IP68 ±0.1 mm Absolute Stroke Sensor with Permanent Position Memory
The CPMS-JD-mini is an absolute stroke sensor built for closed-loop control of hydraulic cylinders. Active magnetic detection, ±0.1 mm detection accuracy and permanent position memory keep cylinder feedback stable after power-off, while an IP68 iron housing keeps the unit working where oil, dust and washdown are routine.
Absolute measurement±0.1 mm accuracyIP68 protection9 m/s operating speedSSI / Modbus / CANopen / 4~20mA
CPMS-JD-mini absolute stroke sensor for hydraulic cylinder position feedback
Listing TitleIP68 ±0.1 mm Absolute Stroke Sensor with Permanent Position Memory
SEO TitleIP68 Absolute Stroke Sensor ±0.1 mm SSI Modbus CANopen 4-20mA Output
Meta DescriptionIP68 absolute stroke sensor CPMS-JD-mini with ±0.1 mm accuracy, permanent power-off memory, 9 m/s operating speed and SSI, Modbus, CANopen or 4-20mA output.
URL Slug/cpms-jd-mini-absolute-stroke-sensor
Key Features
Absolute reading, no cumulative error
Position is measured absolutely rather than counted, so long-stroke cylinders do not drift over repeated cycles.
±0.1 mm detection accuracy
Tight position feedback for cylinder synchronization, press levelling and gate lifting sequences.
Permanent power-off memory
The machine restarts from a known position after a shutdown, with no re-homing routine.
IP68 protection rating
Sealed against oil, dust and washdown around hydraulic power units and machine frames.
9 m/s operating speed
Feedback keeps pace with fast reciprocating cycles in automated hydraulic equipment.
High anti-interference ability
Active magnetic detection with a high-performance data acquisition and processing chip keeps signals stable next to valves and motors.
Technical Specifications
Parameter
Value
Model
CPMS-JD-mini
Sensor type
Absolute
Detection accuracy
±0.1 mm
Protection rating
IP68
Power-off memory time
Permanent
Cumulative error
No
Operating speed
9 m/s
Anti-interference ability
High
Output signal / protocol
SSI / Modbus / CANopen / 4~20mA
Housing material
Iron
Application
Hydraulic cylinder stroke detection and position feedback
Models and Options
One sensor model is offered: the CPMS-JD-mini. The configurable difference is the output interface, selected against the controller already installed on the machine.
Output option
What it means for the project
SSI
Serial synchronous interface for drives and controllers that accept absolute position words.
Modbus
Fieldbus option where position is read through the machine network.
CANopen
Fieldbus option for CAN-based control architectures.
4~20mA
Analog current loop for PLC or panel inputs.
Specify the protocol required when ordering so the sensor is configured before shipment.
Materials and Structure
The sensor uses an iron housing and an active magnetic detection principle developed in-house by Wujin Hydraulic. A special structure is designed on the piston rod surface so the sensor obtains accurate real-time position information when approaching, delivering high-precision, high-reliability monitoring of cylinder stroke.
Iron housing with IP68 sealing for hydraulic equipment environments.
High-performance data acquisition and processing chip for sensitivity and frequency response.
Active magnetic detection, cited by the manufacturer as more sensitive and better in temperature adaptability and frequency response than traditional Hall sensors.
Applications
Hydraulic cylinders and hoists
Position feedback for hydraulic cylinders in general hydraulic equipment and integrated hydraulic hoists.
Automotive stamping lines
Matched equipment for press cushion cylinders, moving bolster balance cylinders and ejector cylinders in reciprocating cycle operation.
Construction machinery
Supporting excavator, aerial work platform, crane and loader cylinders where positioning precision matters.
Mining and tunneling
Paired with roadheader cylinders and shield support advance cylinders working under vibration, dust and humidity.
Metallurgy and energy
Feedback on hydraulic systems exposed to high temperatures, heavy dust and heavy loads.
Marine, offshore and water conservancy
Used in offshore hydraulic equipment and in lock gate and dam gate hoisting systems.
Customization
Configuration starts with the output interface: SSI, Modbus, CANopen or 4~20mA. Where the sensor is supplied together with a Wujin Hydraulic cylinder, the piston rod structure required by the active magnetic detection principle is defined by the cylinder manufacturer during design, which removes the mismatch risk between rod and sensor. An R&D team of 40 engineers supports application review, and the company operates ISO 9001, ISO 14001 and ISO 45001 certified management systems.
Case Study
An EPC contractor in China received 30 units of hydraulic hoisting equipment for lock gate operation, with a 30-year design life. Each hydraulic hoist was integrated with the CPMS-JD absolute stroke sensor, providing millimeter-level positioning accuracy and strong resistance to electromagnetic interference. The sensor delivered precise, stable position feedback so the gates continued to operate reliably in a demanding environment.
FAQ
Which output signals can the CPMS-JD-mini be supplied with?
SSI, Modbus, CANopen or 4~20mA. Tell us which interface your controller accepts and the sensor is configured accordingly.
What detection accuracy does the sensor achieve?
The specified detection accuracy is ±0.1 mm.
Does the position reading disappear when power is switched off?
No. The sensor is absolute type with permanent power-off memory time, so position is retained without a backup routine.
Does the reading drift over many cycles?
No. The sensor has no cumulative error because position is measured absolutely rather than accumulated.
What is the protection rating for oil and washdown areas?
IP68, with an iron housing.
Can it follow a fast cylinder?
The rated operating speed is 9 m/s, and the high anti-interference design supports stable feedback in electrically noisy machine environments.
What information should we send with an inquiry?
Cylinder or hoist model, required stroke range, chosen output protocol, controller type and the quantity you plan to order. Our engineers review the match before quoting.
Can the sensor be supplied together with the cylinder?
Yes. Wujin Hydraulic manufactures hydraulic cylinders and hoists, so the piston rod structure and sensor can be specified as one assembly.
Image Filename and Alt Suggestions
cpms-jd-mini-stroke-sensor-absolute-ip68-front.png — alt: CPMS-JD-mini absolute stroke sensor with iron housing, front view
cpms-jd-mini-stroke-sensor-cable-output-detail.png — alt: Cable outlet and connector detail of the CPMS-JD-mini stroke sensor
cpms-jd-mini-stroke-sensor-cylinder-mounting.png — alt: Sensor mounted on a hydraulic cylinder for stroke position feedback
Request a Stroke Sensor Quotation
Jiangsu Wujin Hydraulic Hoist Co., Ltd. — founded 1970, 80,000 m² factory, 300 employees, serving more than 5,000 customers in over 30 countries and regions.
Contact: Vincy Wang · export@wjhydro.com · Tel / WhatsApp +86 18861256710 · Benniu Town, Xinbei District, Changzhou City, Jiangsu Province, P.R. China
State the output protocol: SSI, Modbus, CANopen or 4~20mA
Share cylinder or hoist drawings and the stroke range to be monitored
Confirm quantity and destination so the offer can be prepared
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