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Transducers
Description
The Type 1000 Transducer is an electro-pneumatic
device that reduces a supply pressure to a
regulated output pressure directly proportional
to an electrical input signal. The Type 1000
accepts a wide range of supply pressures,
ranging from a minimum of 3 psig (0.2 BAR)
above the maximum output up to 100 PSIG (6.9
BAR). An integral pneumatic volume booster
is included in the design to provide high flow
capacity (up to 12 SCFM/339 SLPM). Model
selections include general purpose, NEMA 4X
Type, extended range, high relief, intrinsically
safe, and explosion proof.
Applications
The Type 1000 Transducer converts an electrical
signal to a pneumatic output which can be
used to operate the following:
• Valve actuators
• Damper and louver actuators
• Valve positioners
• Controllers
• Relays
• Air
cylinders
• Clutches and brakes
Used in:
• Liquid, gas and slurry processing instrumentation
• HVAC systems
• Paper handling controls
• Textile processing systems
• Energy management systems
• Petrochemical processing systems
Standard Features
• Low Cost
• Built-in Volume Booster
• Small Size
• Field Reversible
• Low Air Consumption
• Mounts at Any Angle
• Convenient External Span & Zero Adjusts
(Except for Explosion Proof Models)
• Light Weight
• Wide Supply Pressure Range
• Low Supply Pressure Sensitivity
Type 1000
I/P & E/P Transducers
Principle of Operation
The Type 1000 Transducer is a force balance
device in which a coil is suspended in the
field of a magnet by a flexure. Current flowing
through the coil generates axial movement of
the coil and flexure. The flexure moves against
the end of a nozzle, and creates a back pressure
in the nozzle by restricting air flow through it.
This back pressure acts as a pilot pressure to
an integral booster relay. Consequently, as the
input signal increases (or decreases, for reverse
acting), output pressure increases proportionally.
Zero and span are calibrated by turning easily
accessible adjusting screws on the front face
of the unit. The zero adjusting screw causes the
nozzle to move relative to the flexure. The span
adjusting screw is a potentiometer that limits
the current through the coil. A thermistor circuit
in series with the coil provides temperature
compensation.
Split Ranging
The 4-20 mA input, 3-15 PSIG output model can
be recalibrated to provide 3-9 PSIG or 9-15 PSIG
output, for split ranging applications.
Mounting
The Type 1000 transducers can be pipe, panel,
or bracket mounted in any position. Positions
other than vertical will require recalibration
of the zero adjustment. For maximum output
pressure stability, the Type 1000 should be
mounted in a vibration-free location or such that
vibration is isolated to the X and Z axis shown
on the dimensional drawings.
Field Reversible
All Type 1000 transducers are calibrated at the
factory for direct acting operation but may be
used in the reverse acting mode by reversing
the polarity of the signal leads and recalibrating.
When calibrated for reverse acting applications,
the Type 1000 transducers provide a
minimum of their full rated output pressure (i.e.,
15, 27, or 30 PSIG) upon input signal failure.
Type 1000 for Extended Range
Description
The Bellofram Extended Range I/P and E/P
Transducers are based on Bellofram’s proven
Type 1000 transducer line - the best selling
transducers in the business.
The large span adjustment range of this line
allows recalibration to fit applications with
output ranges from approximately 3-35 PSIG
(0.2-2.4 BAR) to 3-145 PSIG (0.2-10 BAR).
Type 1000
Transducers
The units accept supply pressures up to 150
PSIG (10.5 BAR) and provide flow capacity to
24 SCFM (677 SLPM).
The Type 1000 I/P and E/P Transducers are
more cost effective and more accurate than
typical high output systems using transducers
coupled to boosting or multiplying relays.
Type 1000 with High Relief
Description
Expanding upon the proven accuracy, reliability,
and rugged construction of the Type 1000
General Purpose, these transducers provide
extra fast “blowdown” for a very rapid release
of downstream pressure. The extra relief feature
makes these units suitable for
cylinder return
stroke actuation, air hoists, and similar applications
requiring fast exhaust. These units accept
supply pressures to 100 PSIG (6.9 BAR), with
output ranges from 1-17 PSIG (0.07-1.2 BAR) to
6-30 PSIG (0.4-2.1 BAR), and provide exhaust
capacities of 7 SCFM (336 SLPM).
