Initial Commissioning; Power Supply; Battery Operation And Supply Voltage Monitoring; Switching On / Off, Reinitialization - Ahlborn THERM 2420 Operating Instructions Manual

5. Initial commissioning

5. INITIAL COMMISSIONING
sensor to socket M (1) see 7.
1.Connect
2. Ensure power supply is connected with 3 AA batteries see 6.1
3. To switch ON press key
4. Save the measured value by pressing key
5. Relative measuring to a reference value by pressing key
Revert to normal measured value by pressing and holding down key
6. Evaluating a measuring operation
Call up maximum / minimum values by pressing keys
To delete maximum / minimum value(s) press and hold down
MAX
keys or
7. To switch OFF press and hold down key

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
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
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.
6 THERM 2420
ON
(3) see 6.2
MIN see 9.3
MEM (3) see 9.4
ON (3) see 6.2
CLR r
when switching on. This will restore
CLR (3).
CLR
MAX MIN
/ (3).
(3) in the
ON OFFr