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Ashcroft TC User manual

Installation and Maintenance Instructions
for the TC Tank Level Gauge
© Ashcroft Inc. 2020, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0357, www.ashcroft.com
All sales subject to standard terms and conditions of sale. Tank_Content_Gauge_im_RevA_(I&M008-10279)_07-23-20 1
Table of contents:
1. INTRODUCTION ................................................................. 2
2. APPLICATION ..................................................................... 2
3. TRANSPORTATION, STORAGE & UNPACKING
PRECAUTIONS ................................................................... 2
4. DRAWING............................................................................ 2
5. INSTALLATION.................................................................... 2
6. MAINTENANCE................................................................... 3
7. TROUBLESHOOTING......................................................... 3
1. INTRODUCTION
Pressure measurement is an important aspect of manufacturing.
This manual describes the basic operation of the Ashcroft TC
Tank Level Gauge, Designed specifically for vented tanks, the
following instructions should be followed to ensure effective
operation of the gauge.
[Before Using the Pressure Gauge]
It is highly recommended that this instruction manual will be
thoroughly reviewed to prevent improper instrument handling
and/or implementation. Consult Ashcroft on related topics not
covered within this document.
2. APPLICATION
The TC Tank Level Gauge continuously measures liquid
contents of any shape of storage tank or vessel, while its
integral capillary line facilitates remote mounting/reading of
the indicating dial. This gauge offers internal or external tank
mounted seal housing, and multiple mounting options.
This product was designed with a 160mm analog dial. Dials are
graduated in units to user specifications and are often marked
with radial lines to denote critical tank levels.
The power required to operate the TC Tank Level Gauge is
derived from the pressure exerted by the head of liquid within
the tank (hydrostatic pressure). This pressure is sensed by a
stainless steel diaphragm incorporated into the seal housing;
pressure is then conveyed by capillary line to a capsule that
drives the indicating pointer.
Deflection of the capsule within the indicator actuates a
precision mechanism, which moves the a pointer over a
calibrated scale. The transmitting diaphragm, capillary and
indicator capsule together form a sealed system, which is
thoroughly examined for leaks. No attempt should be made
to disconnect the capillary from the instrument, except for
mounting; this minimizes the risk of leaking and/or malfunction.
3. TRANSPORTATION, STORAGE & UNPACKING
INSTRUCTIONS
3.1 Transportation
Units should be handled with care. Be very careful not to apply
vibration to the pressure gauge during transportation.
Never hit or drop the pressure gauge.
CAUTION
The instrument may incur damage if dropped or impacted.
3.2 STORAGE
Store in a temperature-controlled environment free from
dust, humidity, and vibration.
3.3 UNPACKING
Handle the instrument with great care during unpacking.
Verify the product has not been damaged and that the
instrument fulfils the required specifications.
4. MOUNTING
Typical mounting positions on vented tanks
Before using the pressure gauge
it is highly recommended that this
instruction manual be thoroughly
reviewed to prevent improper
instrument handling and/or
implementation. Consult Ashcroft
on related topics not covered
within this document
INTERNAL
INTERNAL
EXTERNAL
EXTERNAL
Installation and Maintenance Instructions
for the TC Tank Level Gauge
© Ashcroft Inc. 2020, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0357, www.ashcroft.com
All sales subject to standard terms and conditions of sale. Tank_Content_Gauge_im_RevA_(I&M008-10279)_07-23-20 2
5. INSTALLATION
Considerable care should be taken during installation to
prevent damage and ensure proper performance. It is
recommended that the case be mounted in position prior to
commencing installation; this will reduce the risk of damaging
the instrument’s capillary line when it is uncoiled.
Note: If practicable, capillary line should only be disconnected
from the indicator case during installation.
CAUTION
Protect the capillary line’s coupling in the event it needs to be
disconnected during routing and installation. Take care when
uncoiling the capillary line while not using the case or seal
housing as leverage points since this could damage the unit
and render it inoperable.
5.1 NOTES
1. Protect the seal housing against the ingress of foreign
matter such as sharp particles or this may puncture the
diaphragm.
2. Support externally routed capillary line with mounting cleats
at intervals of approximately 8 inches (200 mm).
3. Provide mounting cleats at the beginning and completion of
each bend of the capillary line.
4. Despite having a stainless steel case, it is recommended that
a shield be installed where damage may occur.
5. Capillary line should not be routed with a radius less than 2
inches (5 cm).
CAUTION - DISCONNECTING THE CAPILLARY
Disconnecting the capillary should be avoided unless it is
required for routing through a bulkhead or partition wall.
If necessary, the following steps should be followed:
1. Disconnect capillary line at the seal housing; use two
wrenches (17mm).
2. Mount the gauge at installation.
3. Route capillary line through the wall and fasten with cleats at
suggested intervals.
4. Mount the seal housing at tank installation (internal or
external).
5. Thread capillary line to seal housing; use two wrenches (17 mm).
6. Gently open valve between the tank and the seal housing.
CAUTION
Avoid any pressure at the seal housing when disconnecting the
capillary line; disregarding may lead to damage, or injury.
The instrument case may be installed in any orientation to the
seal housing without affecting the gauge reading.
CAUTION
The following should be confirmed prior to installation:
1. Dial references to required specific gravity.
2. Unit capillary line length.
3. Unit’s original installation point had not changed in relation
to the bottom of the tank.
4. Operating temperature reflects original specification.
5.2 INSTALLING THE SEAL HOUSING (EXTERNAL)
The seal housing is bolted to a flange on the side of the tank
(vessel). Installation is measured from the centerline of the
connection point to the bottom of the tank; this requirement
must exactly match that of the initial specification.
Take precautions to ensure that the machined face of the seal
housing is not fouled by any welds or debris.
The diaphragm in the seal housing detects the hydrostatic head
of the tank contents through holes or mesh. There should be no
restrictions between the flange and tank, so proper flow of tank
contents is guaranteed.If not, holes should be drilled.
CAUTION
TO PREVENT DAMAGE TO THE DIAPHRAGM OR SEAL
HOUSING, MOUNTING HOLES MUST BE DRILLED BEFORE
FITTING THE SEAL HOUSING.
The seal housing may be fitted using an Ashcroft isolating
valve. This enables it to be removed without draining the
tank (vessel). Be sure that the tank is completely empty if
the capillary needs to be reconnected after installing the seal
housing.
5.2 INSTALLING THE SEAL HOUSING (INTERNAL)
The seal housing is mounted horizontally on an internal bracket
with the diaphragm facing downward at a predetermined
height from the bottom of the tank; this measurement must be
specified and not altered from that of the initial order.
The connecting capillary line is protected by flexible stainless
steel armored tubing routed inside of the tank to a bulkhead
flange/fitting on the side or top of the tank. Capillary line should
pass through the bulkhead flange or bulkhead fitting and be
adequately supported using best industry practices. Use a
correctly sized spanner to tighten connections.
CAUTION
NEVER TWIST THE INDICATOR OR SEAL HOUSING TO
TIGHTEN CONNECTIONS.
5.3 INSTALLING THE INDICATING CASE
The indicator must be mounted in compliance with standard
industry practice and is designed with an integral back flange
for wall (surface) mounting.
CAUTION
The gauge must not be subjected to:
• Mechanical shock
• Vibration
• Temperature in excess of the unit’s recommended operating
temperature
Installation and Maintenance Instructions
for the TC Tank Level Gauge
© Ashcroft Inc. 2020, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0357, www.ashcroft.com
All sales subject to standard terms and conditions of sale. Tank_Content_Gauge_im_RevA_(I&M008-10279)_07-23-20 3
6. MAINTENANCE
This product will provide many years of service if properly
installed and maintained. Maintenance operations are limited to
periodical cleaning of the indicator face and ensuring that the
seal housing is kept clear of sludge or congealed liquid.
It is recommended that electrical tracing for warming be
installed with the external type seal housing when employed
for use with viscous liquid. Alternatively, the gauge could be
positioned close to outflow heaters, etc; this will assure the
smooth operation of the seal housing’s diaphragm.
The seal housing must be removed from the tank when cleaned
of congealed fluid or sludge. Unless the instrument is attached
to an isolation valve, it will be necessary to drain (empty) the
tank prior to performing this operation.
Where water is being measured and the tank is exposed to
the elements, normal winter precautions must be observed to
prevent the transmitter being damaged by the formation of ice
around the diaphragm.
CAUTION
MAINTENANCE, VERIFICATION AND/OR RECALIBRATION
MUST BE PERFORMED BY AUTHORIZED PERSONNEL
7. TROUBLSHOOTING
Refer to the accompanying table on page 4 to implement
appropriate solutions. Please contact Ashcroft if an issue
persists.
Installation and Maintenance Instructions
for the TC Tank Level Gauge
© Ashcroft Inc. 2020, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0357, www.ashcroft.com
All sales subject to standard terms and conditions of sale. Tank_Content_Gauge_im_RevA_(I&M008-10279)_07-23-20 4
ISSUES CHECKPOINTS CAUSES SOLUTIONS
The gauge indicates a value above
that which is known to be in the
tank.
1. Verify that tank dimensions,
specific gravity and position of the
seal housing are in accordance
with specifications.
2. Confirm that the seal housing is
not clogged with congealed liquid
or sludge.
3. Confirm tank ventilation has not
been blocked.
4. Check that the pointer doesn’t
touch the dial or glass window.
1. Gauge assembly is mounted to the
incorrect tank.
2. The dimensions, specific gravity or
the position of the seal housing
had been altered/changed.
3. Congealed liquid or sludge on the
inside of the tank..
1. Install the gauge assembly to the
proper tank.
2. Clean the tank ventilation and/or
seal housing.
3. Contact Ashcroft if the above
measures do not remedy the
issue.
The gauge indicates a value below
that which is known to be in the
tank.
1. Verify that tank dimensions,
specific gravity and position of the
seal housing are in accordance
with specifications.
2. Verify that the capillary line has
not been damaged or fractured.
3. Confirm that the seal housing is
not clogged with congealed liquid
or sludge.
4 Confirm that the indicating
pointer registers in accordance to
the tank when empty.
5. Check that the seal housing has
not been fitted near strong flow,
due to liquid movement or pump
suction in the tank.
1. Gauge assembly is mounted to the
incorrect tank.
2. The dimensions, specific gravity
or the position of the seal housing
had been altered/changed.
3. Too much mechanical force had
been exerted on the capillary line.
4. Congealed liquid or sludge on the
inside of the tank.
5. Placement of the seal housing is
not optimal.
1. Install the gauge assembly to the
proper tank.
2. Clean the tank ventilation and/or
seal housing.
3. Reinstall the seal housing to a less
turbulent position on the tank.
4. Replace the capillary line.
5. Contact Ashcroft if the above
measures do not remedy the
issue.
The pointer gradually returns to zero. 1. Confirm that the seal housing is
not clogged with congealed liquid
or sludge.
2. Check that the seal housing has
not been fitted near strong flow,
due to liquid movement or pump
suction in the tank.
1. Congealed liquid or sludge on the
inside of the tank.
2. Placement of the seal housing
installation is not optimal.
1. Clean the tank ventilation and/or
seal housing.
2. Reinstall the seal housing to a less
turbulent position on the tank.
3. Contact Ashcroft if the above
measures do not remedy the
issue.
The pointer shows no movement
with variation in the liquid level.
1. Confirm that the seal housing is
not choked with congealed liquid
or sludge.
2. Check that the seal housing has
not been fitted near strong flow,
due to liquid movement or pump
suction in the tank.
3. Check that the capillary line has
not been damaged or fractured.
1. Congealed liquid or sludge on the
inside of the tank.
2. Placement of the seal housing
installation is not optimal.
3. Too much mechanical force had
been exerted on the capillary line.
1. Clean the tank ventilation and/or
seal housing.
2. Reinstall the seal housing to a less
turbulent position on the tank.
3. Replace the capillary line.
4. Contact Ashcroft if the above
measures do not remedy the
issue.
The pointer starts to make a second
sweep of the scale.
1. Verify that tank dimensions,
specific gravity and position of the
seal housing are in accordance
with specifications.
2. Confirm tank ventilation has not
been blocked.
1. The dimensions, specific gravity
or the position of the seal housing
had been altered/changed.
2. Congealed liquid or sludge on the
inside of the tank.
1. Clean the tank ventilation and/or
seal housing.
2. Contact Ashcroft if the above
measure do not remedy the issue.
Indication is erratic, unstable and
varies with temperature.
1. Confirm that the seal housing is
not clogged with congealed liquid
or sludge.
1. Congealed liquid or sludge on the
inside of the tank.
1. Clean the tank ventilation and/or
seal housing.
2. Contact Ashcroft if the above
measures do not remedy the
issue.

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