American Magnetics 135 & 136 Liquid Helium Level Instruments (CE-Marked) - Manual (Page 23)

Rev. 3 11
Installation
Sensor Preparation
where R is the maximum allowable resistance (in ohms) for each lead wire
from the instrument to the sensor, and L is the active length of the
connected helium level sensor in inches. Please note that the maximum
allowable active sensor length for input line voltages less than 105 VAC or
210 VAC is 64 inches. Tables for active sensor length vs. lead wire distance
are provided below.
Minimum recommended gauge for stranded, tinned-copper lead wire
for input line voltages greater than or equal to 105 VAC or 210 VAC.
Distance
R=367 R=315 R=263 R=211 R=107 R=3.2
L=10” L=20” L=30” L=40” L=60” L=80”
10 ft.
36 AWG 36 AWG 36 AWG 36 AWG
36 AWG
34 AWG
20 ft.
30 AWG
30 ft.
40 ft. 28 AWG
50 ft. 27 AWG
100 ft. 24 AWG
200 ft. 22 AWG
500 ft. 32 AWG 16 AWG
Minimum recommended gauge for stranded, tinned-copper lead wire
for input line voltages less than 105 VAC or 210 VAC.
Distance
R=284 R=232 R=180 R=128 R=24
L=10” L=20” L=30” L=40” L=60”
10 ft.
36 AWG 36 AWG
36 AWG 36 AWG
36 AWG
20 ft.
30 ft.
40 ft.
50 ft.
100 ft. 34 AWG
200 ft. 30 AWG
500 ft. 34 AWG 34 AWG 26 AWG