The QBJ-31Z axial displacement monitoring instrument is a precision measurement and control instrument, which is equipped with QBJ-3800XL eddy current displacement sensorsensorUsed for continuous monitoring of the axial position of the main shaft or rotor of rotating machinery during start stop and operation. Axial displacement is the measurement of axial displacement within a machine, relative to the gap between the rotor and the thrust bearing along the axis direction. It can indicate the axial gap between the rotating and fixed components. For rotating machinery such as steam turbines, gas turbines, water turbines, centrifuges, and axial compressors, the position of the bearing is a very important signal. Excessive axial position will cause significant damage to the mechanism, and the axial displacement monitor can provide early warning and protection for the damage of the thrust bearing. Fully digitized, with good stability, high accuracy, simple operation, and convenient and reliable maintenance. The friendly human-machine dialogue interface makes this product at the leading level in China.

Main functions
Monitoring and protection of axial position of rotating machinery such as steam turbines, water turbines, compressors, blowers, etc.

Function Description:

1. Display function
The axial displacement measurement value, alarm, and shutdown setting values can be set separately atLEDseven-segment displayDisplayed above.
2. Alarm function
Alarm, shutdown, and input signal faults are respectively caused byLED lightingPipe indication.
3. Alarm delay time setting function
Adjustment range of alarm delay time0-3 seconds to prevent false alarms caused by on-site interference.
4. Self diagnostic function
Any input system malfunction, such as probe wear, poor wire contact or breakage, can be detected, and the alarm and shutdown output circuits can be cut off.
Equipped with power on and power off detection functions, while disconnecting the alarm output circuit, it can effectively suppress false alarms from the monitoring instrument.
5. Output interface
given4-20mA current output universal interface, can be connected to computers, DCS, PLC systems, paperless recorders and other equipment.

Technical Specifications:

1. Sensor input: QBJ-3800XL eddy current displacement sensor, frequency response: 0-5KHz
2. Display mode: 4-digit 0.8-inch LED digital display, accuracy: ± 0.5%
3. Measurement range: -2.0 to+2.0mm (produced within ± 1.5mm without special requirements)
4. Current output: 4-20mA or 0-10mA, load ≤ 500 Ω
5. Alarm contact capacity: AC220V/3A, DC28V/3A
6. Working environment: Temperature: 0-55 ℃ Relative humidity: ≤ 95%
7. Working power supply: AC 220VAC ± 10% 50Hz power consumption ≤ 10W
8. Installation method: disc type
9. Overall dimensions: 160 (width) x 80 (height) x 250 (depth) mm
10. Hole size: 152 (width) × 75 (height) mm

Ordering Guide:

The QBJ-31Z axial displacement monitor must be equipped with a QBJ-3800XL eddy current sensor.
2. Selection code:
QBJ-31Z—A □□—B□□—C□□—D□□—E□□
8800-X1/X2—A □□—B□□—C□□—D□□—E□□

Range selectionA□□：
0 1—— -0.5～0～+0.5mm
0 2—— -1.0～0～+1.0mm
0 3—— -1.5～0～+1.5mm
0 4—— -2.0～0～+2.0mm

current outputB□□：
0 1—— 4～20mA
0 2—— 0～10mA
Sensor selection:C □□ (QBJ-3800XL Eddy Current Sensor):
0 1- Ø 8mm sensor
0 2- Ø 11mm sensor
0 3- Ø 18mm sensor
alarm delay:D□□：
0 1-0.1 seconds
0 2-1 second
0-3 seconds
Installation directionE□□：
0 1- Increase distance from the probe
0 2- Reduced distance from the probe

TR81/DWQZ/TRIN/7200/3300/PR6422/PR6423/PR6424/PR6425/PR6426/Eddy current displacement sensor

SD081082/85811/TM0180/TM0105/TM0182/WINW/QH8500/SE/CWY-DO/Axial Displacement Sensor

KY8500/OD9000/9000XL/S2200/VB-Z9100/MLW3300/WD220 non-contact displacement sensor

QBJ-31Z/CZQZ/RDZW-2/RDZW-2N/QBJ-31Z/8521C/8531C/85300-DW/Axial Displacement Monitoring and Protection Instrument

85350/85710/EN2000A2/HY-01/TPM/DTPM/OD9006/Docker2/VRS2000A2/Axial Displacement Monitoring Instrument

QBJ-31Z/CZQX/RDCZ/RDCZ-2/85710/HY-02/DEM/DDEM/S2161A/VRS2000A5/Differential Expansion Monitoring and Protection Instrument