© 2002 Dynalco Controls
p/n 145F-12033, Rev. 0
Installation and Calibration
LMD-120D Signal Powered Digital Indicator
The LMD-120D is powered from the 4–20 or 10–50 mA current that serves as the
signal into terminals F (+) and H (–).
Do not make any other power connections to this unit.
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This device can be connected as a simple current meter in any 4–20 or
10–50 mA current loop in series with transmitters, controllers, and other
4–20 or 10–50 mA monitors. Maximum loop burden is 2 V (100
W
) at 20 mA.
Calibration
1. With 4 mA input, adjust ZERO ADJUST for desired reading at 4 mA.
2. With 20 mA input, adjust SPAN ADJUST for desired reading at 20 mA.
3. Repeat steps 1 and 2. Recalibrate as needed.
®
With 10–50 mA input, jumper terminals A and B.
Follow steps 1 to 3, replacing 4 mA with 10 mA, and 20 mA with 50 mA.
Note
u
With switch settings less than 8, ZERO ADJUST permits any initial reading
from –1000 to +1000; SPAN ADJUST from 100 to 2000 counts.
u
With switch settings at 8 and above, the zero is adjustable from
–10,000 to +10,000; the span is adjustable from 1,000 to 20,000 (fixed zero).
