1. OVERVIEW
Eddy-current transducer is a kind of non-contacting transducer. It has the advantage of high stability large measurable range high sensitivity and good resolution ratio and so on. So it can be widely used in power petrol-chemical metallurgy industry to measure the dynamic and static displacement for steam turbine hydraulic turbine air blower compressor gear case pump and so on. For example:
Radial and axial displacement
Differential expansion
Shaft eccentricity
Vibration
Phase marker
Rotate speed
2. SYSTEM COMPOSITION
Consists of DWQZ sensor DWQZ extension cable and DWQZ driver.
DWQZ Sensor
Consists of sensor tip stainless steel case coax cable and coax connector. According to the diameter of sensor there are DWQZΦ8mm DWQZΦ11mm and DWQZΦ25mm three types can be used.(Φ8mm Φ11mm Φ25mm) According to the different requirement of mounting there are three types can be used. (forward mount type reverse mount type and unthreaded type). And there are two kinds of cable length (1m and o.5m) can be used.
DWQZ Extension cable
There are SMA self-lock connectors on the two ends of extension cable. On one end, there is a fuel proof sleeve to protect the connector against pollution to improve the reliability. Four types cable length can be used. (4m 4.5m 8m and 8.5m)
DWQZ Driver
Driver is the core part of the transducer system, it consists of oscillator bridge circuit detection circuit amplifier and linearizer. It combines with extension cable and sensor to be the DWQZ Eddy-current transducer. According to the diameter of the sensor tip there are three kinds of driver to be selected(Φ8ｍｍ、Φ11ｍｍ、Φ25ｍｍ). According to the length
２
of the system cable there are two kinds of driver to be selected (5m and 9m).
3. SPECIFICATIONS
Model of transducer（mm）
DWQZΦ8
DWQZΦ11
DWQZΦ25
Diameter of sensor tip（mm）
Φ8
Φ11
Φ27.1
Linear range（mm）
2
4
12.7
Sensitivity（V/mm）±5%
8
4
0.8
Scale factor error
±1%
±1.5%
Midpoint of the linear gap (mm)
1.8
3
9
Midpoint of the linear voltage (v)
-10
-10
-7.08
Calibrated material
No. 45 steel, flat surface
Diameter of shaft more than(mm)
80
Diameter of target more than(mm)
18
30
70
Frequency response（kＨｚ）
0～6.5KHz(-3dB)
0～5KHz(-3dB)
0～800Hz(-3dB)
Power supply（V）
-24Vdc
Current consumption（mA）
12
12
15
Output resistance
10KΩ
Calibrating temperature
25℃
Store
temperature
range
Driver
-35℃－+100℃
Sensor
-40℃－+177℃
Extension cable
-40℃－+177℃
Operating
Temperature
range
Driver
-30℃－+70℃
Sensor
-40℃－+150℃
Extension cable
-40℃－+150℃
System weight (standard)
500g±3%
700g±3%
System temperature drift
±5%
System cable length
5ｍ或9ｍ
Extension cable length
4ｍ、4.5ｍ、8ｍ、8.5ｍ
Sensor cable length
1ｍ、0.5ｍ
Intrinsically safe（need safety barrier S803S ）
ExibⅡBT4
Relative humidity
100％ condensing
■ Sensor material：P-Phenylene sulfide（PPS）
■ Case material：1Cr18Ni9Ti
■ Cable material: Coaxial cable FEP sleeve
■ Connector material: Gold-plated finish
■ Driver material: ADC12
■ Armor material: AISI302SST Stainless steel，FEP sleeve
■ Cable min. curve radius：25.4mm
■ Armor cable min. curve radius:30mm
Ordering Code No.：
8108-02-A□□-B□□-C□□-D□□-E□□
Case length: A□□ (Max. length:99mm, Min. length 20mm)
25* : 25mm
30 : 30mm
Unthreaded length:B□□ (Min. unthreaded length:5mm, Max. unthreaded length less 10mm than the case length)
05*: 5mm
10 : 10mm
Thread size: C□□
01*:M10×1
02 : 3/8-24
Armor: D□□
01*:No
02 :With
Sensor length with cable: E□□
10*:1m
05 :0.5m
D511/7D pressure switch 0840181 /0840281/ 0840381 /0840481
D500/7D explosion-proof pressure controller 0854580/ 0854680/ 0854780
D502/7D explosion-proof pressure controller 0850180/ 0850280
D511/7DZ Dual Contact Pressure Controller 0811112/ 0811212 /0811312
