American Magnetics 175 User Manual
MODEL 175
Two-Wire
Continuous Level
Transmitter
INSTALLATION,
OPERATION &
MAINTENANCE MANUAL
[mn-175, Rev 2]
Feb 2007
American Magnetics, Inc.
112 Flint Road
Oak Ridge, TN 37830
Phone#: (865) 482-1056
Fax#: (865) 482-5472
www.americanmagnetics.com
TABLE OF CONTENTS
SECTION A
Foreword .......................................................................................................................... 3
Safety Precautions........................................................................................................... 3
Warranty .......................................................................................................................... 4
Return Authorization ........................................................................................................ 4
Introduction ......................................................................................................................... 4
System Description .......................................................................................................... 5
Instrument Model Configuration....................................................................................... 5
Model 175 Transmitter Dimensional Drawings ................................................................ 6
Probe (Capacitance Sensor) Model Configuration........................................................... 7
Instrument Specifications ................................................................................................ 8
Probe Specifications ....................................................................................................... 8
Operating Principle .......................................................................................................... 8
Installation .......................................................................................................................... 8
Integral-mounted Transmitters......................................................................................... 9
Remote-mounted Transmitters ........................................................................................ 10
SECTION B
Set-up ................................................................................................................................ 13
ProxCal Calculation ......................................................................................................... 13
Menu Item Descriptions ................................................................................................... 14
Menu Structure ................................................................................................................ 15
Troubleshooting .................................................................................................................. 16
General .......................................................................................................................... 16
Error Display .................................................................................................................... 16
Drift Test .......................................................................................................................... 17
System Loop Test ............................................................................................................ 17
Check Probe .................................................................................................................... 17
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SECTION A
Foreword
This section contains the Installation instructions for the American Magnetics (AMI) Model 175
Two-Wire Continuous Level Transmitter. Since it is impossible to cover all possible
sensor/systems configurations, only the most common are discussed in this document. The
user is encouraged to contact an authorized American Magnetics Customer Support
Representative for specific situations.
Foreword discusses safety precautions and safety notations as well as other generic information
used throughout this manual.
Introduction explains the functions and characteristics of the instrument, describes the model
number configurations for the instrument and the probe, and documents the performance
specifications, as well as, an explanation of the operating principle.
Installation describes the procedure for properly unpacking and installing the transmitter into
your vessel.
Safety Precautions
Conventions
The conventions used in this manual follow ANSI Z535.4-2002 for “Product Safety Signs and
Labels”. The safety markings in this manual are as follows:
WARNING
!
CAUTION
!
Cryogen Safety
Cryogenic liquefied gases are potentially extreme suffocation hazards since a small amount of
liquid will vaporize and yield a very large volume of oxygen-displacing gas. Always ensure the
location where the cryogen used is well ventilated.
Cryogenic liquids, due to their extremely low temperatures, will burn the skin in a similar manner
as hot liquids. Never permit cryogenic liquids to come into contact with the skin or allow them to
soak clothing. Serious burns may result from careless handling. Never touch uninsulated pipes
or vessels containing cryogenic liquids. Flesh will stick to extremely cold materials. Even
nonmetallic materials are dangerous to touch at low temperatures. The vapors expelled during
the venting process are sufficiently cold to burn flesh or freeze optic tissues.
Containers of cryogenic liquids are self-pressurizing (as the liquid boils off, vapor pressure
increases). Hoses or lines used to transfer these liquids should never be sealed at both ends
(i.e. by closing valves at both ends).
The properties of many materials at extremely low temperatures may be quite different from the
properties that these same materials exhibit at room temperatures. Exercise extreme care when
handling materials cooled to cryogenic temperatures until the properties of these materials
under these conditions are known.
WARNING indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury. This category also
includes potential equipment damage.
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Cryogenic storage systems are complex systems with the potential to seriously injure personnel
or equipment if not operated according to procedures. Proper use of safety mechanisms
(pressure relief valves, rupture disks, etc.) included in the cryostat and top plate assembly are
necessary.
Warranty
American Magnetics warranties its products to conform to the specifications described in its
quotation for a period of fifteen months from the date of shipment. AMI makes no other
warranty of any kind, expressed or implied. In the event of failure occurring during normal use,
AMI, at its option, will repair or replace all products or components that fail under warranty and
such repair or replacement shall constitute a fulfillment of all AMI liabilities with respect to its
products. Since, however, AMI does not have control over the installation conditions or the use
to which its products are put, no warranty can be made of fitness for a particular purpose, and
AMI cannot be liable for special or consequential damages. All repairs are F.O.B. Oak Ridge,
Tennessee, USA. If the repairs are covered under this warranty then standard shipping for
return to the customer is paid for by AMI within the USA.
Return Authorization
Before shipping any item to AMI for repair, you must first obtain an RMA number from an
authorized AMI representative. Do not attempt to repair or replace any items without first
speaking to an authorized AMI representative. Doing so may expose the customer to hazards
and will void this warranty. Customers requiring a more comprehensive warranty program may
purchase additional coverage, the price of which may vary by product type.
Introduction
The instructions in this manual pertain to the American Magnetics, Inc. Model 175 Two-Wire
Continuous Level Transmitter. The Model 175 is designed to measure the level of various
liquids, slurries, granular materials, liquid-liquid interfaces, and cryogenic fluids.
The Model 175 is available in two different mounting configurations: integral-mounting with the
probe (see Photo #1), or remote-mounting a maximum of 10 feet from the probe (Photo #2).
Magnet
Tool
Instrument
Housing
Electronic
Assembly
(“Puck”)
Wiring
Nipple
Interconnection
Housing
Probe
Photo #1
Probe
Remote Mounting
Bracket
Photo #2
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System Description
The Model 175 liquid level system consists of the Model 175 Instrument and a CAPSEN
Capacitance Probe. The instrument consists of the electronic assembly (“puck”), a NEMA 4X /
7 explosion-proof enclosure, and an interconnection nipple. The enclosure provides two ¾″
NPT conduit openings for wiring. The windowed cover allows for viewing of process variables.
A magnet tool provides a way to set-up and calibrate the instrument without removing the cover.
The probe is a concentric-tube assembly designed to electrically and physically mate to the
Model 175, either directly or remotely (up to 10-feet). The operating or measurement length is
referred to as the “Active Length” while the “Overall Length” is the tip-to-tip length.
(Shown here with
Cover Removed)
2 Line by 8
character LCD
Contrast
Adjustment
3 Button Keypad
(Can be magnetically
actuated through the
windowed cover with
the Magnet Tool)
Photo #3
Instrument Model Configuration
175 - - 24Vdc - - 4/20mA - S
Mounting
Input Power
Calibration Length
Length Units
Analog Output
Liquid
Standard*
*Custom versions of the Model 175 are not available.
Mounting
Description Code
Integral Integral
Remote Remote
Calibration Length
Calibration length will normally be set at Active Length
of the probe as defined in the probe configuration,
specified in inches (nearest 1/10″) or Centimeters
(integer, no decimal).
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Length Units
Description Code
Inches (nearest 1/10″) in
Centimeters (integer, no decimal) cm
Liquid*
Description Code
Liquid Nitrogen N2
Liquid Oxygen O2
Liquid Hydrogen H2
Liquid Carbon Dioxide CO2
*For others, the commonly recognized chemical formula
(or abbreviation) will be used. Contact factory.
Model 175 Transmitter Dimensions – Inches
Integral-mounted Transmitters
4.54″
¾″ NPT
Remote-mounted Transmitters
4.0″
2.81″
0.332″
2.81″
5.0″
5.1″
8.4″
0.8″
4.5″
3.65″
4.0″
5.1″
7.5″
2.7″
3.55″
3.7″
Mounting Plate
(Back View)
2.88″
Interconnection
Housing
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