Both analogue inputs of the ALMEMO
®
2290-4 are electrically
isolated by using photovoltaic relays and a potential difference
of 50V DC or 60V AC, at maximum, is permissible between
them. However, sensors combined within one connector and
sensors with an own power supply are electrically connected to
each other and must, therefore, be operated in isolation. The
voltage applied to the measuring inputs must not exceed
±5V
(between B,C,D and A or - respectively).
The cold junction compensation for thermocouple measurement is integrated in
socket M0 of the device.
5. DISPLAY AND KEYPAD
5.1 Display
The display (5) of the instrument ALMEMO
®
2290-4 consists of an LCD module
with six and a half 7-segment digits, two 16-segment digits, and a battery
symbol and seven arrows for indicating the operating status.
CORR START MEM COM ALARM F
M
M MIN SEC DIM/F
Measuring Data Display
After switching on, the measured value is indicated with the measuring point M
and the dimension DIM of the previously selected channel.
Meas. point, meas. value and dimension:
0: 2 3.4 ° C
Function Display
The keys F1 and F2, depending on their activation, can be used to select
various function parameters (see 5.2).
Channel, function value, function:
0: 2 9.7 M H
16 ALMEMO
2290-4
Display and Keypad
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