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991 Thrust Transmitter

Thrust Transmitter

The 991 Thrust Transmitter provides a 4-20 mA signal proportional to thrust position and is designed for use on smaller, non-critical machinery. Its primary use is on centrifugal air compressors with fluid-film thrust bearings. The 991 Thrust Transmitter can measure up to 1.2 mm or 50 mils of total thrust movement.

 

 

 

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Specifications

Unless otherwise noted, the following specifications apply at +22 °C (+72 °F) using a 3300 NSv Probe and Extension Cable, and an AISI 4140 steel target.

Electrical

Input Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable.
Power Requires +12 to +35 Vdc input at the transmitter terminal.
4 to 20 mA Signal Output 4 to 20 mAdc over specified full-scale range in 2-wire configuration.
4 to 20 mA Loop Accuracy Within ±1.5% over specified full scale range (typical). Accuracy is rated from the TEST signal input to the voltage measured across a 250Ω loop resistance.
Maximum Loop Resistance 1,000Ω including cable at 35 Vdc.
Current Limiting 23 mA typical.
Zero and Span Non-interacting external adjustments.
Not OK/Signal Defeat Signal output will go to less than 3.6 mA within 100 μs after a Not OK condition occurs. Signal output is restored within 0.1 seconds after the Not OK condition is removed.
Proximitor Sensor Output Compatible with ungrounded, portable test equipment. When using grounded, ac-powered test equipment, use the 122115-01 Test Adapter for signal isolation.
Output Impedance Prox Out has a 10 kΩ output impedance calibrated for a 10 MΩ load.
Linear Range 0.25 to 1.65 mm (10 to 65 mils) for Prox Out. Suitable for 0.6-0-0.6 mm or 25-0-25 mils current loop linear ranges.
Prox Out Incremental Scale Factor 7.87 mV/μm (200 mV/mil) ± 6.5% typical including interchangeability errors when measured in increments of 0.25 mm (10 mils) over the linear range using a flat 30 mm (1.2 inch) target.
Temperature Stability Incremental scale factor remains within ±10% of 7.87 mV/μm (200 mV/mil) from 0 °C to +70 °C (+32 °F to +158 °F).
Minimum target size 9.5 mm (0.375 in) diameter.
Leadwire Length Proximitor* Sensor Output (BNC connector), maximum cable distance is 3 metres (10 feet).
Non-Hazardous, Zone 2 or Div 2 Hazardous area locations 13 km (8 miles) maximum between transmitter and receiving device for signal output.
Intrinsically Safe Hazardous area locations 68 metres (225 ft.) maximum between transmitter and receiving device for signal output.
Electrical Classification General Purpose Approval by Canadian Standards Association (CSA/NRTL/C) in North America and by VDE in Europe. The 991 has the CE mark for Europe.

Environmental Limits

Transmitter Temperature
Operating Temperature -35 °C to +85 °C (-31 °F to +185 °F)
Storage Temperature -51 °C to +100 °C (-60 °F to +212 °F).
Probe Temperature
Operating Temperature -35 °C to +177 °C (-31 °F to +350 °F).
Storage Temperature -51 °C to +177 °C (-60 °F to +350 °F).
Relative Humidity 100% condensing, non-submerged, with protection of coaxial connectors.

Mechanical

Transducer Tip Material Polyphenylene sulfide (PPS).
Transducer Case Material AISI 303 or 304 Stainless Steel (SST).
Probe Cable 75Ω coaxial, fluoroethylene propylene (FEP) insulated.
Cable Armor (optional) Flexible AISI 302 SST with optional FEP outer jacket.
Tensile Strength 222 N (50 lbf) probe case to probe lead, maximum.
Transmitter Weight 0.43 kg (0.9 lbm).
Total System Weight 0.82 kg (1.8 lbm) typical.

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Descriptions English
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