2500 Automatic Tank Gauge
46 Installation and Operations Manual
Figure 1: Typical In-Service-Tank Installation with Manhole, Inspection Hatch, and Independent
Pipe Support Structure. Detail “A” shows in-service bottom anchor.
Negator Cassette Installation
Varec's negator cassette is a fully enclosed design to safely contain a damaged or failed negator
motor. It will extend negator motor life by keeping pipe scale and debris off the negator motor.
The cassette provides quick and easy change out of any future negator motor failures.
Caution Damage to equipment may result if this precaution is disregarded.
Warning Direct injury to personnel or damage to equipment which can cause injury to
personnel may result if this precaution is not followed.
Disassembly
Perform the following steps to prepare the gauge head for installation of the negator motor
cassette. For part number reference, refer to Figure 11 on page 77.
1. Note and record gauge-level reading.
Float guide
cables
Guided float
36.00 [914] Maximum
16.00 [406] Minimum
Existing standard roof manhole
with gasket & mounting hardware
Pipe support
brackets for
welding to
customer support
structure.
Space brackets
approximately at
10 foot [3 meter]
intervals.
17.00
[432]
In service anchor weight
ordered separately
9 [229]
Space
approximate
Piping and fittings
furnished by customer
Inspection Cover
For existng 20-inch and larger
manhole covers
See details B & C
.25
[6]
Typical
Support structure
set in concrete
Float guide
cable
Anchor weight
Cable clamps
Hex head
cap screw
DETAIL: A
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