NoShok 628 Operating Manual
628 Series Intrinsically Safe
Hammer Union Transmitters
Technical Manual
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.
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
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.
4
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.
5
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