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:
Main Display Second Display
-
: 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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○1 T1 K type temperature sensor connector
○
2
T2 K type temperature sensor connector
○
3
LCD display
○
4
ON/OFF button
○
5
HOLD button
○
6
T1, T2, T1-T2 control button
○
7
Relative readout button
○
8
MAX 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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4.11 Digital Output:
The Digital Output is a 9600bps N 81 serial
interface. The RX is a 5V normal high input
port.
The TX is a 5V normal
high output port.
The command of
Digital Output is list
below.
RS232
command
Function Remarks
K(ASC 4BH) Ask for model No. Send 4 bytes
D(ASC 44H)
Ask for main
display
Range, Data, Unit
Send 22 bytes
B(ASC 42H)
Ask for secondary
display
Range, Data, Unit
Send 22 bytes
S(ASH 53H) Ask Status Send 13 bytes
H(ASC 48H) Hold button
T(ASC 54H) TIMER button
M(ASC 4DH)
AVG/MAX/MIN
button
N(ASC 4EH)
Exit AVG/MAX/MIN
mode
R(ASC 52H) REL button
C(ASC 43H) C/F button
A(ASC 41H)
Inquire all encoded
data
Send encoded
8 byte
‧ Command K:
Return 4 bytes. For example, when sends
command "K" to meter, it will return "3","0","1",
ASCII(13) .
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‧ Command D:
Return data of main window.
Range: T1, T2, T1-T2 (7bytes), the unused
characters is left as space ASC(13).
Data: ±9999.9,-OL,OL ( 7bytes include polarity
and decimal point), Unit: C,F(5bytes)
When the meter receive the D command, it will
send :
Range□Data□Unit.
( where □ represent space (ASC(20H) )
For example:
T1□□□□□□-199.9□□C□□□□
(0x13) represent T1,- 199.9°C, The total byte
number should be
7+1+7+1+5+chr(13)=22Bytes
‧ Command B:
Return the contents in the second display.
‧ Command S:
Return the operation mode HOLD□MAX□
REL, if the mode is not entered, the related
characters will be left as space.
For example:
when the meter is under MAX display, the
meter will return: □□□□□MAX□□□□
‧ Command T:
Equivalent to one pushing on the HOLD
button.
‧ Command M:
Equivalent to one pushing on the HOLD AVG
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/MAX/MIN button and no message is returned.
‧ Command R:
Equivalent to one pushing on the REL button
and no message is returned.
‧ Command C:
Equivalent to one pushing on the C/F button
and no message is returned.
‧ Command A:
1nd BYTE:
The first byte is the start byte, it value is 2.
2
nd
BYTE:
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
C/F Low Bat Hold REL K/J MAX/AVG/MIN
bit 2 bit 1 bit0
0 0 0 → normal mode
0 0 1 → MAXIMUN mode
0 1 0 → MINIMUN mode
1 0 0 → AVG mode
1 1 1 → calculate MAX/MIN/AVG in
back-ground and lcd "MAX"
"AVG" "MIN" will flash.
bit3: 1→ 0→ K TYPE 1→ J TYPE
bit4: 1→ REL
bit5: 1- HOLD 0→ not HOLD
bit6: 1→ LOW BATTERY 0→ BATTERY NORMAL
bit7: 1→ C 0→ F
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3
nd
BYTE:
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
point minus OL point minus OL
bit0: 1→ main window value is OL 0→ not OL
bit1: 1→ main window value is minus,
0→ main window value is plus.
bit2: 1→ 4
th
byte and 5th byte represent ####
0→ 4
th
byte and 5th byte represent ###.#
bit3: 1→ sub window value is OL 0→ not OL
bit4: 1→ sub window value is minus,
0→ sub window value is plus.
bit5: 1→ 6
th
byte and 7th byte represent ####
0→ 6
th
byte and 7th byte represent ###.#
bit7 bit6:
00→ Main window is T1-T2, sub window is T1
01→ Main window is T1-T2, sub window is T2
10→ Main window is T1, sub window is T2
11→ Main window is T2, sub window is T1
4
th
BYTE:
First two BCD code of main window value.
5
th
BYTE:
Last two BCD code of main window value
6
th
BYTE:
First two BCD code of sub window value.
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7
th
BYTE:
Last two BCD code of sub window value.
8
th
BYTE:
The last byte is the end byte, it value is 3, first
and last byte are used to check frame error.
GCBKEW301-02000
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