(1) To close the load cell relay, press the LOAD CAL
key on the Series 4400 front panel, then press 0 and
ENTER. The LOAD CAL and LOAD BAL LEDs
are both lit when this relay is closed.
(2) IMPORTANT – After checking pen deflection,
open the calibration relay by repeating the key se-
quence to close the relay: press LOAD CAL, 0,
ENTER on the keypad. The LOAD CAL and
LOAD BAL LEDs go out. A test cannot be
started when the calibration relay is closed.
Note
The voltage generated when the load cell cali-
bration relay is closed is the same as would be
produced by an applied load equal to 50% of
the maximum capacity of the cell when using
LOAD CELL
MAXIMUM
CAPACITY
*CALIBRATION SIGNAL VALUE - SI EQUIVALENT
NEWTONS POUNDS KILOGRAMS
50 N 25 5.62 2.55
500 N 250 56.2 25.49
5 kN 2 500 562 254.9
10 kN 5 000 1 124 509.8
50 kN 25 000 5 620 2 549
150 kN 75 000 16 861 7 648
300 kN 150 000 33 721 15 296
600 kN 300 000 67 443 30 592
*To convert newtons:
1. Multiply by 0.224 808 9
to obtain pounds.
Table 6-3. Calibration Signal for Load Cells
Strip Chart Recorder M10-94400-1
6-10
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