Kewtech KEW301 Bedienungsanleitung
CONTENTS
TITLE PAGE
I. Introduction……………………………………..1
II. Specifications………………………………….1
III. Symbol Definition and Button Location…….4
IV. Operation Instructions……………………….6
4.1 Power-Up………………………………..6
4.2 Connection the Thermocouples…..…..6
4.3 Selecting the Temperature Scale……6
4.4 Data-Hold Operation……………..........6
4.5 T1, T2, T1-T2 Display Control……….6
4.6 Relative Operation…………………….7
4.7 MAX/MIN/AVG Operation…….….…….7
4.8 Auto Power Off…………….……….…...8
4.9 Low Battery Condition.…….…………..8
4.10 Calibration Point………………………8
4.11 Digital Output………….………………9
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I. Introduction:
This instrument is a digital thermometer for use
with any K-type thermocouple as temperature
sensor.
Temperature indication follows National Bureau
of Standards and IEC584 temperature/voltage
table for K-type thermocouples.
II. Specifications:
Numerical Display:
4 digital liquid crystal display
Measurement Range:
-200°C ~ 1370°C ; -328°F ~ 2498°F
Resolution:
-200°C ~ 200°C 0.1°C ;
800°C ~1370°C 1°C
-200°F ~ 200°F 0.1°F ; else 1°F
Maximum Voltage at Thermocouple Input:
60V DC, or 24Vrms AC
Environmental:
Operating Temperature and Humidity:
0°C ~50°C (32°F ~ 122°F) ; 0 ~ 80% RH
Storage Temperature and Humidity:
-10°C to 60°C (14°F ~ 140°F); 0 ~ 80% RH
Altitude up to 2000 meters.
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Accuracy: at (23 ± 5°C)
Range Accuracy
-200°C ~ 200°C ±(0.3% reading + 1°C)
200°C ~ 400°C ±(0.5% reading + 1°C)
400°C~1370°C ±(0.3% reading + 1°C)
-328°F ~ -400°F ±(0.5% reading + 2°F)
-200°F ~ 200°F ±(0.3% reading + 2°F)
200°F ~ 400°F ±(0.5% reading + 2°F)
400°F ~ 2498°F ±(0.3% reading + 2°F)
For T1-T2 Measurement, the accuracy is
±( 0.5% T1-T2 reading + 2°C) or
±( 0.5% T1-T2 reading + 2°F)
Temperature Coefficient:
For ambient temperatures from 0°C ~ 18°C
and 28°C ~ 50°C, for each °C ambient below
18°C or above 28°C add the following
tolerance into the accuracy spec.
0.01% of reading + 0.03°C ( 0.01% of reading
+ 0.06°F )
Note:
The basic accuracy Specification does not
include the error of the probe please refer to
the probe accuracy specification for additional
details.
Sample Rate: 0.6 times per second
Dimension: 184 ×64 ×30mm
Weight: 210g Approx.(7.4oz)
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Accessory:
K Type Bead Probe, Battery, Carrying Case,
Instruction Menu.
Option:
Soft Ware Package ( Program, RS232
Connection Cable) , AC Adapter.
Power requirement:
9 Volt Battery, NEDA 1604 or JIS 006P or
IEC6F22
Battery Life:
Approx. 100hrs with alkaline battery
AC Adapter:
9VDC ±15% 100mA ; Plug Diameter:
3.5×1.35mm
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III. Symbol Definition and Button
Location:
MainDisplay SecondDisplay
- : This indicates that the minus temperature
is sensed.
°C °F : Centigrade and Fahrenheit indication.
K: Thermocouple Type Indication
HOLD : This indicates that the display data is
being hold.
MAX : The Maximum value is now being
displayed
MIN : The Minimum value is now being
displayed
AVG : The Average value is now being
displayed.
△REL : The reading is now under Relative Mode.
: The Battery is not sufficient for proper
operation.
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○
1T1 K type temperature sensor connector
○
2T2 K type temperature sensor connector
○
3LCD display
○
4ON/OFF button
○
5HOLD button
○
6T1, T2, T1-T2 control button
○
7Relative readout button
○
8MAX MIN Average control button
○
9°C, °F control button
○
10 Offset calibration screw
○
11 Digital output connector
○
12 AC power adapter connector
○
13 Tripod connector
○
14 Battery cabinet cover
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IV. Operation Instructions:
4.1 Power-Up:
Press the ○
I key to turn the thermometer On
or OFF.
4.2 Connection the Thermocouples:
For measurement, plug the thermocouple into
the input connectors.
4.3 Selecting the Temperature Scale:
When the meter was first power on, the default
scale setting is set at Celsius (°C) scale. The
user may change it to Fahrenheit (°F) by
pressing “ °C/°F ” button and vice versa to
Celsius.
4.4 Data-Hold Operation:
The user may hold the present reading and
keep it on the display by pressing the “HOLD”
button. When the held data is no longer
needed, one may release the data-hold
operation by pressing “HOLD” button again.
When the meter is under Data Hold operation,
the “△REL”,and “ °C/°F ”button are
disabled.
4.5 T1,T2,T1-T2 Display Control:
One may select T1,T2 or T1-T2 to show on the
main display by pressing button. When
T1 or T2 is select to show on the main display,
the other temperature will be shown on the
second display. When one select T1-T2 to
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show on the main display, T1 and T2 will be
shown on the second display alternately.
4.6 Relative Operation for Main Display:
When one press the “△REL” button, the meter
will memorize the present reading and the
difference between the new reading and the
memorized data will be shown on the display.
Press the “△REL” button again to exit the
Relative operation.
4.7 MAX/MIN/AVG Operation for Main Display:
When one press the button the meter
will enter the MAX/MIN mode. Under this
mode the maximum value, minimum value and
average value of latest 8 data is kept in the
memory simultaneously and updated with
every new data.
When the MAX symbol is display, the
Maximum is shown on the display.
Press again, then the NIN symbol is on
the display and also the minimum reading.
Press again, the AVG symbol is on the
display and also the average reading.
Press again, MAX, MIN and AVG will
blink together. This means that all these data is
updated in the memory and the reading is the
present temperature.
One may press to circulate the display
mode among these options.
When the meter is under operation, “△
REL” and “ °C/°F ” are disabled.
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To exit the MAX/MIN mode, one may press
and hold for two seconds.
4.8 Auto Power Off:
By default, when the meter is powered on, it is
under auto power off mode. The meter will
power itself off after 30 minutes if no key
operation or RS232 communication. Key
combination at power on or RS232
communication can disable auto power off.
One may press and hold “HOLD” button and
then power on the meter and there will be two
successive beeps to indicate that auto power
off is disabled.
4.9 Low Battery Condition
When the battery voltage is under proper
operation requirement, the symbol will
show on the LCD and the battery need to be
replaced with new one.
4.10 Calibration Point:
Room Temperature 23 ± 3°C
input Adjust VR Tolerance
0 °C VR1 ± 0.1 °C
190 °C VR2 ± 0.1 °C
1000 °C VR3 ± 1 °C
1900 °F VR4 ± 1 °F
Normally, performing offset Calibration with
thermal stabled ice water through VR1 will give
a very good calibration result.
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