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628 Series Intrinsically Safe
Hammer Union Transmitters
Technical Manual
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NOSHOK 628 Series
Intrinsically Safe Hammer Union Transmitters
• Before installation, please read the entire manual.
• If you do not observe the appropriate regulations, serious
injuries and/or damage can occur.
• Do not use the transmitter in any other way than described
in these operating instructions, or protection provided by the
equipment may be impaired.
• Repairs done by the customer will void the warranty and
approvals, and may create an explosion hazard.
• DO NOT use these products as stop devices or in any other
application where failure of the product could result in personal
injury.
• Ensure that the transmitter is only operated in accordance with
the provisions as described in the following instructions.
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Table Of Contents
Chapter 1
Product Specications ................................................................. 4
Installation General......................................................................5
Removal, Maintenance and Repair ............................................. 6
Hazardous Location Information..................................................7
Understanding Approval Ratings .............................................. 8-9
Chapter 2
Intrinsically-Safe Installation ...................................................... 10
Control Drawings for I.S. Applications ..................................11-12
Chapter 3
Non-Incendive Installation ......................................................... 13
Installation Drawings for Non-Incendive Applications ..........14-15
Warranty ...................................................................................16
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Chapter 1
Product Specications
Excitation Voltage: 10-28 VDC
Output: 4mA -20mA*
Span: 16 mA *
Connections: +PWR/SIG: +EXCITATION VOLTAGE
-PWR/SIG: - EXCITATION VOLTAGE
(This terminal must also be grounded**. This is
normally accomplished in a non-hazardous area
by grounding the supply return terminal per
control drawings 21076, 21077, 21078, & 21079)
Safe overload: ≥150% rated capacity
Max. overload: ≥300% rated capacity
Shunt Calibration Circuit (optional):
Units with “-cal” connection but no “+cal”:
CONNECT TO NEGATIVE SIDE OF POWER SUPPLY TO
ENGAGE the shunt calibration circuit. Do not engage the
calibration circuit longer than one minute in a hazardous location.
Units with “+cal” & “-cal” connection:
To engage shunt, connect negative side of power supply to “-cal”
and positive side of power supply to “+cal”. For units with a “+cal”
connection, the shunt calibration circuit cannot be used or hooked
up in hazardous locations.
IP rating:
Units are hermetically sealed and have an IP rating of at least
IP54.
* Review calibration sheet for any customer specied variations.
** For ordinary, non-hazardous locations, the requirement for grounding the
“-PWR/SIG” connection can be waived if powered by a class 2 circuit.
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Installation, General
• See Chapter 2 for additional requirements when installing in
hazardous locations.
• Ensure that the transmitter is only used within the safe
overload limit at all times.
• Do not use the transmitter in any other way than described
in these operating instructions, or protection provided by the
equipment may be impaired.
Unpacking:
• Inspect the transmitter for possible damage during
transportation; should there be any damage, inform the
transport company and NOSHOK right away.
• Protection caps removed for inspection should be reinstalled
until just before installation.
• Never insert objects into the pressure port or press against
the sensor to deect in an attempt to simulate a load; this can
cause permanent damage to the diaphragm.
Installation:
• The Safety of any system incorporating this transmitter is the
responsibility of the installer.
• Do not install the pressure transmitter if it has any damage.
(Mark damaged units to prevent them from accidently being
installed).
• Some installations require special and/or expert knowledge
for safe installation. For example, applications such high
pressures, dangerous media, and mounting of heavy loads are
beyond the scope of this manual. Trained and knowledgeable
persons should be consulted during installation.
• A shielded cable is preferred for signal quality. It should be
grounded at one end. Grounded at both ends may introduce
ground loop problems.
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Installation, continued
• Verify that process connections are compatible.
• Verify that wetted parts are compatible with the media.
• Do not use with abrasive media.
• When using o-rings, thread tape or sealants, verify that they
are compatible with the media, temperature range, and
pressure range of the transmitter.
• Only tighten on the wrench ats closest to the pressure port.
• Do not allow media to freeze in pressure port.
Removal, Maintenance and Repair
• Transmitters require no maintenance during use.
• All adjustments and repairs should be performed by NOSHOK.
No disassembly or adjustments are permitted in hazardous
locations.
• Recommended recalibration cycle is one year, under normal
conditions.
• Never attempt to remove the transmitter when it is under load
or pressure.
• Take precaution with regard to remaining media in transmitter.
It may be hazardous, toxic, or ammable.
• Repairs done by the customer will void warranty, approvals,
and may create an explosion hazard.
• Never insert objects into the pressure port or press against
the sensor to deect in an attempt to simulate a load; this can
cause permanent damage to the diaphragm.
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Hazardous Location Installations
• Observe the relevant national regulations (e.g.: IEC 60079-14,
NEC, CEC) and observe the applicable standards and
directives for special applications (e.g. with dangerous media
such as acetylene, ammable gases or liquids and toxic gases
or liquids and with refrigeration plants or compressors).
• If you do not observe the appropriate regulations, serious
injuries and/or damage can occur.
• Observe the ambient ratings on unit label.
• All adjustments and repairs should be performed by NOSHOK.
No disassembly or adjustments are permitted in hazardous
locations.
• Repairs done by the customer will void warranty, approvals,
and may create an explosion hazard.
• Protect the diaphragm against any contact with abrasive
substances, pressure spikes, and do not touch with tools. If
you damage the diaphragm, no intrinsic safety can be
guaranteed.
• Units meet dielectric strength requirements of 60079-11
paragraph 6.3.12.
• Negative terminal, marked “-PWR/SIG”, must be grounded.
• Barriers must comply with the entity parameters noted on the
control drawings.
• Installation not per the appropriate control drawing will
invalidate the safety rating. See product label for applicable
control drawing. For example, “install per 21076”.
• Installation per the control drawing is required but it is not
necessarily sufcient to ensure safety. The system in which
it is installed must still conform to all applicable national and
industrial standards.
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Understanding Approval Ratings
• The relevant codes and standards should be consulted for
precise interpretation of the classications and marking.
The denitions below are only for reference.
• Units are not rated for mines.
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Chapter 2
Intrinsically Safe Installation
Introduction
“Intrinsic safety” insures that a circuit operated under normal and
specied fault conditions is not capable of causing ignition of the
prescribed explosive atmosphere.
Installation
The certication of each testing laboratory is valid when the
transmitter has been installed according the installation drawings
or certicates of conformity included in this section.
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CSA Installation Drawings for Intrinsically Safe Applications
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CSA Installation Drawings for Intrinsically Safe Applications
CiLiPi
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Chapter 3
Non-Incendive Installation
Introduction
“Non-incendive” circuits are designed and constructed so that they
are not capable under normal operating conditions or due to
opening, shorting, or grounding of eld wiring, of causing an
ignition of the prescribed ammable gas or vapor.
Installation
The certication of each testing laboratory is valid when the
transmitter has been installed according the installation drawings
or certicates of conformity included in this section.
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CSA Installation Drawings for Non-Incendive Applications
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WARRANTY INFORMATION
NOSHOK’s Three Year Warranty applies to 628 Series Intrinsically
Safe Hammer Union Transmitters.
NOSHOK guarantees all products
to be free from defects in
material and workmanship, to remain within catalogued accuracy
specications, and to operate within the catalogued performance
specications.
These products must be operated within the catalogued environmental and application parameters. Determination of failure will be made
by NOSHOK, Inc.’s equipment and personnel or a certied test facility
specializing in this type of evaluation. Instrument failures determined to
be caused by over-range, incompatibility with environment or product
media and abuse will not be considered under this warranty. NOSHOK,
Inc. will, at its discretion, repair or replace the working parts of the
damaged gauge without cost to the customer.
Corporate Headquarters
1010 West Bagley Road
Berea, Ohio 44017
Ph: 440.243.0888
Fax: 440.243.3472
E-mail: noshok@noshok.com
Web: www.noshok.com
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628TM-14
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