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.
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). 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.