Ahlborn THERM 2420, Руководство по эксплуатации

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5. Initial commissioning
5. INITIAL COMMISSIONING
1.Connect sensor to socket M (1) see 7.
2. Ensure power supply is connected with 3 AA batteries see 6.1
3. To switch ON press key
ON
(3) see 6.2
4. Save the measured value by pressing key MEM (3) see 9.4
5. Relative measuring to a reference value by pressing key
CLR
(3).
Revert to normal measured value by pressing and holding down key CLR
6. Evaluating a measuring operation
Call up maximum / minimum values by pressing keys MAX / MIN (3).
To delete maximum / minimum value(s) press and hold down
keys
MAX or MIN see 9.3
7. To switch OFF press and hold down key
ON
(3)
see 6.2
6. POWER SUPPLY
6.1 Battery operation and supply voltage monitoring
The power supply for this device is normally provided by 3 AA alkaline batter-
ies. At a current consumption of approx. 10 mA the operating time will be ap-
prox. 250 hours. The current operating voltage is displayed each time the the
device is switched on; this gives you a basis for estimating the remaining oper-
ating time. When the remaining battery capacity drops to approx. 10 percent,
the
LOBAT arrow will appear in the display. If the batteries are completely dis-
charged the device will switch off. To replace old batteries first unscrew the
battery compartment cover (4) on the rear of the device.
6.2 Switching ON / OFF, reinitialization
To switch the device ON briefly press and release the key
ON OFF r
(3) in the
middle of the keypad; to switch the device OFF press and hold down the key
ON OFF
.
If interference (e.g. electrostatic) or a malfunction (e.g. battery failure) causes
the device to behave abnormally, the device can be reinitialized. To activate
RESET press and hold down the key
CLR r
when switching on. This will restore
all settings to the factory default status. The calibration data is stored in the
EEPROM on the instrument itself, on a fail-safe basis.
7. CONNECTING THE TRANSDUCERS
Input socket M on the measuring instrument (1) can be used to connect 7 dif-
ferent thermocouple sensors with a miniature thermal connector. The various
possible types and their measuring ranges are listed in Section 10.1. To con-
nect your own existing sensors you simply need the appropriate miniature ther-
mal connector, ensure that these are correctly polarized.
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