With respect to the BENTLY 991-25-50-02-01 front-end, as detailed information directly specific to this particular
model (991-25-50-02-01) may be scarce and there may be instances where the functionality is similar to similar
models (e.g. 991-25-50-02-00), Therefore, the following answers will be summarized based on the general
characteristics of the Bentley 991 series preprocessor and information about similar models:

I. Product overview

The Bentley 991 Series preprocessor is a high precision, high reliability displacement measurement equipment,
widely used in mechanical equipment such as compressors, pumps, motors or fans vibration monitoring system.
This series of precursors can convert mechanical displacement or vibration into standard 4-20mA current signals
for monitoring, protection and alarm by the control system.

Second, product characteristics

High precision measurement: The Bentley 991 Series front appliance has a high precision measurement capability
that accurately reflects the displacement or vibration of mechanical equipment.

Two-wire power supply: This series of preprocessor adopts two-wire ring power supply mode, simplifies the wiring
and installation process, and improves the reliability and stability of the system.

Compatibility: The Bentley 991 Series preprocessor can be used with the Bentley 3300XL NSV proximity eddy
 current sensor probe and its matching extension cable for a wide range of compatibility and flexibility.

Easy adjustment: The non-interactive zero and range potentiometers under the preprocessor TAB support loop
adjustment for easy field calibration and commissioning.

High reliability: This series of preprocessor is made of high-quality materials and advanced technology, with high
reliability and stability, and can operate stably in harsh industrial environments for a long time.

Iii. Technical specifications (Taking similar models 991-25-50-02-00 as an example)

Measuring range: 25-0-25 mils (or 0.635-0-0.635mm)

Output signal: 4-20mA current signal

Supply voltage: +12 to +35Vdc (transmitter terminal input)

Operating temperature: -35°C to +85°C (Storage temperature: -51°C to +100°C)

Housing material: Sealed design, suitable for harsh environments

Weight: About 0.43kg

4. Precautions

When using Bentley 991 Series precursors, ensure that they are properly wired and installed according to the
 product instructions.

Avoid exposing the preprocessor to high temperatures or immersion in corrosive liquids for long periods of time,
 so as not to affect its performance and life.

Regular maintenance and calibration are performed to ensure the accuracy and reliability of the preprocessor.

5. Application fields

The Bentley 991 series precursors are widely used in vibration monitoring systems for various mechanical
equipment, such as compressors, pumps, motors, fans, etc. By monitoring the displacement or vibration
of the equipment, you can detect and handle the abnormal conditions of the equipment in time, so as to
avoid equipment damage and production accidents.

Please note that since specific information on the 991-25-50-02-01 model may be scarce, the above answers
are based on general features of Bentley 991 series precursors and information on similar models. If necessary,
 please contact Bentley official or relevant supplier directly for more accurate information.

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Price description

Price: The price of the product is displayed, and the specific transaction price may change due to the participation of the product in the activity, and may also change with the purchase quantity or the selected specifications. If the user reaches an agreement with the merchant offline, the settlement price of the offline agreement shall preva