HT HT4011 User manual

Copyright HT ITALIA 2014 Release EN 1.01 - 21/02/2014
ENGLISH
User manual
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HT4011
EN – 1
Table of contents:
1.PRECAUTIONS AND SAFETY MEASURES...............................................................2
1.1.Preliminary instructions..................................................................................................... 2
1.2.During use......................................................................................................................... 3
1.3.After use............................................................................................................................ 3
1.4.Definition of measurement (overvoltage) category............................................................ 3
2.GENERAL DESCRIPTION...........................................................................................4
2.1.Measuring average values and TRMS values................................................................... 4
2.2.Definition of true root mean square value and crest factor................................................ 4
3.PREPARATION FOR USE...........................................................................................5
3.1.Initial checks...................................................................................................................... 5
3.2.Instrument power supply................................................................................................... 5
3.3.Calibration......................................................................................................................... 5
3.4.Storage.............................................................................................................................. 5
4.OPERATING INSTRUCTIONS.....................................................................................6
4.1.Instrument description....................................................................................................... 6
4.1.1.Description of the controls.......................................................................................................... 6
4.2.Description of function keys .............................................................................................. 7
4.2.1.HOLD key................................................................................................................................... 7
4.2.2.REL key...................................................................................................................................... 7
4.2.3.Hz% key...................................................................................................................................... 7
4.2.4.MODE key .................................................................................................................................. 7
4.3.Description of rotary switch functions................................................................................ 8
4.3.1.DC voltage measurement........................................................................................................... 8
4.3.2.AC voltage measurement........................................................................................................... 9
4.3.3.Frequency and Duty Cycle measurement................................................................................ 10
4.3.4.Resistance measurement......................................................................................................... 11
4.3.5.Capacitance measurement....................................................................................................... 12
4.3.6.Continuity test and diode test................................................................................................... 13
4.3.7.Temperature measurement in °C and °F ................................................................................. 14
4.3.8.AC current measurement ......................................................................................................... 15
5.MAINTENANCE .........................................................................................................16
5.1.General information......................................................................................................... 16
5.2.Replacing the battery ...................................................................................................... 16
5.3.Cleaning the instrument .................................................................................................. 16
5.4.End of life ........................................................................................................................ 16
6.TECHNICAL SPECIFICATIONS ................................................................................17
6.1.Technical characteristics................................................................................................. 17
6.1.1.Reference standards................................................................................................................ 18
6.1.2.General characteristics............................................................................................................. 18
6.2.Environment.................................................................................................................... 18
6.2.1.Environmental conditions for use ............................................................................................. 18
6.3.Accessories provided...................................................................................................... 19
6.4.Optional accessories....................................................................................................... 19
7.SERVICE....................................................................................................................20
7.1.Warranty conditions......................................................................................................... 20
7.2.Service ............................................................................................................................ 20
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HT4011
EN – 2
1. PRECAUTIONS AND SAFETY MEASURES
The instrument has been designed in compliance with directive IEC/EN61010-1 relevant to
electronic measuring instruments. For your safety and in order to prevent damaging the
instrument, please carefully follow the procedures described in this manual and read all
notes preceded by the symbol with the utmost attention.
Before and after carrying out the measurements, carefully observe the following
instructions:
Do not carry out any voltage or current measurement in humid environments.
Do not carry out any measurements in case gas, explosive materials or flammables are
present, or in dusty environments.
Avoid any contact with the circuit being measured if no measurements are being
carried out.
Avoid any contact with exposed metal parts, with unused measuring probes, circuits,
etc.
Do not carry out any measurement in case you find anomalies in the instrument such
as deformation, breaks, substance leaks, absence of display on the screen, etc.
Pay special attention when measuring voltages higher than 20V, since a risk of
electrical shock exists.
In this manual, and on the instrument, the following symbols are used:
Warning: observe the instructions given in this manual; improper use could
damage the instrument or its components.
High voltage danger: electrical shock hazard.
Double-insulated meter.
AC voltage or current
DC voltage
Connection to earth
1.1. PRELIMINARY INSTRUCTIONS
This instrument has been designed for use in environments of pollution degree 2.
It can be used for CURRENT and VOLTAGE measurements on installations with
measurement category CAT III 600V. For a definition of measurement categories, see
§ 1.4
We recommend following the normal safety rules devised to protect the user against
dangerous currents and the instrument against incorrect use.
Only the leads supplied with the instrument guarantee compliance with the safety
standards. They must be in good conditions and replaced with identical models, when
necessary.
Do not test circuits exceeding the specified current and voltage limits.
Check that the battery is correctly inserted
Before connecting the test leads to the circuit to be tested, make sure that the switch is
correctly set.
Make sure that the LCD display and the switch indicate the same function.
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HT4011
EN – 3
1.2. DURING USE
Please carefully read the following recommendations and instructions:
CAUTION
Failure to comply with the Caution notes may damage the instrument and/or
its components or be a source of danger for the operator.
Before activating the switch, remove the conductor from the clamp jaw or disconnect
the test leads from the circuit under test.
When the instrument is connected to the circuit under test, do not touch any unused
terminal.
Avoid measuring resistance if external voltages are present. Even if the instrument is
protected, excessive voltage could cause a malfunction of the clamp.
When measuring current with the clamp jaws, first remove the test leads from the
instruments input jacks.
During current measurement, any other current near the clamp may affect
measurement precision.
When measuring current, always put the conductor as near as possible to the middle
of the clamp jaw, to obtain the most accurate reading.
While measuring, if the value or the sign of the quantity being measured remain
unchanged, check if the HOLD function is enabled.
1.3. AFTER USE
When measurement is complete, switch OFF the instrument.
If you expect not to use the instrument for a long period, remove the battery.
1.4. DEFINITION OF MEASUREMENT (OVERVOLTAGE) CATEGORY
Standard “IEC/EN61010-1: Safety requirements for electrical equipment for measurement,
control and laboratory use, Part 1: General requirements” defines what measurement
category is. § 6.7.4: Measured circuits, reads:
(OMISSIS)
Circuits are divided into the following measurement categories:
Measurement category IV is for measurements performed at the source of the low-
voltage installation.
Examples are electricity meters and measurements on primary overcurrent protection devices
and ripple control units.
Measurement category III is for measurements performed on installations inside
buildings.
Examples are measurements on distribution boards, circuit breakers, wiring, including cables,
bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and equipment for
industrial use and some other equipment, for example, stationary motors with permanent
connection to fixed installation.
Measurement category II is for measurements performed on circuits directly
connected to the low-voltage installation.
Examples are measurements on household appliances and similar equipment.
Measurement category I is for measurements performed on circuits not directly
connected to MAINS.
Examples are measurements on circuits not derived from MAINS, and specially protected
(internal) MAINS-derived circuits. In the latter case, transient stresses are variable; for that
reason, the standard requires that the transient withstand capability of the equipment is made
known to the user.
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HT4011
EN – 4
2. GENERAL DESCRIPTION
The instrument carries out the following measurements:
DC and AC voltage up to 600V
AC current up to 400A
Resistance and continuity test with buzzer
Capacitance
Frequency with leads
Duty Cycle
Diode test
Temperature with K probe
Detection of presence of AC voltage with and without contact with in-built sensor.
Each of these functions may be selected through a 8-position rotary switch, including the
OFF position and a key for enabling the HOLD function. The instrument also has a
“MODE”, “Hz%” and “REL” key. For their use, please refer to § 4.2. The selected quantity
appears on the LCD display with the indication of the measuring unit and of the enabled
functions.
2.1. MEASURING AVERAGE VALUES AND TRMS VALUES
Measuring instruments of alternating quantities are divided into two big families:
AVERAGE-VALUE meters: instruments measuring the value of the sole wave at
fundamental frequency (50 or 60 Hz).
TRMS (True Root Mean Square) VALUE meters: instruments measuring the TRMS
value of the quantity being tested.
With a perfectly sinusoidal wave, the two families of instruments provide identical results.
With distorted waves, instead, the readings shall differ. Average-value meters provide the
RMS value of the sole fundamental wave; TRSM meters, instead, provide the RMS value
of the whole wave, including harmonics (within the instruments bandwidth). Therefore, by
measuring the same quantity with instruments from both families, the values obtained are
identical only if the wave is perfectly sinusoidal. In case it is distorted, TRMS meters shall
provide higher values than the values read by average-value meters.
2.2. DEFINITION OF TRUE ROOT MEAN SQUARE VALUE AND CREST FACTOR
The root mean square value of current is defined as follows: “In a time equal to a period,
an alternating current with a root mean square value of 1A intensity, circulating on a
resistor, dissipates the same energy that, during the same time, would be dissipated by a
direct current with an intensity of 1A”. This definition results in the numeric expression:
G= 
Tt
t
dttg
T
0
0
)(
12The root mean square value is indicated with the acronym RMS.
The Crest Factor is defined as the relationship between the Peak Value of a signal and its
RMS value: CF (G)= RMS
p
G
GThis value changes with the signal waveform, for a purely
sinusoidal wave it is 2=1.41. In case of distortion, the Crest Factor takes higher values
as wave distortion increases.
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HT4011
EN – 5
3. PREPARATION FOR USE
3.1. INITIAL CHECKS
Before shipping, the instrument has been checked from an electric as well as mechanical
point of view.
All possible precautions have been taken so that the instrument is delivered undamaged.
However, we recommend generally checking the instrument in order to detect possible
damage suffered during transport. In case anomalies are found, immediately contact the
forwarding agent.
We also recommend checking that the packaging contains all components indicated in §
6.3. In case of discrepancy, please contact the Dealer.
In case the instrument should be returned, please follow the instructions given in § 7.
3.2. INSTRUMENT POWER SUPPLY
The instrument is supplied with two 1.5V AAA LR03 batteries, included in the package.
The “ “ symbol appears when the battery is nearly flat. Replace the battery by
following the instructions given in § 5.2.
The instrument is also equipped with an Auto Power OFF function (which cannot be
disabled) which automatically switches off the instrument approx. 30 minutes after the last
operation was carried out.
3.3. CALIBRATION
The instrument has the technical specifications described in this manual. The instruments
performance is guaranteed for 12 months.
3.4. STORAGE
In order to guarantee precise measurement, after a long storage time under extreme
environmental conditions, wait for the instrument to come back to normal condition (see §
6.2.1).
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HT4011
EN – 6
4. OPERATING INSTRUCTIONS
4.1. INSTRUMENT DESCRIPTION
4.1.1. Description of the controls
CAPTION:
1. Inductive clamp jaw
2. AC voltage detector
3. Rotary selector switch
4. Jaw trigger
5. HOLD key
6. MODE key
7. REL key
8. Hz% key
9. LCD display
10.Input terminal COM
11.Input terminal
VCAPHz%Temp
Fig. 1: Instrument description
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HT4011
EN – 7
4.2. DESCRIPTION OF FUNCTION KEYS
4.2.1. HOLD key
Short pressing the “HOLD” key activates the function Data HOLD, i.e. the value of the
measured quantity is frozen. The message “HOLD” appears on the display.
This operating mode is disabled when the “HOLD” key is pressed again or the switch is
operated.
4.2.2. REL key
With the instrument's switch set to positions , , and AC current, this key allows zeroing
the displayed value and carrying out a relative measurement of the quantity being tested.
When pressing the REL key for the first time, the value of the quantity being tested is
saved as offset for the following measurements. The message “REL” appears on the
display. The instrument shows the relative value obtained as current value – offset. This
function is not active in resistance measurements, continuity, temperature and capacitance
tests, duty cycle tests and diode test. Press the REL key again or turn the rotary switch to
exit the function.
4.2.3. Hz% key
With the instrument's rotary switch set to positions , Hz, by pressing the Hz% key you
can switch to frequency (Hz) or duty cycle measurement (%).
4.2.4. MODE key
The MODE key is used to select resistance measurement, continuity test with buzzer, and
diode test with the instrument's rotary switch set to position and to select AC and
DC voltage measurement with the switch set to position , , Hz.
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HT4011
EN – 8
4.3. DESCRIPTION OF ROTARY SWITCH FUNCTIONS
4.3.1. DC voltage measurement
CAUTION
The maximum input DC voltage is 600Vrms. Do not measure voltages
exceeding the limits given in this manual. Exceeding these limits could
result in electrical shocks to the user and damage to the instrument.
Fig. 2: Use of the clamp for DC voltage measurement
1. Select the position.
2. Insert the red cable into input terminal VCAPHz%Temp and the black cable into
input terminal COM (Fig. 2).
3. Position the test leads in the desired points of the circuit to be measured. The display
shows the value of voltage.
4. If the symbol “O.L” is displayed, this indicates overload status.
5. To use the HOLD and REL functions, please refer to § 4.2.
CAUTION
Due to the high input impedance, it may take some time for the
instrument to zero the display.
The changing value shown on the display with open input terminals is
not to be considered a problem of the instrument and these values
are not added by the instrument while carrying out a real measurement.
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HT4011
EN – 9
4.3.2. AC voltage measurement
CAUTION
The maximum input AC voltage is 600V. Do not measure voltages
exceeding the limits given in this manual. Exceeding these limits could
result in electrical shocks to the user and damage to the instrument.
Fig. 3: Use of the clamp for AC voltage measurement
1. Switch on the instrument in any position of selector, near it an AC source and look for
the red LED at the clamp's base (see Fig. 1 – Part 2) to turn on. This indicates that the
instrument has detected the AC source's presence
2. Select the position , , Hz.
3. Insert the red cable into input terminal VCAPHz%Temp and the black cable into
input terminal COM (Fig. 3).
4. Position the test leads in the desired points of the circuit to be measured. The display
shows the value of voltage.
5. If the symbol “O.L” is displayed, this indicates overload status.
6. To use the HOLD and REL functions, please refer to § 4.2.
CAUTION
Due to the high input impedance, it may take some time for the
instrument to zero the display.
The changing value shown on the display with open input terminals is
not to be considered a problem of the instrument and these values
are not added by the instrument while carrying out a real measurement.
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HT4011
EN – 10
4.3.3. Frequency and Duty Cycle measurement
CAUTION
When measuring frequency with leads, the maximum input AC voltage is
600Vrms. Do not measure voltages exceeding the limits given in this
manual. Exceeding these limits could result in electrical shocks to the
user and damage to the instrument.
When measuring frequency with the clamp, make sure that all the
instrument's input terminals are disconnected.
Fig. 4: Use of the clamp for frequency measurement and duty cycle
1. Select position , , Hz for measuring frequency with leads.
2. Press the Hz% key cyclically until the symbol “Hz” is displayed for measuring frequency
or the symbol “%” for duty cycle measurement.
3. Insert the red cable into input terminal VCAPHz%Temp and the black cable into
input terminal COM (Fig. 4 – left side) for measuring frequency with leads. The value of
frequency (Hz) or of duty cycle (%) is shown on the display.
4. If the symbol “O.L” is displayed, this indicates overload status.
5. To use the HOLD function, please refer to § 4.2.
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HT4011
EN – 11
4.3.4. Resistance measurement
CAUTION
Before attempting any resistance measurement, remove power from the
circuit under test and discharge all capacitors, if present.
Fig. 5: Use of the clamp for Resistance measurement
1. Select the position 
2. Insert the red cable into input terminal VCAPHz%Temp and the black cable into
input terminal COM.
3. Position the test leads in the desired points of the circuit to be measured (Fig. 5). The
display shows the value of resistance.
4. If the symbol “O.L” is displayed, this indicates overload status.
5. To use the HOLD function, please refer to § 4.2.
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HT4011
EN – 12
4.3.5. Capacitance measurement
CAUTION
Before carrying out capacitance measurements on circuits or capacitors, cut
off power supply from the circuit being tested and let all capacitance in it be
discharged.
Fig. 6: Use of the clamp for capacitance measurement
1. Select the CAP position.
2. Press the MODE key cyclically until the symbol “nF” is displayed.
3. Insert the red cable into input terminal VCAPHz%Temp and the black cable into
input terminal COM.
4. Position the test leads in the desired points of the circuit to be measured (Fig. 6). The
display shows the value of capacitance. When measuring capacitance, the analogue
analogue graphic bar is deactivated.
5. If the symbol “O.L” is displayed, this indicates overload status.
6. To use the HOLD and REL functions, please refer to § 4.2.
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HT4011
EN – 13
4.3.6. Continuity test and diode test
CAUTION
Before attempting any resistance measurement, remove power from the
circuit under test and discharge all capacitors, if present.
Fig. 7: Use of the clamp for continuity test and diode test
1. Select the position 
2. Press the MODE key cyclically until the symbol “ “ is displayed to activate continuity
test.
3. Insert the red cable into input terminal VCAPHz%Temp and the black cable into
input terminal COM and carry out the continuity test of the object to be measured (see
Fig. 7– left side). An buzzer sounds when the measured value of resistance is lower
than 30
4. Press the MODE key to select diode test. The symbol “ “ appears on the display.
5. Connect the red lead to the anode of the diode and the black lead to the cathode in
case direct polarization measurement is carried out (see Fig. 7 – right side). Invert the
position of the leads in case reverse polarization measurement is carried out.
6. Values on the display between 0.4V and 0.7V (direct) and “OL” (reverse) indicate
correct connection. A value “0mV” indicates that the device is short-circuited, while
“OL” in both directions indicated an interrupted device.
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HT4011
EN – 14
4.3.7. Temperature measurement in °C and °F
CAUTION
Do not put the temperature probe into contact with live surfaces. Voltages
higher than 30Vrms or 60VDC imply electrical shock hazard.
Fig. 8: Use of the clamp for temperature measurement
1. Select the Temp°C or Temp°F position.
2. Insert the K wire probe provided into input terminal VCAPHz%Temp and COM
by means of the relevant adapter, respecting the polarity indicated in Fig. 8. The
display shows the value of temperature.
3. To use the HOLD function, please refer to § 4.2.
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HT4011
EN – 15
4.3.8. AC current measurement
CAUTION
Before attempting any measurement disconnect all the test leads from the
circuit under test and from the meter's input terminals.
Fig. 9: Use of the clamp for AC current measurement
1. Select position 40A or 400A
2. Insert the cable in the middle of the clamp jaws, in order to obtain accurate measures.
The display shows the value of AC current.
3. If the symbol “O.L” is displayed, this indicates overload status. In this case, position the
rotary switch to a higher measuring range.
4. To use the HOLD and PEAK functions, please refer to § 4.2.
CAUTION
A possible value displayed with the instrument not in measuring mode is
not to be considered a problem of the instrument and these values are
not added by the instrument while carrying out a real measurement.
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HT4011
EN – 16
5. MAINTENANCE
5.1. GENERAL INFORMATION
1. The instrument you purchased is a precision instrument. While using and storing the
instrument, carefully observe the recommendations listed in this manual in order to
prevent possible damage or danger during use.
2. Do not use the instrument in environments with high humidity levels or high
temperatures. Do not expose to direct sunlight.
3. Always switch off the instrument after use. In case the instrument is not to be used for a
long time, remove the battery to avoid liquid leaks that could damage the instruments
internal circuits.
5.2. REPLACING THE BATTERY
When the LCD display shows the symbol “ “, it is necessary to replace the battery.
CAUTION
Only expert technicians should perform this operation. Before carrying out
this operation, make sure you have removed all cables from the input
terminals or the cable being tested from inside the clamp jaw.
1. Turn the rotary switch to the OFF position.
2. Disconnect the cables from the input terminals and the cable being tested from the
clamp jaw.
3. Loosen the battery cover fastening screw and remove the cover.
4. Disconnect the battery from the connector.
5. Connect the new batteries to the connector (see § 6.1.2) and pay attention to correct
polarity.
6. Position the battery cover back over the compartment and fasten it with the relevant
screw.
7. Do not scatter old batteries into the environment. Use the relevant containers for
battery disposal.
5.3. CLEANING THE INSTRUMENT
Use a soft and dry cloth to clean the instrument. Never use wet cloths, solvents, water, etc.
5.4. END OF LIFE
CAUTION: this symbol found on the instrument indicates that the appliance, its
accessories and the battery must be collected separately and correctly disposed
of.
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HT4011
EN – 17
6. TECHNICAL SPECIFICATIONS
6.1. TECHNICAL CHARACTERISTICS
Accuracy is calculated as ± [% reading + (number of digits) x resolution]. It is referred to a
temperature 18°C 28°C with relative humidity <75% RH.
AC Voltage (Autorange)
Range Resolution Accuracy Input
impedance Bandwidth Overvoltage protection
4,000V 0,001V
(1.8%rdg + 8digits) 10M50-400Hz 600V
DC/ACrms
40.00V 0.01V
400.0V 0.1V
600V 1V
(2.5%rdg + 8digits)
Integrated sensor for AC voltage detection: LED on for phase-earth voltage > 100V, 50/60Hz.
DC Voltage (Autorange)
Range Resolution Accuracy Input
impedance Overvoltage protection
400.0mV 0.1mV
(0.8%rdg+2digits)
10M600AACrms
4.000V 0,001V (1.5%rdg + 2digits)
40.00V 0.01V
400.0V 0.1V
600V 1V
(2%rdg + 2digits)
AC Current
Range Resolution Accuracy Bandwidth Overvoltageprotection
40.00A 0.01A
(2.5%rdg + 8digits) 50-60Hz 400AACrms
400.0A 0.1A
(2.8%rdg + 8digits)
Resistance and continuity test (Autorange)
Range Resolution Accuracy Buzzer Overvoltageprotection
400.00.1(1.0%rdg + 4digits)
<30600VDC/ACrms
4.000k0.001k

(1.5%rdg+2digits)40.00k0.01k
400.0k0.1k
4.000M0.001M

(2.5%rdg+3digits)
40.00M0.01M

(3.5%rdg+5digits)
Continuity test current: < 0.5mA
Capacitance (Autorange)
Range Resolution Accuracy Overvoltageprotection
40.00nF 0.01nF
(4.0%rdg+20digits)
600VDC/ACrms
400.0nF 0.1nF (3%rdg+5digits)
4.000F 0.001F
4000F 0.01F (4.0%rdg+10digits)
100.0F 01F
Diode test
Range Test current Open-circuit voltage
0.3mA typical 1.5VDC
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HT4011
EN – 18
Frequency with leads (Autorange)
Range Resolution Accuracy Sensitivity Overvoltage protection
10.00Hz 49.99Hz 0.01Hz
(1.5%rdg+2digits) 15Vrms 600VDC/ACrms
50.0Hz 499.9Hz 0.1Hz
0.500kHz 4.999kHz 0,001kHz
5.00kHz 10.0kHz 0.01kHz
Duty cycle (Autorange)
Range Resolution Accuracy
0.5% 99.0% 0.1%

(1.2%rdg + 2digits)
100s Pulse width 100ms ; Pulse frequency: 100Hz 150kHz; Sensitivity >10Vrms
Temperature with K probe (Autorange)
Range Resolution Accuracy (*) Overvoltageprotection
-20.0 399°C 0.1°C (3%rdg+5°C) 250VDC/ACrms
400 760°C 1°C
-4 400°F 0.1°F (3%rdg+9°F)
400 1400°F 1°F
(*) Accuracy of K-probe not considered
6.1.1. Reference standards
Safety: IEC/EN61010-1
Insulation: double insulation
Pollution level: 2
Max operating altitude: 2000m (6562 ft)
Overvoltage category: CAT III 600V to ground
6.1.2. General characteristics
Mechanical characteristics
Size (L x W x H): 200 x 66 x 37mm ; (8 x 3 x 1in)
Weight (battery included): 205g (7 ounces)
Max. cable diameter: 30mm (1in)
Power supply
Battery type: 2 batteries x 1.5V AAA
Low battery indication: The display shows the symbol “ “ when the
voltage supplied by the battery is too low.
AutoPowerOff: after 30 minutes (may not be disabled)
Display
Characteristics: 4 dgt LCD max 4000 point, sign and decimal point
Sampling rate: 2 measurements per second
Conversion type: Mean value
6.2. ENVIRONMENT
6.2.1. Environmental conditions for use
Reference temperature: 18°C 28°C ; (64°F 82°F)
Operating temperature: 5 ÷ 40 °C ; (41°F 104°F)
Allowable relative humidity: <80%RH
Storage temperature: -20 ÷ 60 °C ; (-4°F 140°F)
Storage humidity: <80%RH
This instrument satisfies the requirements of Low Voltage Directive 2006/95/EC
(LVD) and of EMC Directive 2004/108/EC
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HT4011
EN – 19
6.3. ACCESSORIES PROVIDED
Pair of 2mm test leads
Adapter + K-type wire probe
Carrying bag
Batteries (not fitted)
User manual
6.4. OPTIONAL ACCESSORIES
Model Description Temperature
range Accuracy
(at 100°C) Probe
length (mm)
Probe
diameter
(mm)
TK107 Air and gas temperature -40

800 °C ± 2.2rdg 200 1.5
TK108 Internal temperature of
semisolid substances -40 800 °C ± 2.2rdg 200 3
TK109 Internal temperature of
liquids -40 800 °C ± 2.2rdg 200 4
TK110 Surface temperature -40

400 °C ± 2.2rdg 200 5
TK111 Surface temperature with
fixed tip at 90°C -40 400 °C ± 2.2rdg 260 5
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