Bellofram Type 1000 I/P High Relief Tranducer
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
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 & brakes
Used In:
• Liquid, gas and slurry processing instrumentation
• HVAC systems
• Paper handling controls
• Textile processing systems
• Energy management systems
• Petrochemical processing systems
The Type 1000 Transducer is an electropneumatic 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 4 Type Option, Extended Range,
High Relief, Intrinsically Safe and Explosion Proof. 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 vibrationfree 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.
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).
Specifications:
