Rion PV-91C User manual
圧電式加速度ピックアップ PV-91C
取扱説明書
取り扱い上の注意
重要
CCLD 方式に対応していない電源に接続しないでください。特に定電圧電源に接
続すると、内蔵のチャージアンプが壊れます。
5.9
12.5
約8.1
3.8
φ7
φ6.7
7
10.1
M3 深さ2
概要
特徴
ピックアップと測定器類との接続
加速度ピックアップ用コードの取り扱い
測定対象物への取り付け方法
標準取り付け方法（VP-53K を用いた取り付け）
取り付け手順
絶縁アタッチメント（VP-53W）を用いた取り付け方法
取り付け手順
PV-91C
VP-53K
（付属品） （付属品）
VP-53W
ネジ加工
M3 P=0.5
D=3.5~4 接着面
外形・寸法
PV-91C本体
VP-51LC
粘着テープ
仕様
本社／営業部
東京都国分寺市東元町 3 丁目 20 番 41 号
〠 185-8533 TEL（042）359-7887（代表） FAX（042）359-7458
サービス窓口
リオンサービスセンター株式会社
東京都八王子市兵衛 2 丁目 22 番 2 号
〠 192-0918 TEL（042）632-1122 FAX（042）632-1140
東日本営業所
さいたま市南区南浦和 2-40-2 南浦和ガーデンビルリブレ
〠 336-0017 TEL（048）813-5361 FAX（048）813-5364
西日本営業所
大阪市北区梅田 2 丁目 5 番 5 号 横山ビル 6F
〠 530-0001 TEL（06）6346-3671 FAX（06）6346-3673
東海営業所
名古屋市中区丸の内 2 丁目 3 番 23 号 和波ビル
〠 460-0002 TEL（052）232-0470 FAX（052）232-0458
九州リオン（株）
福岡市博多区店屋町 5-22 朝日生命福岡第 2 ビル
〠 812-0025 TEL（092）281-5366 FAX（092）291-2847
http://www.rion.co.jp/
PV-91C の代表諸特性
周波数特性
-40
-30
-20
-10
0
10
20
30
40
1 10 100 1000 10000 100000
Frequency [Hz]
Relative acceleration level [dB]
：PV-90C1+VP-53K（ねじ止め）
［1〜12000 Hz（±10%）at23℃］
ベース歪み感度
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
0.10
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Base distortion sensitivity [(m/s2)/μstrain]
Time [s]
※取り付け部に連続的かつ定量的歪みを加えた
ときの1μstrainあたりのPV-91C出力
電圧感度の温度特性
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
15.0
20.0
-50 0 50 100 150
Temperature [℃]
Sensitivity temperature coefficient [%]
熱過渡応答
※PV-91Cに温度衝撃を加えたときの1℃あたり
のPV-91C出力
温度衝撃を加えたポイント
-1.00
-0.80
-0.60
-0.40
-0.20
0.00
0.20
0.40
0.60
0.80
1.00
0123456
Thermal transient response [(m/s2)/℃]
Time [s]
仕様項目の説明と注意
電圧感度
周波数範囲
横感度比
ベース歪み
熱過渡応答
PIEZOELECTRIC ACCELEROMETER
PV-91C
INSTRUCTION MANUAL
Outline
The PV-91C is a compact piezoelectric accelerometer featuring an annular shear mode
element and a CCLD (constant current line drive) type charge amplier. The PV-91C
is allowed acceleration measurements in temperature environments up to 170°C.
The PV-91C has one detection axis perpendicular to the mounting surface. Various
mounting methods are supported, including screw mounting (standard method), adhesive
mounting using the supplied insulation attachment VP-53W, dual-sided adhesive tape,
etc. The supplied cable with 10-32 UNF connectors and ferrite cores VP-51LC is to
be connected to the PV-91C. Also the optional low-noise coaxial cable (heat-resistant)
VP-51LB and accelerometer cable VP-51L are used for connection.
Features
• Connects for use with devices such as a data recorder, analyzer and vibration
meter which has CCLD input.
• Performs vibration measurement in the wider temperature range than the tradi-
tional accelerometer of the CCLD system.
• Because of the compact and lightweight design, there is little accelerometer mass
interference with the object being measured and it can be used for a wide variety
of applications such as vibration measurement and modal analysis of lightweight
structural objects.
Precautions
In order to ensure safety, carefully read and observe the precautions below.
Important
Do not connect the PV-91C to a power supply that is not CCLD
compliant. In particular, connecting the PV-91C to a constant
voltage power supply may cause permanent damage to the unit.
• Take care not to drop the PV-91C, to prevent the risk of damage and performance deg-
radation. If the mounting surface is damaged, frequency response may also suffer.
• Use the PV-91C only within its specied operation temperature range. In particular, protect
the unit from excessively high temperatures. Otherwise, the PV-91C may be damaged.
• The PV-91C is not waterproof. Do not immerse the unit in water or expose it to a
high humidity environment for an extended time. Otherwise water may enter the
unit and performance may be degraded due to reduced grounding.
• Be careful there is no adhesion of dust and dirt to the PV-91C. Clean the PV-91C
only by wiping it with a soft, dry cloth or, when necessary, with a cloth lightly
moistened with water.
• Do not insert any objects such as pins, metal scraps etc. into center contact of the
PV-91C.
• Protect the unit from water, dust and extreme humidity during storage. Also keep
the unit away from air with high salt or sulphur content, gases, and stored chemicals
during storage and use.
• When disconnecting cables, always grasp the plug and do not pull the cable. Do
not apply excessive force.
• Do not try to disassemble or alter the unit.
• When the PV-91C is mounted to a measurement object, the mass of the acceler-
ometer will be added to that of the object, thereby changing its vibration mode.
Provided that the mass of the measurement object is at least 10 times of the ac-
celerometer, the change in resonance frequency will be 5 percent or less and can
therefore largely be disregarded. Since the PV-91C has a mass of 1.8 grams, the
measurement object should have a mass of at least 18 grams.
• In case of a malfunction, checks and servicing contact the supplier.
• When disposing of the PV-91C, please follow the local and national government
regulations and laws.
Accelerometer and measurement unit connection
Use the supplied cable with 10-32 UNF connectors and ferrite cores VP-51LC to
connect the PV-91C to the measurement device. If the measurement device has a
BNC connector, the optional BNC adapter VP-52C can be used. When connect-
ing the VP-51LC to the PV-91C, insert the plug straight and make sure that the
center contact of the VP-51LC is engaged with the corresponding center contact
of the PV-91C connector. Then turn the ring to tighten the connection. If the ring
is tightened while the center contact is not properly inserted or positioned at an
angle, the connector may be damaged.
The center connector of the VP-51LC is enclosed by a silicon pad that serves to
ensure a tight t and prevent wobbling when connected to the PV-91C. In rare cases,
when the unit is exposed to temperatures near the limits for extended periods, the
silicon pad may deteriorate and lose its effect. If this has happened, the pad should
be replaced. Contact the supplier.
When handling the parts, take care not to get the PV-91C or VP-51LC dirty. Otherwise,
contact problems may impair the measurement. If a part has become contaminated,
wipe it with cleaning alcohol or similar and use it only after it has full dried.
Accelerometer cable handling precautions
During a vibration measurement, the supplied cable with 10-32 UNF connectors
and ferrite cores VP-51LC may become deformed or break due to the inuence
of vibrations and resonance. To prevent this, the VP-51LC should be xed to the
measurement object with adhesive tape or similar, at a point as close to the PV-91C
as possible. Also, note that stress which tends to occur at the base of the connector
can cause the cable to break if present for an extended time. Handle the cable with
care and avoid subjecting this section to bending force etc.
PV-91C
VP-51LC
Adhesive tape
Method of mounting to an object to be measured
The standard mounting method using the VP-53K
Installation procedure
1. Drill a hole (M3 P=0.5) into the measurement object for attaching the PV-91C
(effective depth 3.5 to 4 mm).
2.
Insert the M3 screw VP-53K into the PV-91C and use the supplied hex wrench to
lightly tighten it (0.1 to 0.4 N
·
m).
3. Attach the PV-91C to the measurement object.
4. Use the supplied spanner to fasten the PV-91C (fastening torque approx. 0.5
N·m).
5. Connect the supplied cable with 10-32 UNF connectors and ferrite cores VP-
51LC to the accelerometer.
It is important that the PV-91C adheres tightly and hermetically to the measure-
ment object. If the surface to which the accelerometer is mounted is not smooth,
frequency response may be affected. Either select a section that is already at
and smooth, or nish the section to a suitable condition prior to mounting. When
opening a screw mounting hole in the measurement object, the tap must be applied
completely vertically, to ensure a tight t of the accelerometer and prevent impair-
ment of frequency response.
Do not use any other screw except the supplied M3 screw. Otherwise the required
strength and tight t may not be achieved.
The mounting method using the insulation attachment VP-53W
If an electric potential exists between the housing (ground) of the PV-91C and
the measurement object, a current may ow in the ground line, which can lead to
unstable operation and noise. In such a case, use the supplied insulation attachment
VP-53W. The attachment can also be used to attach the PV-91C if there should be
no screw hole in the measurement object.
However, when using the VP-53W, the upper temperature limit for use of the PV-
91C is reduced to 160°C. If used in environment higher than 160°C, the insulating
layer of the VP-53W may develop microscopic cracks.
Installation procedure
1. Attach the VP-53W to the PV-91C and use the supplied spanner to fasten it
(fastening torque approx. 0.5 N·m).
2. Make sure that the surface of the measurement object is clean, to ensure a good
adhesive t. Also clean the mounting surface of the VP-53W.
3. Use a suitable adhesive to glue the VP-53W with PV-91C to the measurement
object. For information on the proper procedure for gluing and detaching, refer
to the instructions of the adhesive in use.
4. After the adhesive has fully set, connect the VP-51LC to the accelerometer.
Do not modify or damage the VP-53W. Otherwise proper isolation may not be
achieved.
PV-91C
Gluing surface
(supplied)
Drill screw hole
M3 P = 0.5 mm
D=3.5to4mm
(supplied)
VP-53K VP-53W
http://www.rion.co.jp/english/
3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan
Outside views
5.9
12.5
3.8
7
6.7
7
10.1
M3 depth 2
Approx. 8.1
unit: mm
***** is the serial number.
Typical response of the PV-91C
Frequency response
-40
-30
-20
-10
0
10
20
30
40
1 10 100 1000 10000 100000
Frequency [Hz]
Relative acceleration level [dB]
:PV-91C+VP-53K (Screw)
[1 to 12000 Hz (
±
10%) at 23
°C
]
Base distortion sensitivity
Temperature characteristics of voltage sensitivity
Thermal transient response
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
0.10
0 0.10.20.30.40.50.60.70.80.9 1
Base distortion sensitivity [(m/s2)/ strain]
Time [s]
* PV-91C output per 1 strain when continuous and
quantitative strain is applied to mounting section
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
15.0
20.0
-50 0 50 100 150
Temperature [
°C
]
Sensitivity temperature coefficient [%]
-1.00
-0.80
-0.60
-0.40
-0.20
0.00
0.20
0.40
0.60
0.80
1.00
0123456
Thermal transient response [(m/s2)/°C]
Time [s]
Thermal shock point
* PV-91C output per 1°C when a rapid fluctuation in
ambient temperature is applied to PV-91C
Explanation and notes about specication items
Voltage sensitivity
The reference piezoelectric accelerometer PV-03 absolutely calibrated by ISO 5347
compliant laser interferometry is used for comparative calibration of the PV-91C.
The reference frequency for sensitivity calibration is 80 Hz.
Vibration frequency range
The frequency response of the PV-91C is measured through comparison to a ref-
erence accelerometer such as the PV-03. Frequency response is referenced to 80
Hz. The resonance frequency of the PV-91C is located at approximately 55 kHz.
The lower limit of the PV-91C's vibration frequency range is largely unaffected
by the mounting method.
Transverse response
This is the response of the accelerometer on an axis that is orthogonal to the sensitive
axis. It is largely due to material properties and slight angle shifts during assembly
of the accelerometer. If there is large vibration from a specic direction and vibra-
tions on an axis right angle to it are to be measured, the transverse response must
be taken into consideration.
Base distortion
When the mounting section of a piezoelectric accelerometer is subject to strain, noise
and sensitivity changes may occur. The accelerometer should therefore be mounted
on a sturdy and at surface that is not susceptible to distortion due to strain.
Thermal transient response
This refers to the change in output that occurs when the temperature of the acceler-
ometer cha nges. It is caused by the pyroelectric effect which produces an electrical
charge when temperature uctuates, and by stresses exerted on the piezoelectric
element due to structural thermal expansion. Thermal transient response normally
occurs when the temperature of the vibrating object to which the accelerometer is
mounted changes, but it can also arise due to changes in the ambient temperature.
If the air in the measurement location is subject to temperature changes, the effect
can be reduced by providing a cover or similar for the accelerometer.
Specications
Standard compliance EU RoHS Directive, China RoHS, WEEE Directive
CE mark
(EMC Directive: 2004/108/EC
EN 61326-1: 2006/IEC 61326-1: 2005)
*When combined with supplied VP-51LC
Method Piezoelectric accelerometer detection, annular shear mode
Axis 1 axis (perpendicular to mounting surface)
Voltage sensitivity 1 mV/(m/s2) (at 80 Hz, 23°C)
DC bias voltage 7 V to 15 V DC (all temperature range)
(approx. 12.5 V at 23°C )
Residual noise 20 µVrms (TYP.), 40 µVrms (MAX.) (1 Hz to 20 kHz, 23°C)
Vibration frequency range
1 Hz to 20 kHz (±10%) at -50°C to 150°C
1 Hz to 2 Hz (±15%), 2 Hz to 20 kHz (±10%) at 150°C
to 170°C
Output resistance 100 Ω or less
Maximum measurable acceleration
5000 m/s2(peak)
Differ according to temperature, voltage sensitivity and
supply voltage
Transverse response 5% or less (30 Hz)
Base distortion sensitivity
0.006 (m/s2)/µstrain (TYP.), 0.02 (m/s2)/µstrain (MAX.)
(using 3 Hz high-pass lter)
Thermal transient response
0.04 (m/s2)/°C (TYP.), 0.1 (m/s2)/°C (MAX.)
(using 3 Hz high-pass lter)
Supply voltage 18 V to 30 V DC (constant current 2 to 4 mA)
Rated voltage 24 V
Polarity Acceleration in the direction from the mounting surface to
the accelerometer generates positive output voltage
Grounding Non-insulated
Mounting Screw mounting, M3 screw
Case material Titanium alloy
Connection cable VP-51L, VP-51LB, VP-51LC
Conform to CE marking only when combined with VP-51LC
Operating temperature range
-50°C to +170°C
Storage temperature range
-50°C to +170°C
Waterproong Non-waterproof (unit must be protected from condensation
and corrosive gases during storage and measurement)
Dimensions 7 mm (hex width across ats) × 12.5 mm (H)
(excluding connector)
Mass Approx. 1.8 g
Supplied accessories
Case 1
Cable with 10-32 UNF connectors and ferrite cores VP-51LC 1
M3 screw VP-53K 2
Insulation attachment VP-53W 1
Spanner (for 7 mm) 1
HEX wrench 1
Calibration chart 1
Instruction manual 1
Inspection certicate 1
Optional accessories
BNC adapter VP-52C
Accelerometer cable VP-51L
Low-noise coaxial cable (heat-resistant) VP-51LB
No. 56950 12-03
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