Martel 307 User manual

HOLD
F
C
RANGE :
200
328
1370
2498 F
C
C /
REL
F
MIN
MAX
THERMOMETER
TYPE K THERMOMETER
MARTEL ELECTRONICS
307

C O N T E N T S
TITLE PAGE
I. Introduction ................................................1
II. Specifications............................................1
III. Symbol Definition and Button
Location ........................................................3
IV. Operation Instructions .........................4
4.1 Power-Up......................................................4
4.2 Connecting the Thermocouples....................4
4.3 Selecting the Temperature Unit ................... 4
4.4 Data-Hold Operation.....................................4
4.5 Relative Operation........................................4
4.6 MAX/MIN/AVG Operation .............................5
4.7 Auto Power Off .............................................5
4.8 Low Battery Condition ..................................5
4.9 Calibration Point ...........................................5

MARTEL 307
1
I. Introduction:
This instrument is a digital thermometer for use with
any K-type thermocouple as the 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:
ROperating Temperature and Humidity:
0°C ~50°C (32°F ~ 122°F) ; 0 ~ 80% RH
RStorage Temperature and Humidity:
-10°C to 60°C (14°F ~ 140°F); 0 ~ 80% RH
RAltitude 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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2
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:
Auto power off
indication
Data Hold indication
Maximum indication
Low battery indication
Negative polarity
Minmum indication
indication
Relative indication
Main display
Unit indication

MARTEL 307
3
○
1K type temperature sensor connector
○
2LCD display
○
3ON/OFF button
○
4MAX MIN Average control button
○
5HOLD button
○
6Relative readout button
○
7°C, °F control button
○
8Offset calibration screw
○
9Battery cabinet cover
MAX
24V
60V
THERMOMETER
TYPE K
MAX
HOLD
RANGE :
328
200
2498
1370
C
F
C
F
MIN
REL
CAL
OPEN
TERY
NEDA 1604 6F22 006P
9V BAT
1
8
9
2
3
4
5
6
7FC /

MARTEL 307
4
IV. Operation Instructions:
4.1 Power-Up
Press the ○
Ikey to turn the thermometer On or OFF.
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 “°C/°F” button to change it to
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 “HOLD” button. When the held
data is no longer needed, release the data-hold
operation by pressing the “HOLD” button again.
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

MARTEL 307
5
temperature.
Repeatedly pressing MAX/MIN circulates the display
mode among these options.
When the meter is under MAX/MIN operation, “△
REL” and “°C/°F ” are disabled.
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 “HOLD” button while powering on the meter. 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 ±3°C
input Adjust VR tolerance
0 °C VR3 ± 0.1 °C
190 °C VR2 ± 0.1 °C
1000 °C VR1 ± 1 °C
190 °F VR4 ± 0.1 °F
Normally, performing offset Calibration with thermally
stable ice water through VR3 will give a very good
calibration result.

MARTEL ELECTRONICS
PO Box 770, Londonderry, NH 03053 USA
Tel: [phone]
E-Mail: [email protected]
Web: http :/ / www.martelcorp.com 307-0107