High Accuracy Eddy Current Type Displacement Sensor GP-A (Discontinued Products)
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Discontinued Products
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Specifications
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Dimensions
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Circuit/ Wiring
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Sensing characteristics
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Cautions For Use
Ⅾiscontinued
Last time buy
September 30, 2018
We are sorry, the products have been discontinued. Please refer to the details of the discontinued products and the recommended substitutes list below.
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Discontinued Products

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Specifications
Type | For 1 mm 0.039 in sensing | For 2 mm 0.079 in sensing | |||||
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Non-threaded type sensor head | Non-threaded type sensor head | Threaded type sensor head | |||||
Different frequency | Different frequency | Different frequency | |||||
Set model No. | GP-A5S | GP-A5SI | GP-A8S | GP-A8SI | GP-A10M | GP-A10MI | |
Sensing range | 0 to 1 mm 0 to 0.039 in | 0 to 2 mm 0 to 0.079 in | |||||
Standard sensing object | Iron sheet 8 x 8 x t 1 mm 0.315 x 0.315 x t 0.039 in | Iron sheet 12 x 12 x t 1 mm 0.472 x 0.472 x t 0.039 in | |||||
Supply voltage | 24 V DC ± 10 % Ripple P-P 10 % or less | ||||||
Current consumption | 150 mA or less | ||||||
Analog outputs (Analog voltage output Analog current output) | Analog voltage ・Output voltage: 0 to 5 V ・Output impedance: 100 Ω approx. Analog current ・Output current: 4 to 20 mA ・Load resistance: 0 to 350 Ω | ||||||
Response frequency | 1.6 kHz (-3 dB) | ||||||
Resolution | 0.04 % F.S. | ||||||
Linearity | Within ±0.5 % F.S. | ||||||
Alarm output | NPN open-collector transistor ・Maximum sink current: 100 mA ・Applied voltage: 30 V DC or less (between alarm output and 0 V) ・Residual voltage: 1.6 V or less (at 100 mA sink current) 0.4 V or less (at 16 mA sink current) | ||||||
Output operation | Turns ON when the sensor head connection is improper or the sensor head cable is disconnected | ||||||
Short-circuit protection | - | ||||||
External zero-adjustment input | Input condition: Non-voltage contact or NPN open-collector transistor input Signal condition: Low ... 0 to 1 V (duration 30 ms or more) High ... 5 to 30 V, or open Operation: Low ... External zero-adjustment setting High ... External zero-adjustment ineffective | ||||||
Zero-adjustment setting method | Push button setting / External input setting | ||||||
Power indicator | Green LED (lights up when the power is ON) | ||||||
Over indicator | Orange LED (lights up when sensing range is exceeded) | ||||||
Alarm indicator | Yellow LED (lights up when the alarm output is ON) | ||||||
Adjustments | (1) Shift adjustment (by push-buttons), (2) Span adjustment (by 14-turn adjuster) | ||||||
Temperature characteristics (Note 2) | Sensor head | 0.5 μm/℃ 0.020 mil/℃ | 0.6 μm/℃ 0.024 mil/℃ | 1 μm/℃ 0.039 mil/℃ | 0.6 μm/℃ 0.024 mil/℃ | 1 μm/℃ 0.039 mil/℃ | |
Amplifier | 0.4 μm/℃ 0.016 mil/℃ | 0.8 μm/℃ 0.031 mil/℃ | |||||
Protection | Sensor head | IP67 (IEC), IP67G | |||||
Amplifier | - | ||||||
Ambient temperature | Sensor head | -10 to +55 ℃ +14 to +131 ℉, Storage: -20 to +70 ℃ -4 to +158 ℉ | |||||
Amplifier | 0 to +50 ℃ +32 to +122 ℉ (No dew condensation allowed), Storage: 0 to +50 ℃ +32 to +122 ℉ | ||||||
Ambient humidity | 35 to 85 % RH, Storage: 35 to 85 % RH | ||||||
Voltage withstandability | Sensor head | 250 V AC for one min. between all supply terminals connected together and enclosure | |||||
Insulation resistance | Sensor head | 20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure | |||||
Vibration resistance | Sensor head | 10 to 55 Hz frequency, 1.5 mm 0.059 in double amplitude in X, Y and Z directions for two hours each | |||||
Amplifier | 10 to 150 Hz frequency, 0.75 mm 0.030 in double amplitude in X, Y and Z directions for two hours each | ||||||
Shock resistance | Sensor head | 500 m/s2 acceleration (50 G approx.) in X, Y and Z directions five times each | |||||
Amplifier | 100 m/s2 acceleration (10 G approx.) in X, Y and Z directions five times each | ||||||
Material | Sensor head | Enclosure: Stainless steel (SUS303) Sensing part: Polyalylate | Enclosure: Stainless steel (SUS303) Sensing part: ABS | ||||
Amplifier | Enclosure: ABS | ||||||
Cable | Sensor head | Connector attached high frequency coaxial cable, 3 m 9.843 ft long | |||||
Cable length (Note 3) | Amplifier | Total length up to 100 m 328.084 ft is possible with 0.3 mm2, or more, cable. | |||||
Net Weight | Sensor head | 40 g approx. | 50 g approx. (Note 4) | ||||
Amplifier | 170 g approx. | ||||||
Accessories | Adjusting screwdriver: 1 pc. | Nut: 2 pcs., Toothed lock washer: 1 pc. Adjusting screwdriver: 1 pc. |
Type | For 5 mm 0.197 in sensing | For 3 mm 0.118 in sensing | |||
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Threaded type sensor head | Front sensing type sensor head | ||||
Different frequency | Different frequency | ||||
Set model No. | GP-A12ML | GP-A12MLI | GP-A14F | GP-A14FI | |
Sensing range | 0 to 5 mm 0 to 0.197 in | 0 to 3 mm 0 to 0.118 in | |||
Standard sensing object | Iron sheet 30 x 30 x t 1 mm 1.181 x 1.181 x t 0.039 in | Iron sheet 15 x 15 x t 1 mm 0.591 x 0.591 x t 0.039 in | |||
Supply voltage | 24 V DC ± 10 % Ripple P-P 10 % or less | ||||
Current consumption | 150 mA or less | ||||
Analog output (Analog voltage output Analog current output) | Analog voltage ・Output voltage: 0 to 5 V ・Output impedance: 100 Ω approx. Analog current ・Output current: 4 to 20 mA ・Load resistance: 0 to 350 Ω | ||||
Response frequency | 1.6 kHz (-3 dB) | ||||
Resolution | 0.04 % F.S. | ||||
Linearity | Within ±0.5 % F.S. | ||||
Alarm output | NPN open-collector transistor ・Maximum sink current: 100 mA ・Applied voltage: 30 V DC or less (between alarm output and 0 V) ・Residual voltage: 1.6 V or less (at 100 mA sink current) 0.4 V or less (at 16 mA sink current) | ||||
Output operation | Turns ON when the sensor head connection is improper or the sensor head cable is disconnected | ||||
Short-circuit protection | - | ||||
External zero-adjustment input | Input condition: Non-voltage contact or NPN open-collector transistor input Signal condition: Low ... 0 to 1 V (duration 30 ms or more) High ... 5 to 30 V, or open Operation: Low ... External zero-adjustment setting High ... External zero-adjustment ineffective | ||||
Zero-adjustment setting method | Push button setting / External input setting | ||||
Power indicator | Green LED (lights up when the power is ON) | ||||
Over indicator | Orange LED (lights up when sensing range is exceeded) | ||||
Alarm indicator | Yellow LED (lights up when the alarm output is ON) | ||||
Adjustments | (1) Shift adjustment (by push-buttons), (2) Span adjustment (by 14-turn adjuster) | ||||
Temperature characteristics (Note 2) | Sensor head | 1.5 μm/℃ 0.059 mil/℃ | 2.5 μm/℃ 0.098 mil/℃ | 0.9 μm/℃ 0.035 mil/℃ | 1.5 μm/℃ 0.059 mil/℃ |
Amplifier | 2.0 μm/℃ 0.079 mil/℃ | 1.2 μm/℃ 0.047 mil/℃ | |||
Protection | Sensor head | IP67 (IEC), IP67G | |||
Amplifier | - | ||||
Ambient temperature | Sensor head | -10 to +55 ℃ +14 to +131 ℉, Storage: -20 to +70 ℃ -4 to +158 ℉ | |||
Amplifier | 0 to +50 ℃ +32 to +122 ℉ (No dew condensation), Storage: 0 to +50 ℃ +32 to +122 ℉ | ||||
Ambient humidity | 35 to 85 % RH, Storage: 35 to 85 % RH | ||||
Voltage withstandability | Sensor head | 250 V AC for one min. between all supply terminals connected together and enclosure | |||
Insulation resistance | Sensor head | 20 MΩ, or more, with 250 V DC megger between all supply terminals connected together and enclosure | |||
Vibration resistance | Sensor head | 10 to 55 Hz frequency, 1.5 mm 0.059 in amplitude in X, Y and Z directions for two hours each | |||
Amplifier | 10 to 150 Hz frequency, 0.75 mm 0.030 in amplitude in X, Y and Z directions for two hours each | ||||
Shock resistance | Sensor head | 500 m/s2 acceleration (50 G approx.) in X, Y and Z directions for five times each | |||
Amplifier | 100 m/s2 acceleration (10 G approx.) in X, Y and Z directions for five times each | ||||
Material | Sensor head | Enclosure: Brass (Nickel plated) Sensing part: Nylon | Enclosure: Stainless steel (SUS303) Sensing part: ABS | ||
Amplifier | Enclosure: ABS | ||||
Cable | Sensor head | Connector attached high frequency coaxial cable, 3 m 9.843 ft long | |||
Cable length (Note 3) | Amplifier | Total length up to 100 m 328.084 ft is possible with 0.3 mm2, or more, cable. | |||
Net Weight | Sensor head | 45 g approx. (Note 4) | 50 g approx. | ||
Amplifier | 170 g approx. | ||||
Accessories | Nut: 2 pcs., Toothed lock washer: 1 pc. Adjusting screwdriver: 1 pc. | 2 pcs. each of M3 countersunk head screws, spring washers, plain washers and M3 nuts Adjusting screwdriver: 1 pc. |
Note 1 : Where measurement conditions have not been specified precisely, the conditions used were an ambient temperature of +20 ℃ +68 ℉.
Note 2 : These values are for a range which is 20 to 60 % of the maximum sensing distance.
Note 3 : Take care that the output voltage is reduced due to the resistance of the wiring cable.
Note 4 : The given weight of the threaded type sensor head is the value including the weight of the nuts and the toothed lock washer.
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Dimensions
- Unit: mm in
Sensor head
GP-A5S(I)
GP-A8S(I)
GP-A10M(I)
GP-A12ML(I)
GP-A14F(I)
Amplifier
All models
Cover removed condition
MS-SS5 MS-SS8
Mounting bracket for GP-A5S(I) (Optional),
Mounting bracket for GP-A8S(I) (Optional)
Material:Nylon 66
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I/O Circuit and Wiring diagrams
I/O circuit diagram
Notes:
1)
In case of using the analog voltage output, connect a device having a high input impedance. Also, take care that the output voltage is reduced due to the resistance of the wiring cable.
2)
The alarm output is not incorporated with a short-circuit protection circuit. Do not connect it directly to a power supply or a capacitive load.
Symbols・・・
D1: Input protection diode
D2: Reverse supply polarity protection diode
ZD: Surge absorption zener diode
Tr : NPN output transistor
Wiring diagram
Note:
After the wiring, make sure to fit the terminal covers. The terminal cover having a concave depression at the top should be fitted on the side having terminal Nos. 1 to 4.
*1
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Sensing characteristics
Correlation between material and output voltage / current
The GP-A series is made for all types of standard iron sensing objects. The graph below describes the output discrepancies that occur when detecting different types of metals.
GP-A5S(I)
GP-A8S(I) GP-A10M(I)
GP-A12ML(I)
GP-A14F(I)
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Cautions For Use
- Never use this product as a sensing device for personnel protection.
- In case of using sensing devices for personnel protection, use products which meet laws and standards, such as OSHA, ANSI or IEC etc., for personnel protection applicable in each region or country.
・Make sure to use in combination the sensor head and amplifier which have the same production serial number (5 digits). Since adjustment is done before shipment, if items with different production serial numbers are combined, the sensing characteristics will deteriorate even if they have the same model number.
・The length of the sensor head cable cannot be changed.
Linearity in case of disc-shaped or cylindrical objects
Model No. | Iron disc diameter ø (mm in) | Iron cylinder diameter ø (mm in) |
---|---|---|
GP-A5S(I) | 12 0.472 | 10 0.394 |
GP-A8S(I) | 12 0.472 | 10 0.394 |
GP-A10M(I) | 12 0.472 | 10 0.394 |
GP-A12ML(I) | 30 1.118 | 50 1.969 |
GP-A14F(I) | 12 0.472 | 10 0.394 |
- In case the sensing object is disc-shaped or cylindrical, the linearity of the analog output varies with the sensing object size. In such a case, conduct zero adjustment when close mounting and, by adjusting to the maximum sensing distance and to 5 V as the voltage output (current output 20 mA), linearity (±0.5 % F.S.) can be attained on a full-scale if the sensing object’s size is larger than those described in the table below.
Mounting sensor head
Mounting with set screw
<Non-threaded type sensor head>
Model No. | A (mm in) | Tightening torque |
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GP-A5S(I) | 5 0.197 or more | 0.44 N·m |
GP-A8S(I) | 0.58 N·m |
Note:
Do not apply excess torque.
Mounting with nut
<Threaded type sensor head>
Model No. | B (mm in) | Tightening torque |
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GP-A10M(I) | 7 0.276 or more | 9.8 N·m |
GP-A12ML(I) | 14 0.551 or more | 20 N·m |
Note: Install in such as way so that the nut does not protrude from the screw.
Mounting GP-A14(l)
- The tightening torque should be under the value given below.
- Make sure to use an M3 or smaller set screw having a cup-point.
- The tightening torque should be under the value given below.
Distance from surrounding metal
<Embedding of the sensor in metal>
- GP-A14F(I) can be used by being completely embedded in metal.
However, the surrounding metal should not protrude beyond the
sensing face.
<Non-threaded type sensor head
threaded type sensor head>
<Front sensing type sensor head>
Model No. | C (mm in) | D (mm in) |
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GP-A5S(I) | ø18 ø0.709 | 4 0.157 |
GP-A8S(I) | ||
GP-A10M(I) | 7 0.276 | |
GP-A12ML(I) | ø50 ø1.969 | 14 0.551 |
Mutual interference
- When two or more sensor
heads are installed in
parallel or face to face, since
the specifications may not
be met, keep the minimum
separation distance
specified in the table below.
<Non-threaded type sensor head
threaded type sensor head>
<Front sensing type sensor head>
Model No. | E (mm in) | |
---|---|---|
Between “I” type and non-“I” type | Between two “I” types or two non-“I” types | |
GP-A5S(I) | 11 0.433 | 36 1.417 |
GP-A8S(I) GP-A10M(I) | 11 0.433 | 38 1.496 |
GP-A12ML(I) | 14 0.551 | 130 5.118 |
GP-A14F(I) | 0 0 | 30 1.181 |
Notes:
1) “I” type is different frequency type.
2) If the required resolution is lower than the specification (0.04 % F.S.), it is possible to bring the sensor heads nearer than the separation distances given in the table above. For further details, please contact our office.
- As metal around the sensor may affect the sensing performance, pay attention to the following points.
- Since the analog output may change if the sensor is completely embedded in metal, keep the minimum distance specified in the table below.
Dimensions of suitable crimp terminals
Note:
Please use crimp terminals which have insulation sleeves.
Recommended crimp terminal: Type 1.25 – 3.0
Others
- Do not use during the initial transient time (0.5 sec.) after the power supply is switched on.
- Do not use the sensor at places having intense vibrations, as this can cause malfunction.