WIKA CTH6500 User manual

Operating Instructions
Betriebsanleitung
GB
D
Hand Held Thermometer, Model CTH6500
Hand Held Thermometer, Model CTH6500/CTH65I0
Handheld Thermometer, Typ CTH6500/CTH65I0

GB
D
WIKA Operating Instructions CTH65002
2079988.1 09/2011 GB/D
Hand Held Thermometer Page 3 - 32
Handheld-Thermometer Seite 33 - 61

GB
Hand Held Thermometer
CTH6500
1. General 4
1.1 General safety instructions 5
1.2 Safety instructions for Ex-operation 6
1.3 Operation and maintenance advice 7
1.3.1 Battery changing 7
1.3.2 Battery changing of the CTH65I0 7
1.3.3 Connecting/Changing temperature sensors 8
1.3.4 Maintenance 8
1.4 Operation 9
1.5 Switching On and OFF 9
2. Menu structure and settings 10
2.1 Menu structure 10
2.1.1 Changing the measuring units °C and °F respective
% rH, td or g/m³
11
2.1.2 Probe selection [Prob] 11
2.1.3 Dierence temperature activated/de-activated [Lin2]
(only 2-channel instruments)
13
2.1.4 Calibration function [CAL] 13
2.1.4.1 Calibration function of the combination probe [CAL]
(humidity/temperature)
16
2.1.5 Printer port [Pr€En] 17
2.1.6 Channel activation/[Chnl] (only 2-channel instru-
ments)
18
2.1.7 Enter Area for volume ow [ArEA] 18
2.1.8 Memory SETUP [Log] 19
2.2 Recalling data from the memory (HOLD, HAX, MIN,
AVE)
19
2.3 Measuring rate (FAST-mode) 20
2.4 AUTO-OFF function 20
2.5 Special-functions 21
2.5.1 Ohm/Micro volt/Volt/Hertz-display 21
2.5.2 Zero adjustment (Zero) 21
2.5.3 Deactivation of the 2nd channel (Toggle) 21
3. Interface Protocol RS-232 22
4. Connector Layout 23
5. Record of Probe calibration 26
6. Error Codes 27
7. Specications 28
8. Unit Diagramm 30
9. Accessories 31
10. Ex-Certicate 31
Contents
2079988.1 09/2011 GB/D
WIKA Operating Instructions CTH6500 3
Information
This symbol provides you with information,
notes and tips.
Warning!
This symbol warms you against actions
that can cause damage to persons or to the
instrument.

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Hand Held Thermometer
CTH6500
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WIKA Operating Instructions CTH65004
1. General
In the following chapters detailed information on the CTH6500
and CTH65I0 Hand Held Thermometer and its proper use can be
found.
Should you require further information, or should there be
problems which are not dealt within detail in the operating instruc-
tions, please contact the address listed on the last page.
Factory calibration of the instrument is according to relevant inter-
national standards.
The warranty period for the CTH6500 and CHT65I0 Hand Held
Thermometer is 24 months according to the general terms of
supply of ZVEI.
The guarantee is void if the appliance is put to improper use or
if the operating instructions are not observed or if an attempt is
made to open the appliance.
We also point out that the content of these operating instructions
neither forms part of an earlier or existing agreement, assurance
or legal relationship nor is meant to change these. All obliga-
tions of WIKA Alexander Wiegand SE & Co. KG result from the
respective sales contract and the general business terms of WIKA
Alexander Wiegand SE & Co. KG.
WIKA is a registered trade mark of WIKA Alexander Wiegand SE
& Co. KG. Names of companies or products mentioned in this
handbook are registered trade marks of the manufacturer.
We reserve the right to eect reasonable changes on the basis of
technical improvements.
Any reproduction of this manual or parts thereof by any means is
prohibited.
© 2005 Copyright WIKA Alexander Wiegand SE & Co. KG

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WIKA Operating Instructions CTH6500 5
1.1 General safety instructions
This device has been designed and tested in
accordance with the relevant safety regula-
tions for electronic devices. However, its
trouble-free operation and reliability cannot
be guaranteed unless the standard safety
measures and special safety advise given
in this manual is followed when using the
device.
■
Trouble-free operation and reliability of the device can only
be guaranteed so long as the device is not subjected to any
climatic conditions other than those stated under chapter
“7. Specication“.
■
The device and sensors must be handled with care (don‘t
throw, hit, etc.). Protect plugs and sockets from contamination.
■
Protect plugs and sockets from contamination.
■
For cleaning the instrument please do not use abrasive cleaner
but a dry or wet piece of cloth.
■
Do not use force to connect the probe or interface plugs in. The
interface plug is dierent form the probe plug.
■
If no sensor is connected to the instrument while switching on
“open” shows on the display. (Please refer to chapter “6. Error
codes”).
■
Please store the measuring insturment in a dry and clean place.
Operator safety may be at risk if
■
there is visible damage to the device
■
the device is not working as specied
■
the device has been stored under unsuitable conditions for an
extended period of time.
If there is any doubt, please return the device to the manufacturer
for repair or maintenance.
■
Customers must not attempt to alter or repair the device
themselves. Please return the device to the manufacturer for
any repair or maintenance.

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Hand Held Thermometer
CTH6500
Classe of tempera-
ture
Measuring point of tempera-
ture
T4 135 °C
T3 185 °C
T2 280 °C
T1 430 °C
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WIKA Operating Instructions CTH65006
1.2 Safety instructions for Ex-operation
Additional operating instruction:
(To be read in conjunction with the general safety
instructions in Section 1.1)
■
Battery operation:
Only use batteries which are approved from
the manufacturer! (See listing under chapter
“1.3.1 Battery changing).
■
The battery must not be changed within the
hazardous area.
■
Power supply operation
It is not allowed to use a power pack.
■
Temperature probes
It is only allowed to use Pt100-probes which are supplied from
the manufacturer for use in hazardous areas. The following
temperatures depending on the temperature class are admis-
sible at the measuring point (measuring probe):
■
Appears of defects
If there is any reason to suspect that the safety of the equip-
ment has been aected then it must be immediately withdrawn
from use and precautionary measures taken in order to prevent
any further use of the equipment in hazardous area until such
time that all necessary checks and repairs have been carried
out.
It is not allowed to open the instrument in hazardous areas.
■
erial Interface
Is is not allowed to use the RS-232 port.
■
Ex-operation
Within the hazardous area the instrument may only be operated
provided it is tted with the specied accompanying leather
case.
■
Temperature range
In case of operation in a potentially non-explosive atmosphere,
the temperature ranges indicated in the manufacturer‘s operat-
ing instructions must apply. The instrument may not be operat-
ed below 0 °C. Permissible ambient temperature: 0 °C ... 40 °C

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WIKA Operating Instructions CTH6500 7
Additional Ex-safety instructions:
Please adhere to the operating instruc-
tions and also the relevant local regulations
regarding the use of electrical equipment for
hazardous areas (e.g. VDE 0165).
1.3 Operation and maintenance advice
1.3.1 Battery changing
If the display shows the “BAT” segment, the battery needs chang-
ing. After showing the “BAT” segment the instrument has approx.
1 hour of battery life remaining.
A 9 Volt Dry-cell battery is used for the instrument power supply. To
change the battery, switch o the instrument and open the battery
cover on the rear of the instrument. Remove and disconnect the
battery from the instrument. Connect a new 9 V battery to the plug
and put the battery back into the instrument.
To protect the environment please don’t dispose
of batteries with household waste, but use
separate disposal.
If the device is not going to be used for some time, we advise that
the battery is removed.
1.3.2 Battery changing of the CTH65I0
The exchange of this maintenance element
may only be carried out outside of the
hazardous area. Take care and ensure that
when changing the battery, that only those
in the listed operating instructions are used.
The use of any other type of battery is strictly
forbidden in that it will invalidate the Ex-data
certication.
Professional Alkaline Battery Procell (Duracell)
Duracell Alkaline (Duracell)
Maximum Alkaline (Rayovac)
Everady Alkaline Energizer (Everady)
GP Super Alkaline Battery ISA (Gold Peak)
GP 15F8K Rechargeable (Gold Peak)
or Batteries which are approved according EN 50 020
chapter 10.9

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WIKA Operating Instructions CTH65008
1. In order to open the battery compartment rst remove the
leather case.
2. Now the battery cover on the back side of the case can be
opened.
3. Then you remove the supply element.
4. After exchanging the battery ret the leather case in order to
use the equipment in the hazardous area.
Attention: By closing the battery compartment
please be attend not to damage the battery cable.
1.3.3 Connecting/Changing temperature sensors
■
Only use the delivered temperature sensors! For a sensor
exchange, switch o the instrument. Plug in the sensor before
switching on the instrument, or otherwise it may occur that the
sensor is not properly identied by the instrument.
Digital indicator and temperature sensor are connected using
a discrete connecting cable. When changing the temperature
sensor, always connect and disconnect at the sensor end of the
cable.
To connect the sensor, rotate the plug till it locates in the guide
slot, allowing it to plug in.
Stecker nicht verkantet anstecken. If the plug is correctly located,
it will slide in smoothly. To disconnect the sensor hold it by the plug
to release the connector lock. Do not pull the cable to release it.
1.3.4 Maintenance
■
Digital indicator and sensors are manufactured using solid-
state technology, and contain no moving parts which could
wear. If the instrument housing has been opened, the warranty
becomes invalid.
■
Cleaning
For cleaning the instrument please do not use aggressive
cleaners but a dry or wet piece of cloth.
■
Storage
The CTH6500 Measuring Instrument must be stored in a
dry and dust free environment. The ambient temperature for
storage must be between -10 °C and +50 °C.

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Hand Held Thermometer
CTH6500
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WIKA Operating Instructions CTH6500 9
■
Disposal
WIKA provides for the correct disposal of used CTH6500/
CTH65I0 Digital Insturment. Simply return the Measuring Instru-
ment carriage paid to WIKA.
1.4 Operation
Before switching on the instrument, connect the probe/s to the
instrument and insert the battery (Please refer to chapter “1.3.1
Battery changing“). A number on the instrument’s housing marks
each port.
1.5 Switching ON and OFF
The instrument is switched On or O by pressing the ON/OFF
key. After switching on the instrument indicates a full segment
test for 1.5 sec., afterwards the instrument shows the calibration-
code and the adjusted measurement category for channel 1.
(Only 2-channel instruments: After a further 1.5 sec. the instru-
ment shows the calibration-code and the adjusted measure-
ment category for channel 2.) in the instrument then reverts to
measurement mode, indicating the actual measurement value (for
example: temperature). All instruments display the measurement
value of channel 1 in the top display line (large digits). Directly
below you will see the trend bargraph. For 2-channel instruments
the meas ured value of Channel 2 is displayed on the bottom line
(small digits).
Fig 1: Example of display after switching on.
channel 1
Line 1: [oFF P = calibration code of channel 1
according to standard linearization (DIN), probe
selection of channel 1 = Pt100.
channel 2
Line 2: [oFF P = calibration code of channel 2
according to standard linearization (DIN), probe
selection of channel 2 = Pt100.
On all instruments you can select the measure-
ment category (chapter “2.1.2 Probe selection
[Prob]”) according to the model version. Instru-
ments that are delivered with only one probe have
the correct measurement category preset. For all
other cases please check chapter “2.1.2 Probe
selection [Prob]” for the correct set-up.
1
2

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Hand Held Thermometer
CTH6500
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6
°C P T1-T2 OFF OFF OFF c OFF
°F J oP1 ON ON m ON
m/s K oP2
%rh L
g/m³ N
°C td R
°F td S
Pa T
hPa RH
m³/s D
Pr
H
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WIKA Operating Instructions CTH650010
2. Menu structure and settings
Settings of measurand, calibration data,
channel selection, etc. have to be done
according to the menu structure. You access
the main menu by pressing [ENTER/MENUE].
You can then select [▲▼] your required menu
item via the up and down keys. Press [ESC] to
return to the measuring mode.
2.1 Menu structure
up and down key
key [ESC]
key [ENTER/MENUE]
2
31
1
1
3
2

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Hand Held Thermometer
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WIKA Operating Instructions CTH6500 11
2.1.1 Measuring unit switching °C and °F respective % rH,
td or g/m³
Unit = Measuring unit
Measuring unit temperature (°C = Celsius, °F = Fahrenheit)
Measuring unit humidity
(% rH = relative humidity, td = dew point,
g/m³ = absolute humidity)
To change the measuring unit press [ENTER/ MENUE]. Use the
up and down keys [▲▼] to select Unit. Press again [ENTER/
MENUE]. On the left corner of the display appears a smal 1, which
indicates the selected channel. For changing the channel use the
up and down keys [▲▼]. Press [ENTER/MENUE] to conrm. On
the right corner of the display appears °C or °F, %rH, td or gm³
(depending on the selected probe). Use the up and down keys
[▲▼] again to adjust the requested measuring unit and press
[ENTER/ MENUE] to conrm. Press [ESC] to return to the measur-
ing mode.
2.1.2 Probe selection [Prob]
Press [ENTER/MENUE] to change a probe. Use the up and down
keys [▲▼] to select Prob. Press [ENTER/MENUE] to conrm.
On the left corner of the display appears a smal 1, which indicates
the selected channel. For changing the channel use the up and
down keys [▲▼]. Press again [ENTER/MENUE] to conrm. On the
right corner of the display appears the active probe. Use the up
and down keys [▲▼] to change the the probe (see table on next
page).
MENUE
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6
MENUE
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6

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Hand Held Thermometer
CTH6500
Measurement Probe selection (Prob) LCD-
Display
Temperature Pt100 (RTD)
Temperature Fe-CuNi Type J
Temperature NiCr-Ni Type K
Temperature Fe-CuNi Type L
Temperature NiCrSi-NiSi Type N
Temperature Pt13Rh-Pt Type R
Temperature Pt10Rh-Pt Type S
Temperature Cu-CuNi Type T
Humidity % rH
Flow m/s
Pressure Pa
Thermal ow probe m/s
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WIKA Operating Instructions CTH650012
Press [ENTER/MENUE] to conrm the reqused probe. Press
[ESC] to be back in the meauring mode.
Please check the probe selection to be sure that
the correct probe is entered. If a measurement
value is changed with the ENTER-key at the
menu Prob, the standard calibration will be used
automatically.
Indication for combination probes
(temperature and humidity):
Please adjust relatively humidity as measurement
value for the channel with the combination probe
is plugged. If you want that the measured temper-
ature of the plugged combination probe is shown
as well, you have to deactivate the channel
on which no probe is plugged on (see chapter
“2.1.6 Channel activation [Chnl] (only 2-channel
instruments)).

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WIKA Operating Instructions CTH6500 13
2.1.3 Dierence temperature activated/de-activated [Lin2]
(only 2-channel instruments)
To display the temperature dierential press [ENTER/MENUE].
Use the up and down keys [▲▼] to select Lin2. Press [ENTER/
MENUE] again. On the right corner of the display appears a
T1-T2. Use the up and down keys [▲▼] to adjust the requested
selection. Press [ENTER/MENUE] to conrm. Press [ESC] to
return to the measuring mode.
Both channel have to be activated for showing the
dierence temperature.
2.1.4 Calibration function [CAL]
Despite high quality manufacturing techniques, each probe is
slightly dierent from specied standards. To eliminate inaccura-
cies caused by exchanging or ageing of probes, the instrument
oer easy calibration functions which guarantee that the system
accuracy is always as good as if the insturment was specically
calibrated to the indivialual probes in our laboratory.
The instruments oer three calibration options:
1) [OFF]: Standard characteristic curve (e.g. Pt100-resistance
according DIN IEC 60 751.
2) [OP1]: Calibration by code (2 x four digit code) is equivalent to
a 2-point calibration. The code is marked clearly by a label on
each standard probe.
3) [OP2]: Calibration by physical standard references (1-point,
2-point or 3-point calibration)
CAL = calibration
Press [ENTER/MENUE] to calibrate the instrument with a sensor.
Use the up and down keys [▲▼] to select CAL. Press [ENTER/
MENUE] again. On the left corner of the display appears s small 1,
which indicates the selected channel. To change the channel use
the up and down keys [▲▼]. Press [ENTER/MENUE] to conrm.
MENUE
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6

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Hand Held Thermometer
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WIKA Operating Instructions CTH650014
Use the up and down keys [▲▼] to select the requested calibration
option. Press [ENTER/ MENUE] to conrm.
Standard linearization according DIN IEC 60 751 [oFF
Use the up and down keys [▲▼] to select [oFF.
Press [ENTER/MENUE] to conrm. Press [ESC] to return to the
measuring mode.
Calibration by code/oP1
Use the up and down keys [▲▼] to select oP1.
Press [ENTER/MENUE] to conrm.
On the bottom of the display appears a very
small 1 after this number a four-digit number
(Hex-Code/0 ... F) is displayed. For changing
the number use the up key [▲]. For stepping
to the next number use the down key [▼]. If
the requestec number is complete the press
[ENTER/MENUE] to conrm.
Now on the bottom of the display appears a
very small 2, after this number a second four-
digit number is displayed. For changing the
number please follow the manual as before.
Pusch [ESC] to return the measuring mode.
After conrming oP1 by pressing
[ENTER/MENUE] the function oP1 (calibration by
code) is activated, even though you exit the menu
by pressing [ESC].
Display-indication with active calibration code
(OP1):
The CAL-segment and the small 1 on the left
indicates to the user that oP1 is activated.
CAL
oFF oP1 oP2
MENUE
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6

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WIKA Operating Instructions CTH6500 15
Calibration by physical standard references/oP2
Use the up and down keys [▲▼] to select oP2. Press [ENTER/
MENUE] to conrm.
On the bottom of the display appears 1 P. For changing between a
1-Point [1 P], 2-Point [2 P] or 3-Point [3 P] - calibration use the up
and down keys [▲▼].
Example of a 1-Point calibration:
Press [ENTER/MENUE] to conrm. On the
display appears Go. After the displayed
measuring value is stabile press [ENTER/
MENUE]. App. 2 seconds later in the rst
display line appears P1 (measuring value 1); in
the second display line appears dP. (standing
for decimal point).
Use the up and down keys [▲▼] to select the
number of digits after the decimal point:
dP. = two decimal points
dP. = one decimal points (decimal point is
moved one digit to the right)
Press [ENTER/MENUE] to conrm. On the
second line of the display appears Si . Use
the up and down keys [▲▼] to select the
requested sign.
Si = reference standard shows a negative
measuring value (below 0.00 °C)
Si = reference standard shows a positive
measuring value (below 0.00 °C)
Press [ENTER/MENUE] to conrm. On the
second line of the display appears Fd 0.
Use the up and down keys [▲▼] to select the
requested sign.
Fd 0 = below 1000 °C
Fd 1 = above 1000 °C
Press [ENTER/MENUE] to conrm. On the the
display appears 00.00. For changing the value
use the up key [▲]. For stepping to the next
number use the down key [▼]. If the request-
ed value is complete then press [ENTER/
MENUE] to conrm.
Press [ESC] to return to the measuring mode.
oP2
1 P 2 P 3 P

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WIKA Operating Instructions CTH650016
A break of the physical calibration cannot be
done by pressing the [ESC]-button. Switching o
the instrument can only do a break of the physical
calibration.
Display-indication with active calibration code
(OP2):
The CAL-segment and the small 2 on the left
indicates to the user that oP2 is activated.
2.1.4.1 Calibration function of the combination probe
(humidity/temperature) [CAL]
All of WIKA’s humidity probes are combination probes. That
means that beside the humidity sensor these probes also contain
a temperature sensor. Both measurement values are plugged
in the same channel over one porbe. Before calibrating of both
measurement values (humidity and temperature) the calibrated
measurement value must be adusted at the menu see Chapter
“2.1.2 Probe selection [Prob]”.
The instruments oer three calibration options:
1) [OFF]: Standard characteristic curve (no probe-specic correc-
tion will be carried out).
2) [OP1]: Calibration by code (2 x four digit code) is equivalent to
a 2-point calibration. The code is marked clearly by a label on
each standard probe/rH = humidity & P °C = temperature.
3) [OP2]: Calibration by physical standard references (1-point,
2-point or 3-point calibration) is only possible for the rH humid-
ity value.
CAL = calibration
Press [ENTER/MENUE] to calibrate the instrument with a sensor.
Use the up and down keys [▲▼] to select CAL. Press [ENTER/
MENUE] again. On the left corner o the displayappears a small 1,
which indicates the selected channel. For changing the channel
use the up and down keys [▲▼]. Press [ENTER/MENUE] to
conrm.
With the up and down keys [▲▼] you can now choose between rH
for calibration of humidity and P °C for calibration of temperature.
MENUE
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6

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WIKA Operating Instructions CTH6500 17
Use the up and down keys [▲▼] to select the desired calibration
option. Press [ENTER/ MENUE] to conrm.
Standard linearization/[oFF]
Use the up and down keys [▲▼] to select [oFF. Press [ENTER/
MENUE] to conrm.
Calibration by code/oP1
Use the up and down keys [▲▼] to select oP1.
Press [ENTER/MENUE] to conrm the desired
setting. On the bottom of the display a small
1 will appear, after this number a four-digit
number (Hex-Code /0 ... F) is displayed. For
changing the number use the up key [▲]. For
stepping to the next number use the key down
[▼]. If the requested number is complete then
press [ENTER/MENUE] to conrm. Now on the
bottom of the display appears a small 2 and
after this number a second four-digit number
is displayed. For changing the number please
follow the manual as before. Press [ESC] to
return to the measuring mode.
2.1.5 Printer port [PrEn]
PrEn = Printer enable
Press [ENTER/MENUE] to activate or deactivate the printer port.
Use the up and down keys [▲▼] to select PrEn. Press [ENTER/
MENUE] again. Use the up and down keys [▲▼] to activate on
or deactivate o the requested adjustment and press [ENTER/
MENUE] to conrm. Press [ESC] to return to the measuring mode.
CAL
oFF oP1 oP2
CAL
rH P°C
MENUE
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6

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WIKA Operating Instructions CTH650018
2.1.6 Channel activation (only 2-channel instruments) [Chnl]
Chnl = channel
To activate or deactivate a measuring channel press [ENTER/
MENUE]. Use the up and down keys [▲▼] to select Chnl. Press
[ENTER/ MENUE] again. On the left corner of the display appears
a small 1, which indicates the selected channel. For changing the
channel use the up and down keys [▲▼]. Press [ENTER/MENUE]
to conrm. Use the up and down keys [▲▼] again to activate on
or deactivate o the requested measuring channel and press
[ENTER/MENUE] to conrm. Press [ESC] to return to the measur-
ing mode.
Short-Cut: Press 2 seconds the HOLD/MAX/MIN-Button for
activate or deactivate channel 2.
Aa a minimum one channel is active!
2.1.7 Enter Area for volume ow [ArEA]
Press [ENTER/MENUE] and use the up and down keys [▲▼] to
select ArEA. Press [ENTER/MENUE] to conrm. On the left courn-
er of the display appears a small 1, which indicates the selected
channel. For changing the channel use the up and down keys
[▲▼]. Press [ENTER/MENUE] to conrm. Use the up and down
keys [▲▼] to select the dimension unit:
c = Centimeter²
m = Meter²
For changing the number use the up key [▲]. For stpping to the
next number use the key down [▼]. If the requested dimension is
complete then press [ENTER/MENUE] to conrm.
MENUE
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6
MENUE
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6

GB
Hand Held Thermometer
CTH6500
1S = 1 second 1M = 1 minute
5S = 5 seconds 2M = 2 minutes
10S = 10 seconds 5M = 5 minutes
20S = 20 seconds 10M = 10 minutes
30S = 30 seconds 20M = 20 minutes
2079988.1 09/2011 GB/D
WIKA Operating Instructions CTH6500 19
2.1.8 Memory SETUP [Lo6]
Press [ENTER/MENUE] and use the up and down keys [▲▼] to
select Lo6. Press [ENTER/MENUE] to conrm. Use the up and
down keys [▲▼] again to start [on] or stop [o] the logger. Press
[ENTER/MENUE] to conrm. Use the up and down keys [▲▼]
again to select between automatic storage [Auto] or manually
operated storage [SPot]. Press [ENTER/MENUE] to conrm.
Use the up and down keys [▲▼] again to select between to add
on data [Add] and creating a new le [nLog6]. Press [ENTER/
MENUE] to conrm. Be selected automatic storage ant the end
you have to select the time interval:
By selcted manually operated storage you are able to save the
measurement by pressing ESC by each time.
Press [ENTER/MENUE] to conrm. Press [ESC] to return to the
measuring mode. Manual storing [Spot]. Press the key [ESC] to
store manually the measuing values.
2.2 Recalling data from the memory (HOLD MAX MIN AVE)
After pressing rst time the key [HOLD MAX MIN AVE] the actual
value will be hold on the top display line (large display). Pressing
the key [HOLD MAX MIN AVE], the saved maximum-, minimum
and average value will be displayed in the bottom display line
(small display).
Note for 2-channel instruments:
First the MAX-MIN-AVE-values of channel 1 will
be displayed – afterwards the values of channel
2 will be displayed. Is there only one probe on
a 2-channel instrument we suggest to deacti-
vate the channel without probe (see chapter
“2.1.6 channel activation [Chnl”).
MENUE
Unit Prob Lin2 CAL PrEn Chnl ArEA Lo6

GB
Hand Held Thermometer
CTH6500
2079988.1 09/2011 GB/D
WIKA Operating Instructions CTH650020
During recall of data from the memory, the
extremes (MAX MIN) and the average value
(AVE) will not continue to be calculated or carried
on.
Clearing the memory (MAX MIN AVE)
Press [CLEAR] key once to erase the stored maximum, minimum
and average from memory. On the display appears Clr. – After
erasing the memory the instrument automatically switches back to
measuring mode indicating the actual measured value again.
2.3 Measuring rate (FAST-mode)
Press [FAST/▼] key once to change the measuring rate. Now the
measuring rate to approx. 4 measurements per second. Press
[FAST/▼] key again and the instrument is back in the standard
mode (1 measurement per second).
In the fast mode the battery consumption is three
times higher than in the standard mode.
2.4 AUTO-OFF-function
dAoF = Disable Auto-o
EAoF = Enable Auto-o
Press [ESC/AUTO-OFF] key once. On the display appears EAoF.
Now the instrument switches o automatically after approx. 30
minutes. Press [ESC/AUTO-OFF] key again. On the display
appears dAoF. Now the Auto-O-function is deactivated.
After switching o and on the instrument, the
AUTO-OFF function is automatically activated.