1. Overview

AN3520 series shaft position monitoring receives signals from a Proximity sensor (shaft vibration); the original signals from the sensor are converted into digital signals by a signal interface unit; the digital signals are transmitted to an embedded microcontroller unit (MCU), and are then identified, judged, processed and compared by software and output by output units, thus implementing online monitoring and protection of device shaft position.

2. Purposes

Online monitoring and protection of rotary machine shaft position; 

Online monitoring and protection of rotary machine expansion difference;

3. Functions

Highlight digital display unit: To display real-time vibration value;

Plate-type touch keyboard: Field programming parameter setting;

Standard signal output: 4-20mA;

On-off output: two-stage alert normally open/closed contact output;

LED indicator: To display various statuses;

Buffer interface: Sensor original signal buffer output.

4. Features

Perfect self-inspection and diagnosis function; when a failure occurs, current output is 0mA, and "Not Ok" LED on the panel is on;

Embedded microcontroller unit (MCU); an E2PROM data storage unit (for important parameters) and a FLASH process program storage unit are integrated in the chip;

Power unit: a DC-DC/AC-DC module power supply realizes ultra-width power input and isolated output;

A key quickly sets the direction of the sensor(Stay away from the positive direction Or close to positive direction)

Intelligent fast initial zero setting, easy to debug

Digital quick debugging

5. Application

Application Fields:

Power plants (thermal, hydro, nuclear and wind)

Metallurgy (steel mills and aluminium manufacturers, etc.)

Petrochemical engineering (refining and chemical, coal chemical industry and chemical fertilizers, etc.)



Mine (coal and iron mines)

Hydraulic engineering (reservoirs and pump stations), etc.

Monitored equipment:

Steam turbines;


Water pumps;

Air blowers;

Rotary machines like Water turbines.

6. Technical Specifications


Proximity sensor: 

Proximity probe: Φ8 /Φ11 /Φ25 /Φ50 probe

Shaft position:

2mm: 7.87mV/μm (200mV/mil)

4mm: 3.94 mV/μm (100mV/mil)

25mm: 0.394 mV/μm (10mV/mil)

Expansion difference:

12mm: 0.787mV/μm (20mV/mil)

25mm: 0.394 mV/μm (10mV/mil)

Output voltage: -2 ~ -18VDC;

GAP voltage: -10VDC.

Range of measurement:

Shaft position: 2.00/4.00mm; Resolution: 0.01mm;

Precision: 0.5%±0.01mm.

Expansion difference: 12.00/25.00mm; Resolution: 0.01mm;

Precision: 0.5%±0.01mm.

Power supply:

DC supply: 24VDC (18-36V);

AC supply: 220VAC (185-260V)/47-63Hz;

AC supply: 110VAC/47-63Hz;

Overall power consumption: ≤5W.

Standard signal output: Standard current

Active 4-20mA (corresponding to upper range)

Drive load: ≤750Ω

Effective transmission distance: ≤ 300m (1,000 feet).

Relay output:

Two-stage threshold (Alert, Danger) programmable setting, normally open/closed dry contact output, configurable whole range, with an error ≤0.1%;

Insulation resistance: ≥1000MΩ;

Contact capacity: 2A/30VDC, double-pole double-throw (DPDT);

Alarm-delay: 0.1-60S, default: 0.5S;

Alert lock: Defaulting to non-locking.

Physical property:

Boundary dimension: 160(W)×80(H)×120(D)mm  6.3(W)×3.15(H)×4.7(D)in

Weight: 1kg.

Way of installation:

Open hole installation:

Hole size: 152 (W) ×76 (H) mm,  6.0(W)×3.0(H)in

Environmental restrictions:

Operating temperature: -30℃ ~ +65℃ (-22oF ~ +150 oF);

Storage temperature: -40℃ ~ +85℃ (-40oF ~ +180 oF);

Relative humidity: 0 ~ 95% (non-condensing).

Executive standards

The United States Petroleum Association Standard: API 670

Safety certificate: CE;

Protection level: IP56;

Anti-electromagnetic interference: EMC/LVD

Refer to EN55011\ EN 61010\ EN50081\EN50082.

7. Ordering information

AN3561/62- Shaft position/ Expansion difference



Standard Configuration Model:

Shaft position: 

AN3561-00-00-00-00-00-02 (assorted with AN1808 sensor)

AN3561-01-01-00-00-00-02 (assorted with AN1811 sensor)

AN3561-03-03-00-00-00-02 (assorted with AN1850 sensor)

Expansion difference:

AN3562-02-02-02-00-00-02 (assorted with AN1825 Proximity Sensor)

A: Measuring range

00—2.00m(φ5/φ8 probe) 

01-- 4.00m(φ11 probe)

02-- 12.00m(φ25 probe)

03-- 25.00m(φ50 probe)


B: Sensor type:

00-- AN1808 Proximity sensor(φ8 probe)

01--AN1811 Proximity sensor(φ11 probe)

02-- AN1825 Proximity sensor(φ25 probe)

03-- AN1850 Proximity sensor(φ50 probe)


C: Relay output (DPDT):

00--Double relay dry contact output (high - low - Alert and high high - low low- Danger)

01--Single relay dry contact output (high - low - Alert or high high - low low- Danger)

02-- Double relay dry contact output (high - Alert and high high - Danger)

03--No relay output

D: Standard signal output:

00--4 ~ 20mA standard current output

00--1 ~ 5V standard voltage output

02--RS 485 communication interface output


E: Power supply

00--24VDC (18 ~ 36V)




F: Way of installation

00-- DIN-rail mount: DIN35mm

01-- Panel mount

02-- Open hole installation

Note: Please note if you select other options, If you have any questions, please consult the technical department.



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