Center C315 User manual

315-01 FEB. 2002

TITLE PAGE
I. Introduction ....................................... 1
II. Specifications.................................... 1
III. Symbol Definition and Button
Location............................................. 2
IV. Operating Instructions.................... 3
4.1 Power-Up ....................................... 3
4.2 Selecting the Temperature Unit...... 3
4.3 Data-Hold Operation ...................... 3
4.4 Relative Operation.......................... 3
4.5 MAX/MIN/AVG Operation............... 3
4.6 Auto Power Off............................... 4
4.7 Low Battery Condition .................... 4
4.8 Calibration Point............................. 4
4.9 Calibration Procedure..................... 4
4.9.1 Temperature calibration............ 4
4.9.2 Humidity Calibration.................. 5
4.9.3 Recall factory calibration data... 6
C O N T E N T S

Humidity Temperature
1
I. Introduction:
This instrument is a digital meter that measures
both humidity and temperature.
II. Specifications:
Display: Dual display
Measurement Range:
Humidity: 0%RH ~ 100%RH
Temperature: -20°C ~ 60°C
(-4°F ~ 140°F)
Accuracy: (at 23°C ± 5°C)
Range Accuracy
5% RH ~ 95% RH ±3% RH
-20°C ~ 60°C ±0.8°C
-4°F ~ -140°F ±1.6°F
Resolution: 0.1%RH , 0.1°C / 0.1°F
Response Time: (@ t90; in slowly moving air)
Humidity: 180 sec
Temperature: 10 sec
Operating Conditions: 0°C ~ 40°C; <80% RH
Storage Conditions: -10°C ~ 60°C; <70% RH
Altitude: Up to 2000 meters.
Sample Rate: 2.5 times per second
Battery: 9 V Battery,
NEDA 1604 or JIS 006P
or IEC6F22
Battery Life: 85-hours continuous;
(with alkaline battery)
Dimension: 240x54x34 mm
9.5x2.1x1.3 inches
Weight: Approx.180g (6.4 oz.)
Accessories: Battery, instruction
manual

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2
III. Symbols and Buttons:
○
1Dust cover ○ 5HOLD button
○
2LCD display ○ 6RELATIVE button
○
3ON/OFF button ○ 7°C/°F select button
○
4MAX/MIN button ○ 8Battery cover
HUMIDITY:
TEMP:
4
6
7
5
3
2
F1404F
0%RH100
MIN
MAX
°F
C20
°C /
C60
REL
HOLD
8
1
HUMIDITY
OPEN
9V BAT
NEDA 1604 6F22 006P
TERY
Auto power off
indication
Data Hold indication
Minmum indication
Low battery indication
Maximum indication
Temperature displa
y
Relative indication
Humidity display
Unit indication

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IV. Operation Instructions:
4.1 Power-Up:
Press the ○
Ikey to turn the
Humidity/Temperature meter ON or OFF.
4.2 Selecting Temperature Units:
When the meter is first powered on, the default
scale setting is set to the Celsius (°C ) scale. To
change to Fahrenheit (°F) press the ”C/°F” button.
Press again to revert to Celsius. The next time the
meter is turned on, the scale setting will be the
same as it was when you powered off last time.
4.3 Data-Hold Operation:
The present reading may be held 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 mode, the
“REL”, “MAX/MIN”, and “°C/°F” buttons are
disabled.
4.4 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 displayed. Press the “REL” button again to
exit the Relative mode.
4.5 MAX/MIN Operation:
Pressing the “MAX/MIN” button places the meter in
the MAX/MIN mode. Under this mode the maximum
value and minimum value is kept in the memory
simultaneously and updated with every new data
reading.
Pressing the MAX/MIN button will display the MAX
indicator and the Maximum value on the display.
Pressing MAX/MIN again will display the MIN
indicator and the Minimum value on the display.
Pressing MAX/MIN again causes the MAX and MIN
indicators to blink together. This means that these

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data have been updated in the memory and the
reading is the present temperature and humidity.
When the meter is in the MAX/MIN mode, the
“REL” and “°C/°F” buttons are disabled. To exit the
MAX/MIN mode, one may press and hold MAX/MIN
for two seconds.
4.6 Auto Power Off:
By default, when the meter is powered on, it is in
the 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 feature,
press and hold the “HOLD” button and then power
on the meter, The auto power off symbol will
disappear to indicate that auto power off is
disabled.
4.7 Low Battery Condition:
When the battery voltage is under proper
operation requirement, the symbol will show
on the LCD and the battery needs to be replaced
with new one.
4.8 Calibration Point:
Room temperature: 23°C ± 5°C
Temperature calibration point: 0°C to 40°C
Humidity calibration point: 32.8% RH@25°C
75.3% RH@25°C
4.9 Calibration Procedure:
We recommend that temperature be calibrated
first, followed by humidity.
4.9.1 Temperature calibration:
1. Turn the meter off.
2. Press the “HOLD” and “°C/°F” keys, then press
“POWER” to turn on the meter. The LCD will
blink. Within 3 seconds press the “°C/°F” button
to enter the temperature calibration mode.
3. When the meter enters the calibration mode,
the meter will show “CAL1” in the LCD window.

Humidity Temperature
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4. Place the probe in a stable 0°C environment
for 10 minutes then press the “MAX/MIN” key
to start the calibration process. Calibration
completion is indicated by a long beep. This
calibration point can be skipped by pressing
the “POWER” key.
5. After “CAL 1” the meter will display “CAL 2” to
calibrate the second calibration point.
6. Place the probe in a stable environment at 40°C
for 10 minutes, then press the “MAX/MIN” key
to start the calibration process. Calibration
completion is indicated by a long beep. This
calibration point can also be skipped by
pressing the “POWER” key.After the calibration
process is completed, the meter will go back to
its normal operating mode.
4.9.2 Humidity Calibration:
1. Turn the meter off.
2. Press and hold both the “HOLD” and “°C/°F”
keys then push on the “POWER” to turn on the
meter. The LCD will blink. Within 3 seconds
press the “REL” button to enter the humidity
calibration mode.
3. When the meter enters the calibration mode,
the meter will show “CAL1” in the LCD window.
4. Put the meter in a stable environment of
32.8%RH@25°C for 30 minutes, then press the
“MAX/MIN” key to start the calibration process.
Calibration completion is indicated by a long
beep. This calibration point can be skipped by
pressing the “POWER” key.
5. After “CAL 1” the meter will display “CAL 2” to
calibrate the second calibration point.
6. Put the meter in a stable environment of
75.3%RH@25°C for 30 minutes, then press the
“MAX/MIN” key to start the calibration process.
Calibration completion is indicated by a long

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beep. This calibration point can also be skipped
by pressing the “POWER” key.After calibration
the meter will go back to normal mode.
4.9.3 Recall factory calibration data:
1. Turn the meter off.
2. Press and hold the “HOLD” and “°C/°F” keys
then turn on the meter. The LCD will blink.
Within 3 seconds press the “MAX/MIN” key to
recall the factory calibration data.
3. After a long beep, the calibration data has been
reset to the factory settings.
Optional Accessories:
33%RH Humidity standard
75%RH Humidity standard