LC1000 INSTRUCTION MANUAL INSTALLATION DETAILS
PAGE 18
2.5 LEAK SENSOR INSTALLATION IN FIBERGLASS TANK ANNULUS
The annular space of fiberglass tanks can be fitted with either a DRY ANNULUS type sensor, model
LS610 (Figure 1-6), or a WET RESERVOIR sensor model RSU800 (Figure 1-8). The wet reservoir is
also referred to as the HYDROSTATIC METHOD. Check the specific design drawings for the job, or
choose the type sensor desired from Figures 1-6 or 1-8. Install LS610 sensor per Figure 2-5 or the
separate document covering the RSU800: Bulletin 134.
Instructions per Figure 2-5, DRY ANNULUS SENSOR:
1. Calculate the sensor cable's MOUNTING LENGTH from tank size data so the sensor rests at tank
bottom; or use the following method.
Determine the cable's MOUNTING LENGTH by
adding the cable measurement M from the table at
the right to the RISER HEIGHT. Mark the cable at
that length. DO NOT CUT THE CABLE.
2. Remove the watertight CORD CONNECTOR
supplied by sliding it off the cable.
3. Thread the CONNECTOR into the top of a 2" by
1/2" reducer bushing or riser pipe cap pre-tapped
for a 1/2" NPT hole. (The use of any standard
monitor cap from 2" to 4" pipe size is recommended.
The cap or reducer bushing IS NOT SUPPLIED with
the sensor and must be provided by the installer. A
2” (SK2) or 4” (SK4) Sensor Cap Kit can be ordered
separately from Pneumercator).
4. At riser top, attach the annular space PULL CORD (this is part of the tank supplier's pre-installed
accessories) to the sensor's PULL HOLE.
5. Pull the free end of the PULL CORD out of the riser while feeding the sensor into the riser and
through the annular space until the sensor is at the bottom centerline of the tank. The MOUNTING
LENGTH MARK should be about 5 INCHES above the open riser. Adjust its position as necessary
and, without disconnecting the PULL CORD, coil its excess inside the riser pipe.
6. Feed the sensor cable through the BOTTOM of the riser cap (or bushing), and through the CORD
CONNECTOR while positioning cap over the riser pipe. Mate riser and cap.
7. Tighten CONNECTOR over the cable to ensure a WATERTIGHT SEAL.
8. Complete the wiring installation in accordance with Section 3.
CABLE MEASUREMENT
FROM END OF SENSOR
Tank Dia. Cable M
4 Feet 81 in.
6 Feet 118 in.
8 Feet 150 in.
10 Feet 194 in.
12 Feet 222 in.
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