accuracy, convenience and functionality of the well-known JOFRA cali­bration products. By doing so, we maintain our position as the leading
worldwide manufacturer of temperature dry-block calibrators.

Advantages of the combined liquid bath/dry-block calibrator

Calibration of many sensors at a time due to more space for example
in connection with validation of many thermocouples, which saves
time

• Automatic calibration of as many as 24 sensors at a time

• For customers, who only want to use liquid baths

• For calibration of odd sizes and shapes of sensors including

sanitary sensors
WET = no need for inserts, that fit the sensors
DRY = more space for calibration of special sensors

• Industries who need to calibrate many sensors at a time or short

sensors can benefit from the big well

• JOFRACAL software and RTC B-models can handle on-line

calibration and documentation of multiple sensors calibrated
simultaneously

Dry-Block

ISO 9001 Manufacturer

Specification Sheet, SS-RTC-158/250

The RTC-158 and RTC-250

We are proud to introduce our new top model RTC
(Reference Temperature Calibrator) series, which is even
more sophisticated than any existing calibrators.

The RTC offers many new fantastic features, such as:

• Patent pending DLC, Dynamic Load Compensation

system, for perfect temperature uniformity in the insert

• Unique intelligent sensors for plug’n’play connection

• USB connector for communication

• Easy-to-read color VGA display with perfect overview of

the actual status

• Intuitive, fast and user-friendly navigation

• Lightweight and easy to carry around

• New functional carrying case design

• Multi-hole inserts covering all the most used sensor

sizes

• High profile design and the well-known long lasting

JOFRA quality

The new RTC calibrator comes in three different models –
A, B, and C.

• RTC-A reference temperature calibrator

• RTC-B reference temperature calibrator with input for

reference sensor, DLC sensor and sensors-under-test

• RTC-C reference temperature calibrator with input for

reference sensor and DLC sensor

Liquid bath versus dry-block kit

The basic advantages of the liquid bath configuration ver­sus the dry-block configuration are as follows:

• You do not need insertion tubes for all your different

types of sensors

• You can calibrate sensors, which do not fit into

insertion tubes

• You can calibrate glass thermometers and gas or liquid

filled sensors

• You are ready to calibrate right away no matter what

sensor you may have

Liquid bath / large diameter insert

The RTC-158/250 are fitted with a 160 mm (6.3 in) deep
well with a diameter of 63.5 mm (2.5 in) and can be used
both as dry-block calibrators and as liquid calibration
baths with a magnetic stirrer.

A liquid bath and a dry-block diameter of 63.5 mm (2.5 in),
which is twice the size of any other dry-block, are both
new features. With these options, it is now possible to
calibrate even more temperature sensors simultaneously
and to calibrate large as well as odd sizes and shapes of
sensors, which is not possible with the remaining product
range.

RTC-158/250 can be used without an external reference
sensor, but if an STS-200 reference sensor is connected
directly to a B or C version or the reference thermometer
DTI-1000, you will obtain better accuracies and thereby
use the full potential of the calibrators.

The basic advantages of the dry-block configuration
versus the liquid bath configuration are as follows:

• No hazardous hot liquids

• Easier to handle insertion tubes than liquids

• More convenient to carry than when filled with liquid

• No need for external exhaustion

• 100% repeatability in the sensor position in the block

All specifications given in the liquid bath configuration are
based on the silicone oil supplied and recommended by
JOFRA.

2 www.jofra.com

Reference Temperature Calibrator • RTC-158/250

NEW!

plug’n’play

Intelligent reference sensors

The JOFRA STS-200 intelligent reference sensor as well
as the new DLC sensor are both containing all individual
calibration data regarding the sensor.

Firstly, this means that the time-consuming coefficient
downloading sequence with risk of errors is no longer nec­essary. Secondly, the user can change the reference sensor
and be up and running immediately.

With the intelligent sensors, AMETEK has eliminated a
source of error and the system is now giving a fail-safe
plug’n’play calibration system.

Unique reference sensors

The new STS-200 reference
sensor and the DLC sen­sor have both been special­ly designed. They are both
angled 90˚ and customized to
fit the calibrator so they are
only slightly higher than the
top of the RTC calibrator.

The unique design allows cal­ibration of threaded sensors
and sensors with connection
heads without any problems.

Easy to carry

A calibrator is carried from one job to another. Therefore,
it is essential that the weight of the calibrator is as low as
possible.

These inserts have holes
for both the DLC and
two reference sensors
(4 mm and 1/4”). These
holes are marked for
correct use.

With this multi-hole insert
in the carrying case the
user is able to calibrate
all the most commonly
known sensor sizes.

New designed basket

The sensor basket is designed to prevent sen­sors from interfering with the stirrer. Numerous
tests have been carried out to find the opti­mum design of the sensor basket in regard
to create the largest possible tempe­rature homogeneous zone. This work
has resulted in a new sensor basket
performing virtually zero axial and radial
gradients in the calibration zone.

Intelligent recalibration information

In order to comply with ISO, SOP’s and FDA it is imperative
that the calibration equipment never exceeds the expiry of
the calibration certificate. RTC calibrators are constantly
checking calibration dates on the calibrator as well as for
the connected STS and DLC sensors. If the calibration
period has expired, a warning will appear in the display.
This feature prevents costly consequence evaluation.

Easy-to-read
color display and user-friendly navigation

The new 5.7” full color VGA display is very easy to read.
The main temperatures, like SET, READ, TRUE and SUT
(Sensor under test) are always displayed at all stages of the
programming or calibration procedure.

We have thoroughly included the weight issue in our design
and have developed new design techniques that have
made the RTC calibrator lightweight and easy to carry
around without compromising its quality, durability and
functionality.

The purpose of minimizing the weight of the RTC calibrator
is to protect especially frequent users from overload.

Improved temperature calibration

Time is money! This is why all new RTC calibrators have an
increased heating and cooling speed. Heating and cooling
speed has been increased by up to 25%. The implication is
savings in both production downtime and general calibra­tion costs.

Multi-hole inserts

With the purpose of covering all sensor sizes, special multi­hole inserts have been developed.

Multi-hole inserts come in metric and imperial sizes.
Metric covers all standard sizes from 3 to 12 mm.
Imperial covers all standard sizes from 1/8 to 1/2 in.

The navigation is menu-driven and very logical to use and
the display shows any important information needed for
the current function. The communication windows pop up
and are followed by discrete sound messages. The display
is very bright and the main information can easily be read
from a distance.

NEW!

The large display contains more detailed information at a
glance, such as: Stability status • Load compensation sta­tus • Real time clock • Serial number of reference sensor •
Sensor-under-test status

www.jofra.com 3RTC-158/250 • Reference Temperature Calibrator

NEW!

Integrated support rod

The new integrated support rod is part of the reduced
weight philosophy. It is lightweight and very easy to mount
on the RTC. Two fixing holes are integrated in the calibrator
where the support rods can be mounted. The support rod
is especially useful in bath calibration.

Special designed carrying case

AMETEK has designed an all-in-one carrying case.

We have now made it possible to
store both the STS reference sen­sors and the DLC sensor in the car­rying case with an optimum physical
protection. There is room for inserts,
insulation plugs and calibration oil
as well as compartments for the
new integrated support rod set,
wires, manuals, certificates, plugs,
insert tools, etc.

All rooms are specially designed to hold one of the above
mentioned items. This makes it very easy to keep track of
any accessories.

SET-Follows-TRUE (model B & C only)

Available on B and C models only, the “SET-Follows-TRUE”
makes the instrument tune in until the temperature reading
of the external reference “TRUE” meets the desired “SET”
temperature. This feature is important when it is critical that
the temperature of the calibration zone matches the desired
temperature when measured with accurate external refer­ence sensors.

Reading of sensor-under-test (model B only)

Model B of the RTC is equipped with a built-in accu­rate measuring circuit for sensor-under-test (input), which
enables measurement of virtually any type of temperature
sensors including: Resistance thermometers (RTD), ther­mocouples (TC), transmitters, milliamps (mA), voltage (V)
and thermostats.

The RTC-B calibrators can be programmed from the key­board for fully automatic sensor calibration. Once the unit is
programmed, the instrument is self-operating and performs
the configured calibration routine. All calibration data are
stored and can be read in the display.

For optimum protection of the calibrator and the accesso­ries, the compartments are designed to hold the accessories
fixed during transportation.

The carrying case comes with integrated wheels for easy
transportation.

MVI - Secure temperature stability

MVI stands for ’’Mains power Variance Immunity’’.
Unstable mains power is a major contributor to on-site
calibration inaccuracies. Traditional temperature calibra­tors often become unstable in production environments
where large electrical motors, heating elements, and other
devices are periodically cycled on or off. The cycling of sup­ply power can cause the temperature regulator to perform
inconsistently, leading to both inaccurate readings and
unstable temperatures.

Switch test (model B only)

Users may perform a thermoswitch test and find “Open”,
“Closed” and the hysteresis (deadband) automatically. The
instrument retains the last twenty test results.

Auto-stepping

Up to 20 different temperature steps may be programmed
including the hold time for each step. Upon completion of
an auto step routine, the user can easily read the results
for the sensor-under-test on the RTC display. Results from
twenty auto-step calibrations are stored.
The “Set temperature” feature allows the user to set the
exact desired temperature with a resolution of 0.001°.

Highest accuracy (model B & C only)

The RTC series calibrators may be supplied with a built-in
reference thermometer to be used with an external refer­ence sensor. This feature allows the instrument to perform
calibration on-site, while maintaining a high accuracy.

The user can decide whether to read the built-in reference
sensor or the more accurate angled reference sensor from
the large, easy-to-read LCD display of the calibrator. The
external sensor and the internal sensor readings are inde­pendent of one another.

4 www.jofra.com

Enhanced stability

A stability indicator shows when the RTC calibrator has
reached the desired temperature and is stable. The user
may change the stability criteria for the external reference
and the sensor-under-test quickly and simply. The stabil­ity criterion is the user’s security of a correct calibration.
A count-down timer is displayed next to the temperature
read-out.

Reference Temperature Calibrator • RTC-158/250

Instrument setups

The RTC series allows the user to store up to ten (10) com­plete instrument setups. You may store all sorts of informa­tion including temperature units, stability criteria, use of
external reference sensors, resolutions, sensors-under-test
(SUT), conversions to temperature, display contrasts, etc.
The setup may be recalled at any time.

Maximum and minimum temperature

From the setup menu, the user can select the maximum
and minimum temperature limit for the calibrator. This func­tion prevents damage to the sensor-under-test caused by
excessive temperatures and it helps reducing sensor drift
from exposures of too high temperatures. This feature can
be locked with an access code.

Silent operation

The RTC calibrator can be programmed to run in silent
operation. This function is an advantage if calibrating in a
laboratory or in an office. During silent operation, the cali­brator is not using its full speed potential.

Work Orders allow the RTC calibrator to:

•Operate as a stand-alone instrument using advanced

calibration routines without the assistance of a personal
computer on site. The work order functionality

•Prevent unauthorized changes to a calibration routine.

Personnel who are not authorized to alter a calibration
routine cannot do so

Once all calibrations are completed, the data may be up­loaded to the JOFRACAL for printing of certificates. The
data collected can of course be stored on the personal
computer for later recall or analysis.

JOFRACAL offers extended output formats of the cap­tured calibration data such as PDF file format and ASCII/
semicolon separated text format for further processing and
calculation of data in spreadsheets and word processors.

As found/As left (model B only)

When running a calibration initiated from a work order, the
user can select the calibration as an As Found or an As Left
calibration.

SYNC output

A synchronization output signals when the instrument is
stable and may be used with ancillary devices such as
video recorders, digital cameras or as an input to a data
logging device. The SYNC output may be useful for au­tomating and documenting calibration when calibrating
external reading devices.

JOFRACAL calibration software

JOFRACAL is a highly versatile calibration software sup­plied with the RTC calibrators. The software ensures easy
calibration of all kind of temperature sensors, such as
RTD´s, thermocouples, transmitters and thermoswithes.
Furthermore, it can be used for pressure calibration i.e.
pressure gauges and pressure switches.

Free

download

www.jofra.com

Calibration of indication devices

When calibrating an indicating device in the work order
mode, users may key in the results during or after the test.
Using the “Calibration info” function, the user may view the
complete calibration task, including the “Scenario” before
the calibration takes place.

Calibration of up to 24 sensors
with JOFRA ASM

Using the RTC series together with the ASM, Advanced
Signal Multi-scanner, offers a great time-saving automatic
solution to calibrate multiple temperature sensors at the
same time. The ASM series is an eight channel scanner
controlled by the JOFRACAL software on a PC. Up to 3
ASM units can be stacked to calibrate up to 24 sensors at
a time. It can handle signals from 2-, 3- and 4-wire RTD’s,
thermocouples, transmitters, temperature switches and
voltage.

JOFRACAL integrates with JOFRA calibration instruments.
As for temperature calibrators, it is the whole range of
temperature calibrators. Regarding pressure calibrators, it
integrates with DPC-500, HPC and IPI pressure calibrators.
JOFRACAL also has full integration with the series of signal
calibrators.

JOFRACAL can also be used for manual calibrations, as it can
be set up to accept manual entry of calibration data together
with other liquid baths, ice points or dry-block heat sources.

The collected calibration data can be stored on a PC for
later recall or analysis. The RTC calibrator can be pro­grammed to store the calibration procedures and may be
taken out to the process site without bringing a personal
computer. This feature is named Work Orders.

Hardware requirements

1.1.1 PCs, minimum hardware requirements:

•Intel® Pentium® lI 1.4 GHz processor

•128MBRAM(256MBrecommended)

• 512MB free disk space on hard disk (1GB recommended)

prior to installation

• Standard VGA (800x600, 256 colors). 1024x768 recom­mended

•USBport

•Oneor more free RS-232 serialandUSBports,if using de-

vices requiring RS-232 communication

1.1.2 PCs, minimum software requirements:

• MicrosoftWindows® ME, Microsoft Windows® XP, Window 7

•Systemfonts:MSSansSerifandArial

www.jofra.com 5RTC-158/250 • Reference Temperature Calibrator

Unique temperature performance

The RTC series of calibrators provides precision tempera­ture calibration of sensors, whatever the type or format.
This is accomplished through an innovative active dual­zone heating technology.

The RTC-series features our well-known active dual-zone
heating technology. Each heating zone is independently
controlled for precision temperature calibration. The homo­geneity in the lower part is close to that of a laboratory
liquid bath. The lower zone ensures optimum heat dissipa­tion throughout the entire calibration zone. The upper zone
compensates for heat loss from the sensor-under-test and
from the open top. This design also eliminates the need for
extra insulation of sensors-under-test and makes it possible
to calibrate liquid-filled and other mechanical sensors.

DLC - Dynamic Load Compensation

To bring our well documented active dual-zone tech-

Patent

pending!

nology to an even higher level, we have developed

the patent pending new DLC system.

Based on the new DLC functionality, the RTC is the best
performing dry-block calibrator on the market, when being
calibrated and tested according to the globally accepted
EURAMET/cg-13/v.01 guideline for calibration and testing
of dry-blocks.

The DLC system comprises a special differential temperature
sensor designed especially for the RTC. The sensor is placed
in the insert and connected to the calibrator. When the DLC
function is enabled, the calibrator will automatically equalize
the temperature homogeneity inside the insert on top of the
normal temperature control and stabilization.

DLC - User advantages

Calibrating with DLC sensor has the following advantages:

1. Calibration of several sensors simultaneously

2. Calibration of thick sensors

3. TSL (Thermo Sensitive Length) independency. It is no

longer necessary to know the TSL of the sensor

4. Compensation for sensor production tolerances like the

PT100 element being mounted in various positions in
the sensor

5. Trouble-free calibration of sensors with PT100 elements

up to a 60 mm length

6. Verification that the dual-zone is active and well-functioning

7. A perfectly working calibrator. The DLC value should be

very close to 0.00 when the calibrator is loaded with a
DLC sensor and an external reference sensor

8. Together with the stability indication, the DLC indicates

when the calibration values can be read

This newly developed unique feature makes it possible to
perform top calibration specifications without being affected
by the actual load e.g. many sensors or very big sensors.

A new DLC sensor, Dynamic Load Compensation sensor,
has been specially developed for this purpose.

The RTC calibrator features the active dual zone tempera­ture control which improves the homogeneity in the well by
adjusting the temperature in the top of the well to the same
temperature as in the bottom. The dual zone keeps this dif­ference at a minimum.

The new DLC sensor
improves the homogene­ity even more by controlling
the homogeneity not only in
the well, but also inside the
insert, where the sensors­under-test are placed during
calibration. The DLC sensor
measures the temperature
homogeneity in the insert
and provides feedback to
the active dual-zone system,
which now compensates the
temperature difference to a
minimum inside the insert.
In this way, the DLC func­tion makes the homogeneity
independent of the different
loads of the insert.

Axial temperature curves for an RTC calibrator with and
without the DLC functionality activated. DLC controlling is
automatically disabled when the stirrer is started.

DLC Sensor

USB connector for communication

Another new RTC feature is the USB connection that facili­tates easy communication with JOFRACAL. The USB con­nection also supports easy download of future firmware
upgrades.

The USB connection provides fast and easy access to all
laptops without the need of RS-232 to USB converters.

Future-proof through e.g. a flash capability for easy firm­ware upgrades as well as already integrated LAN commu­nication, SD-card slot and USB host connectors for future
use.

NEW!

6 www.jofra.com

Reference Temperature Calibrator • RTC-158/250

INSERTS AND LIQUID BATH KIT

Undrilled inserts for RTC-158/250

Inserts, undrilled

1

Insert Code

UN1 Undrilled insert

UN2

UN3

Insert

Undrilled insert
with DLC

Undrilled insert with DLC
and reference sensor 4
mm and 1/4 in

RTC-158

A/B/C

124899 127758

127829 127834

127831 127835

Note 1: Use the insert code when ordered as the
standard insert together with a new calibrator.

Metric (mm)
Multi-hole inserts for RTC-158/250

Spare part no. for multi-hole inserts - metric (mm)

Instruments

Insert code

M01

Note 1: Use the insert code when ordered as the
standard insert together with a new calibrator.

1

RTC-158 A/B/C RTC-250 A/B/C

124897 127759

RTC-250

A/B/C

1/4 in
Reference
sensor (UN3)

1/4 in
Reference
sensor

DLC

(UN2 & UN3)

8 mm

5 mm

6 mm

DLC

4 mm

11 mm

3/16 in

4 mm
Reference
sensor (UN3)

12 mm

3 mm

6 mm

4 mm
Reference
sensor

9 mm

1/2 in

Imperial (Inch)
Multi-hole inserts for RTC-158/250

Spare part no. for multi-hole inserts - imperial (inch)

Instruments

Insert code

M02

1

RTC-158 A/B/C RTC-250 A/B/C

124898 127760

Note 1: Use the insert code when ordered as the
standard insert together with a new calibrator.

All inserts are supplied with a matching insulation
plug.

Liquid Bath Kit - Option BAT

The liquid bath kit for RTC-158/250 contains a sensor
basket, 2 covering lids, a magnet, a magnetic remover,
a liquid drainage tube and 0.75 l silicone oil.

1/4 in
Reference
sensor

5/16 in

3/16 in

1/4 in

DLC

1/8 in

1/4 in

4 mm
Reference
sensor

3/8 in

7/16 in

www.jofra.com 7RTC-158/250 • Reference Temperature Calibrator

FUNCTIONAL SPECIFICATIONS

Temperature range

RTC-158

@ ambient temp. 0°C/32°F ........-37 to 155°C/-35 to 311°F

@ ambient temp. 23°C/73°F ........-22 to 155°C/-8 to 311°F

@ ambient temp. 40°C/104°F ....... -9 to 155°C/16 to 311°F

RTC-250

@ ambient temp. 0°C/32°F .............5 to 250°C/41 to 482°F

@ ambient temp. 23°C/73°F .........28 to 250°C/82 to 482°F

@ ambient temp. 40°C/104°F .....45 to 250°C/113 to 482°F

INPUT SPECIFICATIONS

All input specifications apply to the dry-block of the calibrator
running at the respective temperature (stable plus an additional
20 minute period).

All input specifications are valid for RTC-158 and RTC-250.

RTD reference input (B & C models only)

Type .................. 4-wire RTD with true ohm measurements

F.S. (Full Scale) ...................................................... 400 ohm

Accuracy (12 months) ......

±(0.0012% rdg. + 0.0005% F.S.)

1)

Accuracy (model B & C) with external STS ref. sensor

RTC-158 B & C ......................................... ±0.04°C/±0.07°F

RTC-250 B & C ......................................... ±0.07°C/±0.13°F

12-month period. Relative to reference standard. Specs by use of
the external STS-200 reference sensor. Excl. sensor drift.

Accuracy with internal reference sensor

RTC-158 A, B & C ..................................... ±0.18°C/±0.32°F

RTC-250 A, B & C ..................................... ±0.28°C/±0.50°F

Stability

RTC-158 .................................................. ±0.01°C/±0.018°F

RTC-250 .................................................. ±0.02°C/±0.036°F

Measured after the stability indicator has been on for 15 minutes.
Measuring time is 30 minutes.

Radial homogeneity (difference between holes)

RTC-158 @ -22°C/-8°F, Block .......................0.03°C/0.05°F

RTC-158 @ 155°C/311°F, Block ....................0.05°C/0.09°F

RTC-158 @ range, Bath ...............................0.015°C/0.03°F

RTC-250 @ range, Block ................................0.05°C/0.09°F

RTC-250 @ range, Bath ...............................0.015°C/0.03°F

Resolution (user-selectable)

All temperatures ......................1° or 0.1° or 0.01° or 0.001˚

Heating time

RTC-158 -22 to 23°C/-8 to 73°F ................... 9 minutes

23 to 100°C/73 to 212°F .............. 23 minutes

100 to 155°C/212 to 311°F .......... 28 minutes

RTC-250 28 to 100°C/82 to 212°F ................ 3 minutes

50 to 100°C/122 to 212°F .............. 2 minutes

100 to 250°C/212 to 482°F ............ 9 minutes

Cooling time

RTC-158 155 to 100°C/311 to 212°F ............ 9 minutes

100 to 23°C/212 to 73°F .............. 24 minutes

23 to 0°C/73 to 32°F .................... 15 minutes

0 to -15°C/32 to 5°F .................... 21 minutes

RTC-250 250 to 100°C/482 to 212°F .......... 27 minutes

100 to 50°C/212 to 122°F ............ 27 minutes

50 to 28°C/122 to 82°F ................ 28 minutes

Time to stability (approx.)

RTC-158 ............................................................. 15 minutes

RTC-250 ............................................................. 15 minutes

Immersion depth

RTC-158/250 incl. insulation plug ............... . 180 mm/7.1 in

RTC-158/250 bath version .......................... . 150 mm/5.9 in

RTD Type Temperature 12 months

°C °F °C °F

Pt100
reference

Note 1: True ohm measurement is an effective method to
eliminate errors from induced thermoelectrical voltage

-22 -8 ±0.008 ±0.015
0 32 ±0.008 ±0.015

28 82 ±0.009 ±0.016
155 311 ±0.011 ±0.020
250 482 ±0.012 ±0.022

DLC sensor input (B & C models only)

Type Temperature 12 months

DLC 155

°C °F °C °F

-22 -58 ±0.014 ±0.025
0 32 ±0.010 ±0.018

28 82 ±0.010 ±0.018
155 311 ±0.008 ±0.015
250 482 ±0.008 ±0.015

* at 0.00°C / 0.00°F DLC reading

RTD sensor under test input (B model only)

F.S. (range) ............................................................. 400 ohm

Accuracy (12 months).................. ±(0.002% Rdg.+0.002% F.S.)

F.S. (range) ........................................................... 4000 ohm

Accuracy (12 months) ........ ±(0.005% Rdg. + 0.005% F.S.)

2-wire ............................................................ add 50 mOhm

RTD Type Temperature 12 months

°C °F °C °F

Pt100
90(385)
IEC

Pt500
90(385)
IEC

Pt1000
90(385)
IEC

-22 -8 ±0.025 ±0.045
0 32 ±0.026 ±0.047

28 82 ±0.026 ±0.047
155 311 ±0.030 ±0.054
250 482 ±0.033 ±0.060

-22 -8 ±0.113 ±0.203
0 32 ±0.116 ±0.209

28 82 ±0.118 ±0.212
155 311 ±0.129 ±0.232
250 482 ±0.131 ±0.236

-22 -8 ±0.063 ±0.114
0 32 ±0.064 ±0.115

28 82 ±0.066 ±0.119
155 311 ±0.075 ±0.135
250 482 ±0.082 ±0.148

Input and curves for many different resistance sensors
such as:

0-400Ω

(P10(90)386/P50(90)385/P100(90)385/P50(90)391/
P100(90)391/P100(90)392/M50(90)428/M100(90)428/
H120(90)672/Pt-100 MILL)

0-4000Ω

(P200(90)385/P500(90)385/P1000(90)385/YSI-400)

8 www.jofra.com

Reference Temperature Calibrator • RTC-158/250

Thermocouple input

Range ..................................................................... ±78 mV

F.S. (Full Scale) ......................................................... 78 mV

Accuracy (12 months) ........ ±(0.005% Rdg. + 0.005% F.S.)

TC Type Temperature 12 months*

°C °F °C °F

E

J

.

K

T

R

S

N

U

* Excl. CJC accuracy ±0.3˚C / ±0.54˚F

-50 -58 ±0.09 ±0.17
0 32 ±0.06 ±0.11

155 311 ±0.06 ±0.11
320 608 ±0.07 ±0.13

-50 -58 ±0.10 ±0.18
0 32 ±0.08 ±0.14

155 311 ±0.09 ±0.16
320 608 ±0.09 ±0.16

-50 -58 ±0.14 ±0.24
0 32 ±0.10 ±0.19

155 311 ±0.11 ±0.20
320 608 ±0.11 ±0.20

-50 -58 ±0.15 ±0.26
0 32 ±0.10 ±0.18

155 311 ±0.08 ±0.15
320 608 ±0.08 ±0.15

-50 -58 ±1.30 ±2.35
0 32 ±0.78 ±1.40

155 311 ±0.47 ±0.84
320 608 ±0.40 ±0.72

-50 -58 ±0.98 ±1.76
0 32 ±0.78 ±1.40

155 311 ±0.49 ±0.89
320 608 ±0.45 ±0.81

-50 -58 ±0.20 ±0.35
0 32 ±0.15 ±0.27

155 311 ±0.13 ±0.23
320 608 ±0.13 ±0.24

-50 -58 ±0.13 ±0.24
0 32 ±0.10 ±0.18

155 311 ±0.08 ±0.14
320 608 ±0.08 ±0.15

Transmitter supply

Output voltage ................................................ 24VDC ±10%

Output current .......................................... Maximum 28 mA

Mains specifications

Voltage ...............................115V (90-127) / 230V (180-254)

Frequency, non US deliveries ...............50 Hz ±5, 60 Hz ±5

Frequency, US deliveries .......................................60 Hz ±5

Power consumption (max.), RTC-158 ........................ 400 W

Power consumption (max.), RTC-250 ...................... 1150 W

Communication interface

Serial data interface .............................USB 2.0 device port

Serial data interface ...................USB 2.0 host double port*

LAN ...................................... Ethernet MAC 10/100 Base-T*

SD ............................................................................ SD slot*

* for future expansion

Miscellaneous

Operating ambient temperature ........0 to 40°C/32 to 104°F

Storage temperature ....................... -20 to 50˚C/-4 to 122˚F

Humidity ......................................................... 0 to 90% RH

Protection class ..........................................................IP-10

PHYSICAL SPECIFICATIONS

Weight and instrument size (L x W x H)

RTC-158 .......................................................... 11 kg/24.3 lb

RTC-250 ........................................................ 9.9 kg/ 21.8 lb

RTC-158/250 .... 366 x 171 x 363 mm / 14.4 x 6.7 x 14.3 in

Shipping (without carrying case)

RTC-158 .......................................................... 17 kg/37.5 lb

RTC-250 .......................................................... 16 kg/35.3 lb

Size ......................580 x 250 x 500 mm/22.8 x 9.8 x 19.7 in

Shipping (including optional carrying case)

RTC-158 .......................................................... 28 kg/61.7 lb

RTC-250 .......................................................... 27 kg/59.6 lb

Size ....................550 x 430 x 660 mm/21.7 x 16.9 x 26.0 in

INSERTS

Transmitter input mA (B model only)

Range ................................................................. 0 to 24 mA

Accuracy (12 months) ..........±(0.005% Rdg. +0.010% F.S.)

Voltage input VDC (B model only)

Range: .............................................................. 0 to 12 VDC

Accuracy (12 months) ..........±(0.005% Rdg. +0.010% F.S.)

Switch input (B model only)

Switch dry contacts

Test voltage ............................................... Maximum 5 VDC

Test current ..............................................Maximum 2.5 mA

Insert dimensions

RTC-158/250 outer diameter ....................... 63.5 mm/2.5 in

RTC-158/250 length ...................................... 160 mm/6.3 in

Weight of non-drilled insert (approx.)

RTC-158/250 ................................................ 1200 g/42.3 oz

Alloy

RTC-158/250 .................................. Special aluminium alloy

Use of other inserts may reduce performance of the cali­brator. To get the best results out of the calibrator, the
insert dimensions, tolerance and material is critical. We
highly advise using JOFRA inserts, as they guarantee
trouble free operation.

www.jofra.com 9RTC-158/250 • Reference Temperature Calibrator

STANDARD DELIVERY

Model A, B and C:

• RTC dry-block calibrator (user specified)

• Mains power cable (user specified)

• Traceable certificate - temperature performance

• Tool for insertion tubes

• JOFRACAL

• AMETRIM

• USB cable

• Set of rubber cones for insulation plugs

• Manuals

Model B contains the following extra items:

• Test cables (2 x red, 2 x black)

• Traceable certificate - input performance for reference

sensor and DLC sensor

• Traceable certificate - input performance for sensor-

under-test inputs

Model C contains the following extra items:

• Traceable certificate - input performance for reference

sensor and DLC sensor

EXTRA PARTS

127277 Support rod set for sensors, 2 gribs, 2 fixtures
125066 Extra fixture for sensor grib
125067 Extra sensor grib
122771 Mini-Jack connector for stable relay output
120516 Thermocouple Male Plug - Type J - Black
120517 Thermocouple Male Plug - Type K - Yellow
120514 Thermocouple Male Plug - Type N - Orange
120515 Thermocouple Male Plug - Type T - Blue
120518 Thermocouple Male Plug - Type R / S - Green
120519 Thermocouple Male Plug - Type Cu-Cu - White
125033 Silicone oil, Type 200/10cSt, 0.75 L, RTC-158
124885 Silicone oil, Type 200/50cSt, 0.75 L, RTC-250
125022 Liquid Bath Kit, RTC-158
125035 Liquid Bath Kit, RTC-250
127782 Carrying case with Trolley

ACCESSORIES

Carrying Case - Option CT

With our new special designed
carrying case it is now possible to
store all your sensors in the case
with an optimum physical protec­tion. An improved integrated trolley
system for easy and safe transpor­tation.

Support rod set - Option SR

Support rod for sensors to be
mounted on all JOFRA RTC dry­block calibrators. Holds the sensor
under test in the right position, while
calibrating. Includes 2 sensor grips
and 2 fixtures for sensor gribs.

Model A

Model B

NEW!

Model C

FUNCTIONAL COMPARISON

Model A Model B Model C
Dual-zone heating/cooling block • • •
MVI - Mains Variance Immunity (or similar) • • •
Stability indicator • • •
Automatic step function • • •
USB communication • • •
Display resolution 0.001˚ • • •
Programmable max. temperature • • •
SYNC output (for external recording device) • • •
Calibration of short sensors in special insert • •
External precision reference sensor input • •
External precision DLC reference sensor input • •
“SET” follows “TRUE” • •
Load compensation functionality • •
Input for RTD, TC, V, mA •
4-20 mA transmitter input incl. 24 VDC supply •
All inputs scalable to temperature •
Automatic switch test (open, close and hysteresis) •
Download of calibration work orders from PC •
Upload of calibration results (as found & as left) •

10 www.jofra.com

Reference Temperature Calibrator • RTC-158/250

ORDERING INFORMATION

Order number Description

Base model number

RTC158 RTC-158 Series, -22 to 155˚C (-8 to 311˚F)

RTC250 RTC-250 Series, 28 to 250˚C (82 to 482˚F)

Model version

A Basic model, without input

B Full model, incl. DLC sensor input, Reference sensor input, Sensor-under-test input

C Middle model, incl. DLC sensor input, Reference sensor input

Power supply (US deliveries 60 Hz only)

115 115V AC

230 230VAC

Mains power cable

A European, 230V

B USA/Canada, 115V

C UK, 240V

D South Africa, 220V

E Italy, 220V

F Australia, 240V

G Denmark, 230V

H Switzerland, 220V

I Israel, 230V

Insert type and size

NON No insert selected (standard)

UNX 1 x Undrilled Insert (Please see Insert selection for code)

MXX 1 x Multi hole insert (Please see Insert selection for code)

BAT Liquid bath kit

Dynamic L oad Compensation (B & C models only, optional)

DLC DLC sensor

STS Reference sensor (B & C models only, optional)

R1 STS-102 Ref. sensor. Dia. 4mm. Length 30mm (STS102A030EH) For RTC-158

R6 STS-200 Ref. sensor. Dia. 4mm. Length 183mm (STS200A916) For RTC-158

R7 STS-200 Ref. sensor. Dia. 1/4”. Length 183mm (STS200B916) For RTC-158

R8 STS-200 Ref. sensor. Dia. 4mm. Length 183mm (STS200A925) For RTC-250

R9 STS-200 Ref. sensor. Dia. 1/4”. Length 183mm (STS200B925) For RTC-250

Calibration Certificate

F Traceable Callibration Certificate (standard)

H Accredited Calibration Certificate

EA Full EURAMET Calibration Certificate

FS Traceable System Calibration Cer tificate (B & C models only)

HS Accredited System Calibration Certificate (B & C models only)

EAS Full EURAMET System Calibration Certificate (B & C models only)

EASD Full EURAMET System Calibration Cer tificate with DLC (B & C models only)

Accessories

CT Solid Protective Carrying case with integrated trolley

SR Support rod set

TR Solid Protective Carrying case with integrated trolley & Support rod set

Sample order number

RTC158 B 230 A SM DLC R2 EA CT

JOFRA RTC-158 B with 230VAC, EU power cord, set of metric inser ts, DLC, STS-200 ref. sensor, full EA temp.
calibration certificate, and carr ying case with integrated trolley.

www.jofra.com 11RTC-158/250 • Reference Temperature Calibrator

A business unit of AMETEK Measurement & Calibration

leading brands for test and calibration instrumentation.

Portable dry-block calibrators, precision thermometers

-90°C(-130°F) to 1205°C(2200°F). Temperature sensors

Convenient electronic systems ranging from -25 mbar to
1000 bar - fully temperature-compensated for problem-

Process signal measurement and simulation for easy

Pneumatic floating-ball or hydraulic piston dead weight

testers with accuracies to 0.015% of reading. Pressure

Texture Analysers to perform rapid, general food testing

and detailed texture analysis on a diverse range of foods

Allows measurement and characterization of moisture-

have earned their reputation for quality, reliability and

accuracy and they represent the de facto standard for

AMETEK Test & Calibration Instruments

Technologies Division offering the following industry

JOFRA Calibration Instruments

Temperature Calibrators

and liquid baths. Temperature ranges from

for industrial and marine use.

Pressure Calibrators

free and accurate field use.

Signal Instruments

control loop calibration and measurement tasks.

M&G Pressure Testers & Pu mps

generators delivering up to 1,000 bar.

Lloyd Instruments

Materials testing machines and software from Lloyd

Instruments guarantees expert materials testing

solutions. The comprehensive program also covers

and cosmetics.

Davenport Polymer Test Equipment

sensitive PET polymers and polymer density.

Chatillon Force Measurement

The hand held force gauges and motorized testers

force measurement.

Newage Testing Instruments

Hardness testers, durometers, optical systems and

software for data acquisition and analysis.

UK

Lloyd Instruments Ltd

Tel [phone]
[e-mail]

France

AMETEK S.A.S.

Tel [phone]
[e-mail]

Germany

AMETEK GmbH

Tel [phone]
[e-mail]

Information in this document is subject to change without notice. ©2012, by AMETEK, Inc., www.ametek.com. All rights reserved.

Denmark

AMETEK Denmark

Tel [phone]
[e-mail]

USA

AMETEK Measurement & Calibration Technologies
Tel [phone]
chatillon.fl[e-mail]

India

AMETEK Instruments India Pvt Ltd.

Tel [phone]
[e-mail]

12 www.jofra.com

www.jofra.com

Singapore

AMETEK Singapore Pte Ltd

Tel [phone]
[e-mail]

China

AMETEK Inc. - Shanghai

Tel [phone]

AMETEK Inc. - Beijing

Tel [phone]

AMETEK Inc. - Guangzhou

Tel [phone]
[e-mail]

Pub code SS-RTC-158/250 Issue 1203