WIKA CTH7000 User manual

Operating instructions
Ръководство за работа
EN
BG
Hand-Held thermometer, model CTH7000
Ръчен термометър, модел CTH7000
Ръчен термометър, модели CTH7000

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WIKA operating instructions, model CTH7000
EN
BG
Operating instructions, model CTH7000 Page 3 - 52
Ръководство за работа, модел CTH7000 Страница 53 - 103
Можете да намерите информация на други езици на адрес:
www.wika.com.
© 04/2013 WIKA Alexander Wiegand SE & Co. KG
All rights reserved. / Всички права запазени.
WIKA®is a registered trademark in various countries.
WIKA® е регистрирана търговска марка в много страни.
Prior to starting any work, read the operating instructions!
Keep for later use!
Преди да започнете експлоатацията, прочетете ръководството за работа!
Запазете го за по-късна употреба!

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Contents
Contents
1. General information 5
2. Design and function 6
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Description . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . 7
3. Safety 8
3.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . 8
3.2 Intended use. . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Improper use . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Responsibility of the operator . . . . . . . . . . . . . . . . . 10
3.5 Personal qualification . . . . . . . . . . . . . . . . . . . . 10
3.6 Personal protective equipment. . . . . . . . . . . . . . . . . 11
3.7 Safety marks. . . . . . . . . . . . . . . . . . . . . . . 11
4. Design and function 12
4.1 Principles of measurement . . . . . . . . . . . . . . . . . .12
4.2 Front panel . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4.2.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.2.3 About the display screen . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.2.4 CTH7000 thermometer inputs . . . . . . . . . . . . . . . . . . . . . . .15
4.2.5 Battery pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.2.6 Removing and replace the battery pack . . . . . . . . . . . . . . . . . .17
4.2.7 Battery charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.2.8 Name of plate(s). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.2.9 USB communication interface connector . . . . . . . . . . . . . . . . .20
4.3 Instrument operating modes . . . . . . . . . . . . . . . . . 20
4.3.1 Measurement mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.3.2 Menue mode (key) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.3.2.1 Selecting the thermometer input channel and
different mode [A/B key]. . . . . . . . . . . . . . . . . . . . . .23
4.3.2.2 Selecting relative temperature measurement [0 key] . . . . . .23
4.3.2.3 Selecting run/hold mode [ II ]. . . . . . . . . . . . . . . . . . .24
4.3.2.4 Backlight key [☼]. . . . . . . . . . . . . . . . . . . . . . . . .24
4.3.3 Other menu options . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.3.3.1 Selecting units . . . . . . . . . . . . . . . . . . . . . . . . . . .25
4.3.3.2 Channel options menu (channel A or channel B) . . . . . . . .25
4.3.3.3 Data logging menu . . . . . . . . . . . . . . . . . . . . . . . .29
4.3.3.4 Statistics menu . . . . . . . . . . . . . . . . . . . . . . . . . .31
4.3.3.5 Settings menu . . . . . . . . . . . . . . . . . . . . . . . . . . .32
4.3.3.6 System menu . . . . . . . . . . . . . . . . . . . . . . . . . . .34
4.3.4 Setting up temperature measurement . . . . . . . . . . . . . . . . . . .36

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Contents
Declarations of conformity can be found online at www.wika.com.
4.3.4.1 Temperature measurement with smart probe(s) . . . . . . . .36
4.3.4.2 Instrument calibration . . . . . . . . . . . . . . . . . . . . . . .36
4.3.4.3 Firmware version . . . . . . . . . . . . . . . . . . . . . . . . .36
4.3.5 Smart probe review . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
4.4 Instrument range . . . . . . . . . . . . . . . . . . . . . 38
4.4.1 Instrument measurement working range . . . . . . . . . . . . . . . . .38
4.4.2 Measurement ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
4.5 Smart probes . . . . . . . . . . . . . . . . . . . . . . 39
4.5.1 About smart probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
4.5.2 How smart probes work. . . . . . . . . . . . . . . . . . . . . . . . . . .39
4.5.3 Smart probe data security . . . . . . . . . . . . . . . . . . . . . . . . .39
4.5.4 Smart probe calibration supervisor . . . . . . . . . . . . . . . . . . . .39
4.5.5 Smart probe working range monitor . . . . . . . . . . . . . . . . . . . .39
4.5.6 Smart probe error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
5. Transport, packaging and storage 40
5.1 Transport . . . . . . . . . . . . . . . . . . . . . . . .40
5.2 Packaging and storage . . . . . . . . . . . . . . . . . . . 40
6. Commissioning, operation 41
7. Faults 42
8. Maintenance, cleaning and servicing 42
8.1 Maintenance. . . . . . . . . . . . . . . . . . . . . . . 42
8.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . 42
8.3 Recalibration. . . . . . . . . . . . . . . . . . . . . . . 43
9. Dismounting, return and disposal 43
9.1 Dismounting . . . . . . . . . . . . . . . . . . . . . . .44
9.2 Return . . . . . . . . . . . . . . . . . . . . . . . . .44
9.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . 45
10. Specifications 46
10.1 Resistance thermometer measurement . . . . . . . . . . . . .46
10.2 Display . . . . . . . . . . . . . . . . . . . . . . . .47
10.3 Functions . . . . . . . . . . . . . . . . . . . . . . . 47
10.4 Supply . . . . . . . . . . . . . . . . . . . . . . . . 47
10.5 Environmental . . . . . . . . . . . . . . . . . . . . . 47
10.6 Dimensions and weight . . . . . . . . . . . . . . . . . . 48
10.7 CE conformity and certificates . . . . . . . . . . . . . . . . 48
11. Communications interface 49
11.1 Introdction . . . . . . . . . . . . . . . . . . . . . . . 49
11.2 USB Command syntax . . . . . . . . . . . . . . . . . . 49
11.2.1 Command terminators (CR) or (CR)(LF) . . . . . . . . . . . . . . . . .50
11.2.2 Command details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
12. Accessories 52

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1. General information
1. General information
■The hand-held thermometer model CTH7000 described in the operating instructions
have been designed and manufactured using state-of-the-art technology. All
components are subject to stringent quality and environmental criteria during
production. Our management systems are certified to ISO 9001 and ISO 14001.
■These operating instructions contain important information on handling the instrument.
Working safely requires that all safety instructions and work instructions are observed.
■Observe the relevant local accident prevention regulations and general safety
regulations for the instrument's range of use.
■The operating instructions are part of the product and must be kept in the immediate
vicinity of the instrument and readily accessible to skilled personnel at any time. Pass
the operating instructions onto the next operator or owner of the instrument.
■Skilled personnel must have carefully read and understood the operating instructions
prior to beginning any work.
■The general terms and conditions contained in the sales documentation shall apply.
■Subject to technical modifications.
■Factory calibrations / DKD/DAkkS calibrations are carried out in accordance with
international standards.
■Further information:
- Internet address: www.wika.de / www.wika.com
- Relevant data sheet: CT 55.50
- Application consultant: Tel.: [phone]
Fax: [phone]
[e-mail]
Abbreviations, definitions
Alpha, or αis the temperature coefficient, or temperature sensitivity, of the platinum wire used
in PRTs. In general, the greater the alpha value, the better the PRT thermometer
measurement reproducibility, stability and performance
PRT (Platinum Resistance Thermometer)
Pt100 PRT with nominally 100 Ω resistance at 0 °C
RTD Resistance Temperature Device
System accuracy refers to the overall, combined accuracy of the CTH7000 and
thermometer.

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2. Design and function
2. Design and function
2.1 Overview
12 connection ports for temperature probe
2Large LC display
3USB connection port for PC
4Keypad
2.2 Description
The CTH7000 is a precision instrument designed for laboratory, commercial and
industrial temperature measurement and calibration applications.
Features include:
■Two input channels
■A large graphic LC display for excellent viewing of temperature measurement values
and instrument settings
■USB communication interface as standard for automated monitoring and calibration
applications
■Calibration against traceable external standards
4
3
2
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2. Design and function
The CTH7000 will operate with all 4-wire Pt100 (100 Ω) Platinum Resistance
Thermometers (PRTs) and with virtually all thermistors.
Temperature measurement units are user-selectable and can display °C, °F, K and Ω.
Overall system accuracy will depend on the sensor quality and calibration. See chapter
10 “Specifications”.
2.3 Scope of delivery
■CTH7000 precision thermometer
■Battery charger
■Operator’s handbook on CD
■Calibration certificate
■USB lead
■Software U-Log
Cross-check scope of delivery with delivery note.
Please contact the Service Team immediately if any of these items are missing or
damaged.
Please retain the packaging. In case of return, servicing or calibration, use the original
packaging. Failure to do so may invalidate the warranty and/or incur additional costs
outside the warranty period. Please contact your agent, dealer or supplier when the
original packaging is unavailable.

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3. Safety
3. Safety
3.1 Explanation of symbols
WARNING!
... indicates a potentially dangerous situation that can result in serious injury
or death, if not avoided.
CAUTION!
... indicates a potentially dangerous situation that can result in light injuries or
damage to property or the environment, if not avoided.
DANGER!
... identifies hazards caused by electrical power. Should the safety
instructions not be observed, there is a risk of serious or fatal injury.
WARNING!
... indicates a potentially dangerous situation that can result in burns, caused
by hot surfaces or liquids, if not avoided.
Information
... points out useful tips, recommendations and information for efficient and
trouble-free operation.
3.2 Intended use
Application
The model CTH7000 hand-held thermometer is a high performance 2-channel
thermometer for Pt100 and thermistor probes. The hand-held thermometer CTH7000 is a
step up in measurement accuracy with a battery power.
The CTH7000 is designed for laboratory and industrial temperature measurement and
calibration applications intended to be used in a basic electromagnetic environment.
Functionality
The CTH7000 can handle all needs, with accuracies and resolutions normally
associated with a bench top thermometer. Two inputs give direct temperatures from
Pt100 or thermistor probes or can display the temperature difference between them.
Measurements can be logged directly to memory or, use the USB port to control and data
log with the PC.

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3. Safety
Due to the wide range of this instrument it makes individual instruments needless and
makes the calibration cost-effective.
Features included:
■Simple handling
■Large display with dual temperature display
■Min/Max value for monitoring of temperature limits
■Mean value function for statistical evaluation
■Selectable channel can be switched off to improve the clarity of the display data
■Recording and visualisation of temperature cycles with the help of the ULog software
■Data logger
This instrument is not permitted to be used in hazardous areas!
The instrument has been designed and built solely for the intended use described here,
and may only be used accordingly.
The technical specifications contained in these operating instructions must be observed.
Improper handling or operation of the instrument outside of its technical specifications
requires the instrument to be taken out of service immediately and inspected by an
authorised WIKA service engineer.
Handle electronic precision measuring instruments with the required care (protect from
humidity, impacts, strong magnetic fields, static electricity and extreme temperatures,
do not insert any objects into the instrument or its openings). Plugs and sockets must be
protected from contamination.
For indoor use only.
Don’t connect lines within a building which are longer than 30 m, or leave the building
(including lines of outdoor installations).
The manufacturer shall not be liable for claims of any type based on operation contrary to
the intended use.
3.3 Improper use
WARNING!
Injuries through improper use
Improper use of the instrument can lead to hazardous situations and injuries.
▶Refrain from unauthorised modifications to the instrument.
▶Do not use the instrument within hazardous areas.
▶Do not use the instrument with abrasive or viscous media.

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3. Safety
Any use beyond or different to the intended use is considered as improper use.
3.4 Responsibility of the operator
The model CTH7000 hand-held thermometer is a high performance 2-channel
thermometer for Pt100 and thermistor probes.
The instrument is used in the industrial sector. The operator is therefore responsible for
legal obligations regarding safety at work.
The safety instructions within these operating instructions, as well as the safety, accident
prevention and environmental protection regulations for the application area must be
maintained.
The operator is obliged to maintain the product label in a legible condition.
To ensure safe working on the instrument, the operating company must ensure
■that suitable first-aid equipment is available and aid is provided whenever required.
■that the operating personnel are regularly instructed in all topics regarding work safety,
first aid and environmental protection and know the operating instructions and in
particular, the safety instructions contained therein.
■that the instrument is suitable for the particular application in accordance with its
intended use.
■that personal protective equipment is available.
3.5 Personal qualification
WARNING!
Risk of injury should qualification be insufficient
Improper handling can result in considerable injury and damage to property.
▶The activities described in these operating instructions may only be
carried out by skilled personnel who have the qualifications described
below.
Skilled personnel
Skilled personnel, authorised by the operator, are understood to be personnel who,
based on their technical training, knowledge of measurement and control technology and
on their experience and knowledge of country-specific regulations, current standards and
directives, are capable of carrying out the work described and independently recognising
potential hazards.
Special operating conditions require further appropriate knowledge, e.g. of aggressive
media.

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3. Safety
3.6 Personal protective equipment
The personal protective equipment is designed to protect the skilled personnel from
hazards that could impair their safety or health during work. When carrying out the various
tasks on and with the instrument, the skilled personnel must wear personal protective
equipment.
Follow the instructions displayed in the work area regarding personal protective
equipment!
The requisite personal protective equipment must be provided by the operating company.
Wear safety goggles!
Protect eyes from flying particles and liquid splashes.
Wear protective gloves!
Protect hands from friction, abrasion, cuts or deep injuries and also from
contact with hot surfaces and aggressive media.
3.7 Safety marks
Symbols
Before mounting and commissioning the instrument, ensure you read the
operating instructions!
CE, Communauté Européenne
Instruments bearing this mark comply with the relevant European
directives.
Do not dispose of with household waste. Ensure a proper disposal in
accordance with national regulations.

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4. Design and function
4. Design and function
4.1 Principles of measurement
The CTH7000 measures the voltage (Vt) developed across the unknown sensor
resistance (Rt) and the voltage (Vs) across a stable internal reference resistance (Rs).
The voltages are proportional to the resistances so the thermometer resistance is derived
from.
This technique achieves immunity from slow moving time and temperature drifts in the
electronics, as it is not affected by voltage measurement gain variations or current source
fluctuations.
In the same way that AC resistance measurement eliminates thermal EMFs, switched
DC achieves a similar advantage. Switched DC works by reversing the current flow on
alternate measurement cycles and taking the average value, thereby cancelling any
thermal EMF offsets from the measurement.
For PRTs, the relationship between resistance and temperature varies slightly from one
PRT to another. Therefore, no matter how accurately the CTH7000 measures the PRT
resistance, if the relationship between resistance and temperature for a particular PRT
is not known, accurate temperature measurement is not possible. For thermistors, the
relationship depends totally on the thermistor type and specifications.
The CTH7000 uses PRT and thermistor calibration data to overcome this problem and
calculates the result from temperature conversion functions stored in either the sensors
‘SMART’ connector or the CTH7000’s internal non-volatile memory. This method enables
the CTH7000 to convert resistance to temperature, uniquely for each sensor used.
It is very important, therefore, that a sensor without a ‘SMART’ connector is used on a
properly configured input channel and that the probes’ coefficients are correctly entered
into the instrument.
System accuracy is a combination of the CTH7000 accuracy in measuring sensor
resistance and the calibration uncertainty placed on PRTs and thermistors by the
calibrating laboratory.

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4. Design and function
4.2 Front panel
4.2.1 Overview
12 connection ports for temperature probe
2Large LC display
3USB connection port for PC
4Keypad
4
3
2
1

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4. Design and function
4.2.2 Keypad
The Power [ ]key turns power on and off 1) to the CTH7000.
The CTH7000 uses a menu system. The Menu [] key is located at the top right of
keypad. Use the Menu key to access to the less frequently used CTH7000 functions.
The four Arrow [▲▼◀▶]keys are used to navigate through the menus 2); the Enter
[] and Clear []keys are used to act on the menu selections 3).
The Backlight [☼]key located at the top left of the keypad provides LCD illumination
when the ambient light-level is too low for normal viewing.
The A/B key is used to select one of the two channels or the difference (A – B).
The Zero [0] key is used to provide relative (offset) readings.
The Hold [ II ] key is used to freeze the current reading.
1) The CTH7000 may also be set to power-off after a preset period.
2) The Up (▲) and Down (▼) keys can be used to change the displayed units.
3) The Clear () key is also used to view CTH7000 statistics; press once to select the statistics page. Press any key to
return.
Key Function
Menu display
☼Backlight
▲Up arrow
▼Down arrow
◀Left arrow
▶Right arrow
Clear (view statistics)
Enter
A/B A/B channel select
0 Zero (offset) reading
II Hold reading
ON/OFF

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4. Design and function
4.2.3 About the display screen
The large graphic LC display screen is the direct link to the instrument, presenting the
measurement results and information or menus to set and control the instrument.
The LC display screen is designed for reflective-viewing under normal ambient lighting; a
backlight is provided for use when ambient conditions are darker.
4.2.4 CTH7000 thermometer inputs
There are two input channels; two 5 pin DIN input-sockets are located at the top of the
instrument. These are designed to take either PRT or thermistor probes. Channel A is
colour-coded red. Channel B is colour-coded blue.
1Channel A (red)
2Channel B (blue)
1
2

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4. Design and function
Either channel can accept either Smart or Passive probes; any combination of probes can
be use together. Smart probes (described in chapter 4.5 “Smart probes”) contain their
own calibration information and communicate this to the CTH7000 as soon as they are
used. Passive probes do not contain calibration information and the CTH7000 must be
set-up with the calibration information for each probe used (and each time the probe is
changed).
Probe connection information for both PRTs and thermistors is shown below (viewed
looking towards the sockets).
⇒Two wire PRTs/thermistors must have pins1 & 2 connected together and also pins 4
and 5 connected together.
4-Wire SMART probe (SMP) PRT/thermistor input
4-Wire Passive probe PRT/thermistor input
Shield
PRT or thermistor
Shield
PRT or thermistor

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4. Design and function
4.2.5 Battery pack
1Battery pack removed
2Battery charger input connector
3USB communication
The instrument operates from battery power. The battery pack is replaceable. A low
battery indication is shown on the LC display when the battery needs recharging; the
instrument also audibly indicates a low battery condition. The battery may be d when
attached to the instruments.
4.2.6 Removing and replace the battery pack
To remove the battery pack, press the latching tab and slide the battery pack backwards.
To replace the battery pack, place the pack in position before sliding home. Check that
the battery pack is securely in position before using the instrument.
1
3
2

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4. Design and function
4.2.7 Battery charger
Please observe the following warnings (repeated from the front of the manual).
WARNING!
Only use the battery charger supplied.
Use of any other charger will invalidate the warranty and may lead to the
danger of overheating and to permanent instrument damage.
WARNING!
Take care not to short the battery packs’ contacts with any metal object when
the pack is not connected to the instrument.
WARNING!
Take care not trap any part of your hand when closing the battery
compartment.
WARNING!
Never cover the battery pack or charger during use.
The batteries are located in a removable pack located on the base of the instrument.
The battery pack contains two NiMHi cells (in series) and a charger control circuit.The
battery pack must only be charged using the unit supplied.
The battery pack has a socket on its side that accepts the charger’s connector. A LED
(viewable through an aperture on the top-rear of the pack) indicates the charger status.
The battery charger is provided with various interchangeable mains connectors; select
the one that you require - see the charger PSU pack for details.
Information
Disconnect the charger when not charging the battery pack.
Charger indication LED

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4. Design and function
Charging the battery pack
The CTH7000 battery pack may be charged during instrument use, when the instrument
is off, or when the pack is detached from the CTH7000.
Information
Performance may degrade if the batteries are charged during use.
Please follow the instructions below to ensure that the battery pack is fully charged (LED
charge status is shown in the table below):
■Turn off power to the adapter before plugging it into the side of the battery pack
■Switch on the power adapter (DC 6 V), ensuring the LE display flashes orange
■Leave the battery pack to fully charge. An overnight charge of about 10 hours (for a flat
battery with the CTH7000 off 1)) will ensure that the pack is fully charged (the actual
time depends on the initial battery state 2)). Charge time will increase if the CTH7000 is
used during this period.
■Turn off and remove the power adapter after charging is complete
■The meaning of the various LE display indications is shown on below
Status LED LED indication LED indication
Slow orange flash (1 s) Trickle charge
Fast orange flash (0.2 s) Fast charge
Solid green Charged (trickle charge enabled)
Slow red flash (1 s) Low battery temperature (trickle charge
enabled)
Solid red PSU voltage too high 3)
Fast red flash (0.2 s) Hardware error 4)
1) Allow 5 minutes before use if the batteries are completely flat.
2) Charge times may increase at higher ambient temperatures.
3) Charge times may increase at higher ambient temperatures.
4) Refer to customer services.
4.2.8 Name of plate(s)
The instrument rating plate shows the instruments maximum power consumption and
instrument serial number.
The label on the battery charger shows its operating voltage, current, frequency and
pack’s serial number.

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4. Design and function
4.2.9 USB communication interface connector
The USB connector is fitted as standard. Communication requires the installation of the
USB driver on a PC. See the separate information supplied on the CD. A standard USB
cable is supplied with the CTH7000.
The instrument can be used with the ULOG program (supplied on the CD) or simply used
to transmit ASCII data, which may be recorded using a simple terminal program.
Communication via an USB cable connected to a PC may cause the
CTH7000 to be noisy. WIKA can accept no responsibility for any performance
degradation when connected to a PC.
4.3 Instrument operating modes
The instrument has two operating modes.
■Measurement mode which displays the measurement readings and status information.
■Menu mode which lets you select and alter the instrument operation and its settings.
4.3.1 Measurement mode
In measurement mode, the LC displays the current reading (temperature or resistance),
the unit symbol, the channel and type of sensor selected (and conversion method); the
time of day is also shown.
⇒The time will be replaced by ‘Logging’ or ‘Remote’ when these modes are selected.
This is the normal operating display for the CTH7000. The display will look similar to the
one shown below.
1Smart probe serial 5Time of day
2Low battery indication 6Probe conversion method
3Current reading with units displayed
below
7Channel (ChA) using a 4 wire sensor
(PRT4)
4Reading units
This display will always reflect the operation of the instrument, showing the current
reading and settings. Readings are updated at the normal conversion rate of one every
two seconds.
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