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What's the Max. depth for ( RM4LG01M ) in case I'm measuring a water tank?

The maximum distance between a RM4L and the probe LA9RM201:
for RM4LG is 100 meter with a maximum cable capacity of 10 nF

RM4LA is depend of the sensitivity scale:

for 0.25 to 5 kohms it's 1000 meter with a maximum cable capacity of 200 nF
for 2.5 to 50 kohms it's 100 meter with a maximum cable capacity of 25 nF
for 25 to 500 kohms it's 20 meter with a maximum cable capacity of 4 nF

Thus, for the the operation at 100m and above the RM4LA relay should be selected and the length of the cable is a function of Sensitivity which inturn is dependent on the conductivity of the liquid for which these relays are used.
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