JUMO 902020/10 User manual

90000000T90Z001K000
V1.00/EN/00759990/2022-01-20
Installing and Using
JUMO Thermometers
Operating Manual

Contents
Contents
1 Basic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.1.1 Warning symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.1.2 Note symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2 Identifying the device version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
3 RTD temperature probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.2 Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.3 Sensor types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.4 Tolerance classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
3.5 Circuit types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.5.1 Two-wire circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.5.2 Three-wire circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3.5.3 Four-wire circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4 Thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.2 Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.3 Thermocouple types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.4 Type K thermocouples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
5 Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1 Lines of RTD temperature probes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
5.1.1 Correcting line resistances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
5.2 Lines of thermocouples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
5.3 Cable ends and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6 Protection tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7 Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
8.2 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
8.2.1 Installation location and alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.2.2 Screw-in thermometer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
8.2.3 Welded-stem thermometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Contents
8.2.4 Mineral-insulated thermocouples and RTD temperature probes . . . . . . . . . . . . . . . . . . . . .33
8.2.5 Surface probe for surface measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
8.2.6 Special installation situations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
8.2.7 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
8.3 Functional test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
8.4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
8.5 Dismounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
9 General product information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
9.1 Connection types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
11 Maintenance, cleaning, returns, and disposal . . . . . . . . . . . . . . . . . . . . . 44
11.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
11.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
11.3 Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
11.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
12 Further information and downloads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

5
1 Basic information
1 Basic informati on
1.1 Safety information
1.1.1 Warning symbols
DANGER!
This symbol indicates that personal injury from electrocution may occur if the appropriate precaution-
ary measures are not taken.
WARNING!
This symbol in connection with the signal word indicates that personal injury may occur if the respective
precautionary measures are not carried out.
CAUTION!
This symbol in connection with the signal word indicates that material damage or data loss will occur
if the respective precautionary measures are not taken.
1.1.2 Note symbols
Note symbols
NOTE!
This symbol refers to important information about the product, its handling, or additional benefits.
READ THE DOCUMENTATION!
This symbol, which is attached to the device, indicates that the associated documentation for the de-
vice must be observed. This is necessary to identify the nature of the potential hazard, and to take
measures to prevent it.
REFERENCE!
This symbol refers to additional information in other sections, chapters, or other manuals.
DISPOSAL!
At the end of its service life, this device and any batteries present do not belong in the trash! Dispose of
batteries properly and in an environmentally friendly manner.

1 Basic information
6
1.2 Intended use
NOTE!
To ensure operational safety, it is essential to use the thermometers properly and install them correctly.
Before carrying out installation work, it is therefore crucial to familiarize yourself with the thermometer,
its proper use, and the installation process. This document is a key reference work in this respect, along
with product-specific operating manuals in individual cases.
Observe the accident prevention regulations and safety provisions.
The manufacturer shall not be held liable for damage or loss resulting from:
• a failure to use the device in accordance with its proper use
• a failure to observe the specifications in this manual
• the use of unqualified personnel
• unauthorized conversions or modifications
• the use of external spare parts
DANGER!
Non-approved batteries constitute a safety risk!
Non-approved batteries may ignite potentially explosive atmospheres.
The Ex approval becomes null and void if non-approved batteries are used.
NOTICE!
Contamination may destroy the device!
Make sure that pollutants, moisture, and steam cannot enter the device.
When inserting or changing the battery, make sure that the device is not exposed to pollutants, mois-
ture, or steam.
NOTICE!
Damage to the device caused by incorrect battery polarity!
If the polarity is incorrect the device will be irreparably damaged.
Make sure that the battery poles are correctly connected.

7
2 Introduction
2 Introduction
2.1 General information
This operating manual supplements product-specific data sheets and applies generally for JUMO ther-
mometers used for contact-based temperature measurement.
NOTE!
Additional useful literature is referenced in chapter 12 "Further information and downloads", Page 45. If
you have any doubts, follow the specifications in the product-specific operating manuals or data sheets.
WARNING!
Risk of personal injury or damage to property!
Improperly performed work will result in personal injury or damage to property.
As a basic principle, installation and startup work for JUMO thermometers may only be performed
by qualified and authorized personnel who strictly follow this manual, the relevant standards and le-
gal regulations, the safety provisions, and the application-specific certificates.
2.2 Identifying the device version
In addition to clearly defined outer geometries, color coding for the connection lines, and resistance mea-
surements between the connection poles, thermometers are also identified by their nameplates and la-
beling.
Labeling example
NOTE!
The fabrication number on the nameplate is the most important specification when communicating with
JUMO.
Thermocouple or RTD temperature probe?
The following table serves as a general guide for comparing RTD temperature probes and thermocou-
ples. The particular features in individual cases are determined by the specific thermometer design.
(1) Company identifier
(2) Probe type
(3) Sensing element
(4) Part number, 8-digit
(5) Fabrication number, max. 19-digit
(6) Customer text
36039 Fulda, Germany
Typ 902020/10
ME Pt1000
TN 00305932
F-Nr.: 0188925801013500001
Customer-art-no.: 4712
(2)
(3)
(4)
(5)
(6)
(1)
Factor RTD temperature probe Thermocouple
Dimensions Comparatively large sensor surface Can be very small
Temperature range Up to approx. 600 °CaVery high temperatures possible
Response times Relatively long Short
Accuracy Very high High
Long-term stabilitybVery good Satisfactory
Self-heating Must be taken into account -
Vibration resistance Robust Very robust

2 Introduction
8
Cold junction Not required Required
Measuring current supplied Yes No
Measuring point Sensor Pair of thermal wires
Signal output Resistance Voltage
aHowever, pronounced drift effects from approx. 400 °C
bDepends on the operating temperatures
Factor RTD temperature probe Thermocouple

9
3 RTD temperature probe
3 RTD temperature probe
3.1 Design
An RTD temperature probe essentially comprises a temperature sensor, connection lines, and a protec-
tion tube. The temperature sensor is connected to a connection line/connection wires, insulated, and in-
serted into a protection tube (usually filled with a heat-conducting medium). The connection side can be
designed as a line end that has been kept free, or designed with a terminal head, with a connector, etc.
Alongside a variety of special versions, some RTD temperature probes are described fully by standards,
such as
• Straight thermometers with interchangeable sensor units – DIN 43764
• Threaded-stem thermometers with G 1/2 mounting thread – DIN 43765
• Threaded-stem thermometers with G 1 mounting thread – DIN 43766
• Welded-stem thermometers – DIN 43767
• Thermometers not fitted with protecting tubes – DIN 43769
• Fast response thermometers – DIN 43771
In some cases, individual components are also described by standards, such as
• Protective tubes – DIN 43772
• Flanges – DIN EN 1092
Variant with terminal head
(1) (2) (3) (4)
(1) Protection tube
• In contact with the process
• Protects the measuring insert against the medium (pressure, flow, etc.)
• On versions with immersion sleeves, the need to open the process can be avoided,
for example to replace the thermometer or measuring insert
(2) Process connection
• Interface with the process
• Thread, flange, etc.
(3) Extension tube
• Protects the components (such as the transmitter) against excess temperatures in the area of
the terminal head
• Spans the insulation, such as on pipes or furnaces;
the terminal head should always be outside the insulation
(4) Terminal head
• Contains and protects the connection components
• Display optional

3 RTD temperature probe
10
Example schematic of the construction of a measuring insert for RTD temperature probes:
(5)
(5) Measuring insert
• Contains the temperature sensor
• Replaceable or permanently installed
• Version with connection socket or transmitter is commonly found
(1) Connection points
(2) Sensor
(3) Protection tube
(4) Filled with heat-conducting medium
(5) Insulation

11
3 RTD temperature probe
Variant with connection line
A measuring insert can be found in this variant as well.
(1) (2) (3) (4) (5)
(1) Protection tube
• In contact with the process
• Protects the measuring insert against the medium (pressure, flow, etc.)
• On versions with immersion sleeves, the need to open the process can be avoided,
for example to replace the thermometer or measuring insert
(2) Process connection
• Interface with the process
• Thread, flange, etc.
(3) Transition between protection fitting and line
• Used to fasten (strain relief) and seal the line
• Available with bend protection as an optional extra (spring or tube)
(4) Connection line
• For signal transmission
(5) Contacting
• Version as ferrule, connector, etc.

3 RTD temperature probe
12
3.2 Operating principle
RTD temperature probes take advantage of the temperature-dependent change in the resistance of the
metals. For PTC resistors (PTC; positive temperature coefficient) such as platinum, the resistance in-
creases as the temperature rises.
For thermistors (NTC; negative temperature coefficient), however, the resistance decreases as the tem-
perature rises.
For platinum sensors, the characteristic line has been defined between -200 °C and +850 °C according
to DIN EN 60751. (However, the standard stipulates that limit deviations are only defined up to max.
660 °C.)
As a result, resistance measurements taken using the connection lines and the measuring surface of the
temperature sensor allows conclusions to be drawn about the temperature, provided that the exact re-
lationship between temperature and resistance has been established.
For PTCs, the nominal value is taken to be the resistance at 0 °C.
Example:
Resistance/ohm
Temperature/°C
Resistance at 0 °C Nominal value Sensor designation
100 Ω 100 Pt100 temperature sensor

13
3 RTD temperature probe
3.3 Sensor types
Sensors come in different versions. We essentially distinguish between thin-film sensors and sensors
with a solid wire winding.
The most common sensors are shown below.
Platinum-chip temperature sensors with connection wires, type PCA

3 RTD temperature probe
14
Platinum-ceramic temperature sensors, type PK
Platinum-chip temperature sensors on an epoxy PCB, type PCSE

15
3 RTD temperature probe
3.4 Tolerance classes
Change in tolerance depending on the measurement temperature (thin film)
Tolerance classes – temperature validity range (from DIN EN 60751)
t = measurement temperature in °C
± tolerance/K
Measurement temperature/°C
1/3 Class B Class A Class B Class 0.5
Tolerance class Sensor category Temperature range Tolerance
F 0.1 Thin film 0 to 150 °C ± (0.1 K + 0.0017 × |t|)
F 0.15 Thin film -30 to +300 °C ± (0.15 K + 0.002 × |t|)
F 0.3 Thin film -50 to +500 °C ± (0.3 K + 0.005 × |t|)
F 0.6 Thin film -50 to +600 °C ± (0.6 K + 0.01 × |t|)
W 0.1 Wire winding -50 to +250 °C ± (0.1 K + 0.0017 × |t|)
W 0.15 Wire winding -100 to +450 °C ± (0.15 K + 0.002 × |t|)
W 0.3 Wire winding -196 to +660 °C ± (0.3 K + 0.005 × |t|)
W 0.6 Wire winding -196 to +660 °C ± (0.6 K + 0.01 × |t|)

3 RTD temperature probe
16
3.5 Circuit types
3.5.1 Two-wire circuit
The two-wire circuit is the simplest circuit type for RTD temperature probes.
Three and four-wire circuits are also used to enable more accurate measurements.
With two-wire circuits, the line resistance influences the measurement result. This means that to obtain
accurate measurement results, the line resistance must be deducted or needs to be corrected at the
evaluation electronics; please see chapter 5.1.1 "Correcting line resistances", Page 22.
Minor deviations in the line resistance may occur due to fluctuations in temperature and the production
process.
3.5.2 Three-wire circuit
With three-wire circuits, it is possible to partially compensate the influence of the line resistances as a
result of temperature fluctuations. An additional measuring circuit is formed, which can be used as a ref-
erence. For this to work, the wire features must be identical.
3.5.3 Four-wire circuit
With a four-wire circuit, two measuring circuits are formed. The deviations (temperature-dependent sup-
ply line resistances, differing line resistances, etc.) can be fully compensated.

17
4 Thermocouples
4 Thermocouples
4.1 Design
A thermocouple essentially comprises a pair of thermal wires, which can be insulated and are inserted
into protection tubes. The thermal wires are connected to thermal or compensating cables. Their con-
nection side can be designed as a line end that has been kept free, or designed with a terminal head,
with a connector, etc.
Alongside a variety of special versions, some thermocouples are described fully by standards, such as
• Straight thermometers with interchangeable sensor units – DIN 43764
• Threaded-stem thermometers with G 1/2 mounting thread – DIN 43765
• Threaded-stem thermometers with G 1 mounting thread – DIN 43766
• Welded-stem thermometers – DIN 43767
• Thermometers not fitted with protecting tubes – DIN 43769
• Fast response thermometers – DIN 43771
• Mineral insulated metal-sheathed thermocouple cables and thermocouples –
DINEN61515
In some cases, individual components are also described by standards, such as
• Protective tubes – DIN 43772
• Flanges – DIN EN 1092
The basic construction is similar to that of RTD temperature probes.
chapter 3.1 "Design", Page 9
The main difference lies in the construction of the measuring insert.

4 Thermocouples
18
Variant with terminal head
(1) (2) (3) (4)
(1) Protection tube
• In contact with the process
• Protects the measuring insert against the medium (pressure, flow, etc.)
• On versions with immersion sleeves, the need to open the process can be avoided,
for example to replace the thermometer or measuring insert
(2) Process connection
• Interface with the process
• Thread, flange, etc.
(3) Extension tube
• Protects the components (such as the transmitter) against excess temperatures in the area of
the terminal head
• Spans the insulation, such as on pipes or furnaces;
the terminal head should always be outside the insulation
(4) Terminal head
• Contains and protects the connection components
• Display optional
(5)
(5) Measuring insert
• Contains the thermocouple
• Replaceable or permanently installed

19
4 Thermocouples
Thermocouples may be insulated or non-insulated/grounded.
The non-insulated construction produces faster response times. However, no electrical insulation and
no galvanic isolation between the thermocouple and the protection tube can be provided here. Take this
into account when connecting the thermocouple, so as to prevent potential entrainments, etc.
4.2 Operating principle
The Seebeck effect (= thermoelectric effect) is the key factor determining how thermocouples operate.
Its basic principle is as follows:
If there is a temperature difference along a wire, this will cause the charge carriers to move. The extent
to which the charge carriers move depends on the electrical features of the material.
If two wires made of different materials are connected and exposed to a temperature difference, a volt-
age that depends on the prevailing temperature difference will be present at both open ends.
If the temperature at the open end is known, you can infer the temperature at the connection point.
To carry out the temperature measurement, the temperature at the open end (right) must be known. If
this is not the case, thermal cables will need to be used to extend the thermocouple into a zone that has
a known, constant temperature. If a constant temperature cannot be ensured, the temperature of the
cold junction will need to be acquired.
Insulated construction Non-insulated construction

4 Thermocouples
20
4.3 Thermocouple types
Below you will find a table of thermocouples listing standardized voltage series and limit deviations.
In this context, the maximum temperature is the temperature up to which the limit deviations have been
defined. The voltage series has been standardized up to the temperature listed under "Defined up to."
Thermocouples according to DIN EN 60584/IEC 584
Thermocouples according to DIN 43710
The specified maximum temperatures may be reduced by the design of the overall probe (protection fit-
tings, thermocouple dimensions, insulation components, etc.). Also observe the environmental influenc-
es.
Thermocouples according to DIN EN 60584 have been assigned to up to three tolerance classes. These
tolerance classes apply to the thermometers in their as-delivered condition. Depending on the specific
environmental influences involved, use of the devices at higher temperatures may quickly alter the orig-
inal tolerance class supplied (aging).
The user must evaluate the extent of the drift (aging) caused by the operating conditions in their appli-
cation. They must decide on a case-by-base basis how often thermocouples need to be replaced or re-
calibration is required. The choice of thermocouple diameter is also a crucial factor in the aging.
Element Maximum
temperature
Defined up
to
Positive leg Negative leg
Fe-CuNi Type J 750 °C 1200 °C Black (magnetic) White
Cu-CuNi Type T 350 °C 400 °C Brown (copper col-
ored)
White
NiCr-Ni Type K 1200 °C 1370 °C Green White (magnetic)
NiCr-CuNi Type E 900 °C 1000 °C Violet White
NiCrSi-NiSi Type N 1200 °C 1300 °C Pink White
Pt10Rh-Pt Type S 1600 °C 1540 °C Orange White (softer)
Pt13Rh-Pt Type R 1600 °C 1760 °C Orange White (softer)
Pt30Rh-Pt6Rh Type B 1700 °C 1820 °C Gray White
Element Maximum
temperature
(continuous tem-
perature
in clean air)
Defined up
to
Positive leg Negative leg
Fe-CuNi Type L 700 °C 900 °C Red Blue
Cu-CuNi Type U 400 °C 600 °C Red Brown