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TYPE K THERMOMETER
T 2
T 1
MARTEL ELECTRONICS
THERMOMETER
MAX
MIN
HOLD
REL
F
C /
RANGE :
200
328
1370
C
C
F
F
2498
Page 2
C O N T E N T S
TITLE PAGE
I. Introduction
II. Specifications
III. Symbol Definition and Button
Location
IV. Operating Instructions
4.1 Power-Up ............................................. 4
4.2 Connecting the Thermocouples ...........
4.3 Selecting the Temperature Unit............4
4.4 Data-Hold Operation ............................
4.5 Relative Operation ...............................
4.6 MAX/MIN/AVG Operation.....................
4.7 Auto Power Off..................................... 5
4.8 Low Battery Condition ..........................
4.9 Calibration Point...................................
............................................. 1
......................................... 1
..................................................... 3
...................... 4
4
4
4
5
5
5
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MARTEL 308
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; 200°C ~1370°C: 1°C
-200°F~ 200°F: 0.1°F; 200°F ~2498°F: 1°F
Maximum Voltage at Thermocouple Input:
60V DC, or 24Vrms AC
Environmental:
R Operating Temperature and Humidity:
0°C ~50°C (32°F ~ 122°F) ; 0 ~ 80% RH
R Storage Temperature and Humidity:
-10°C to 60°C (14°F ~ 140°F); 0 ~ 80% RH
R Altitude up to 2000 meters.
Sample Rate: 0.6 times per second
Dimension (LxWxH): 2.51”x2.12”x1.33” (64x54x34
mm)
Weight: 6.3 oz. (180g); approximate
Accessories:
K-Type Bead Probe, Battery, Instruction Manual
Power Requirement:
9 Volt Battery, NEDA 1604, JIS 006P, or IEC6F22
Battery Life:
Approx. 150 hrs with alkaline battery
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MARTEL 308
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 ~ -200°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)
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.
III. Symbol Definition and Button Location:
Data Hold indication
Minmum indication
Maximum indication
Low battery indication
Negative polarity
indication
Auto power off
indication
Relative indication
Unit indication
Main display
Second display
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MARTEL 308
2
MAX
24V
60V
T2
1
T1
T 2
RANGE :
T 1
TYPE K
THERMOMETER
MAX
MIN
HOLD
REL
C /
200
C
F
328
9
F
1370
C
2498 F
3
4
5
6
7
8
1
T1 K type temperature sensor connector
○
2
T2 K type temperature sensor connector
○
3
LCD display
○
4
ON/OFF button
○
5
MAX MIN Average control button
○
6
HOLD button
○
7
Relative readout button
○
8
°C, °F control button
○
9
Offset calibration screw
○
10
Battery cabinet cover
○
TERY
9V BAT
NEDA 1604 6F22 006P
CAL
OPEN
10
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MARTEL 308
IV. Operating Instructions:
4.1 Power-Up
Press the ○
4.2 Connecting the Thermocouples
Plug the thermocouples into the input connectors.
4.3 Selecting the Temperature Unit
When the meter is powered on, the default unit is
Celsius (°C). Press the “
Fahrenheit (°F). Press it again to revert to Celsius.
4.4 Data-Hold Operation
The present reading may be held and kept on the
display by pressing the “
data is no longer needed, release the data-hold
operation by pressing the “
When the meter is in the Data Hold operating mode,
the “△ REL”, MAX/MIN, and “°C/°F” buttons are
disabled.
4.5 Relative Operation:
Pressing the “△ REL” button causes the meter to
memorize the present reading. 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.
4.6 MAX/MIN Operation:
Pressing the MAX/MIN button causes the meter to
enter the MAX/MIN mode. Under this mode, the
maximum and minimum values are stored in memory
simultaneously and updated with every new data
reading.
When the MAX symbol is displayed, the Maximum is
shown on the display.
Pressing MAX/MIN again will display both the MIN
symbol and the minimum reading.
Pressing MAX/MIN again causes the MAX and MIN
indicators to blink together. This means that all data is
updated in the memory and the reading is the present
I
key to turn the thermometer On or OFF.
°C/°F
” button to change it to
HOLD
” button. When the held
HOLD” button again.
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MARTEL 308
temperature.
Repeatedly pressing MAX/MIN circulates the display
mode among these options.
When the meter is under MAX/MIN operation, “△
REL” and
To exit the MAX/MIN mode, press and hold MAX/MIN
for two seconds.
4.7 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 is performed. To
disable the auto power off function, press and hold
the “
auto power off symbol will disappear to indicate that
auto power off is disabled.
4.8 Low Battery Condition
When the battery voltage is below that for proper
operation, the symbol will show on the LCD.
Replace the battery.
4.9 Calibration Point:
Room Temperature 23
Normally, performing offset Calibration with thermally
stable ice water through VR3 will give a very good
calibration result.
°C/°F ” are disabled.
“
HOLD” button while powering on the meter. The
input Adjust VR tolerance
0 °C VR3
190 °C VR2 ± 0.1 °C
1000 °C VR1 ± 1 °C
190 °F VR4 ± 0.1 °F
± 3°C
±
0.1 °C
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PO Box 770, Londonderry, NH 03053 USA
Tel: 800-821-0023
E-Mail: sales@martelcorp.com
Web: http
MARTEL ELECTRONICS
/ / www.martelcorp.com
:
308-0107
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