SJ-821 Tension Amplifier with SJ-CZ Series Tension Sensor

High-Precision Signal Amplification Solution for Continuous Material Tension Detection
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Product description
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Tension Sensor Amplifier

SJ-821 Tension Amplifier with SJ-CZ Series Tension Sensor

High-precision signal amplification solution for stable tension detection and control in continuous material production lines.

The SJ-821 tension amplifier is designed to work with the SJ-CZ series tension sensors, providing stable signal amplification for industrial tension detection and control systems. With native wiring compatibility, reliable signal processing, and support for analog and digital communication, it is suitable for continuous material production lines such as film, paper, cable, metal foil, and other roll-to-roll processing applications.

01

Native Compatibility

The SJ-821 amplifier is natively compatible with SJ-CZ series tension sensors. The wiring definition matches directly, reducing installation complexity.

02

High-Precision Closed Loop

Sensor output signals are amplified with low signal loss, helping deliver stable and reliable tension feedback.

03

Industrial Integration

Supports analog signal and digital communication, making it easy to connect with different industrial control equipment.

04

One-Stop Solution

The amplifier and sensor belong to the same industrial system, supporting unified technical service and easier troubleshooting.

Key Advantages

  • Directly compatible with SJ-CZ series tension sensors.
  • No additional wiring conversion required for standard matching use.
  • Low-loss signal amplification for stable output performance.
  • Supports analog and digital communication integration.
  • Designed for continuous material tension detection and control.

Application Materials

  • Plastic film production and converting lines.
  • Paper processing and roll material production lines.
  • Cable, wire, and continuous strip material production.
  • Metal foil and composite material processing lines.
  • Roll-to-roll tension detection and closed-loop control systems.
Product Information
Product CategoryTension Sensor Amplifier / Web Tension Detection System
Product NameSJ-821 Tension Amplifier with SJ-CZ Series Tension Sensor
Compatible SensorSJ-CZ Series Tension Sensor
Signal ProcessingLow-Loss Amplification for Stable Tension Signal Output
Communication SupportAnalog Signal + Digital Communication
Suitable MaterialsFilm, Paper, Cable, Metal Foil and Other Continuous Materials
ApplicationTension Detection, Web Tension Control, Roll-to-Roll Processing Lines
Service AdvantageUnified Technical Support, Standardized Troubleshooting and After-Sales Service

Reliable Tension Signal Amplification for Industrial Web Processing

The SJ-821 amplifier and SJ-CZ tension sensor series provide an integrated tension detection solution for continuous material production. With matched compatibility, stable signal output, and convenient system integration, the solution helps improve production reliability and reduce troubleshooting time.

Product FAQ
SJ-CZ Tension Sensor & SJ821 Amplifier FAQ

This FAQ covers model selection, installation, wiring, calibration, communication settings and troubleshooting for the SJ-CZ through-shaft tension sensor and SJ821 tension signal amplifier.

01
Basic Parameters & Model Selection
What rated tension specifications are available for the SJ-CZ series sensor?
The rated tension options include 15KG, 30KG, 50KG and 100KG.
Can the bearing inner diameter of the SJ-CZ sensor be customized?
Standard bearing inner diameters are available in Φ17mm and Φ25mm. For special size requirements, please consult the manufacturer.
What is the power supply requirement for the SJ821 amplifier?
The SJ821 amplifier requires a 220VAC ±10% power supply.
What types of analog output signals does the SJ821 support?
It supports 0-10V voltage output or 4-20mA current output. The output type can be switched through parameter settings.
02
Installation & Wiring
How many standard installation methods are available for the SJ-CZ sensor?
There are two standard installation methods: inner-side installation and outer-side installation. The sensor can be installed on the machine wall plate or mounting bracket.
What are the bearing requirements at both ends of the measuring roller when installing the SJ-CZ sensor?
Only one end of the measuring roller should be locked, while the other end must allow free axial expansion and contraction. The measuring roller must also be processed with both dynamic balancing and static balancing.
How should the sensor input terminals of the SJ821 amplifier be connected?
  • Channel 1: 23 shield, 24 white, 25 black, 26 green, 27 yellow.
  • Channel 2: 28 shield, 29 white, 30 black, 31 green, 32 yellow.
03
Debugging & Calibration
What conditions must be met before zero adjustment, P.02 / P.03?
Zero adjustment must be performed under a no-tension condition. There should be no material or additional load on the tension roller.
How should the full-scale value, P.04 / P.05, of the SJ821 be set?
Enter the total rated load of all sensors connected to the corresponding channel, in kg. For example, if Channel 1 is connected to one 30KG sensor, enter 30. If it is connected to two 30KG sensors, enter 60.
What is the recommended calibration weight?
It is recommended to use a standard weight equal to 30%-70% of the full-scale range. The best calibration weight is about 50% of the full-scale range.
What should I do if I forget the SJ821 operation password?
Enter the universal password “139” to access the program. Then you can modify the password setting value in parameter P.12.
04
Communication & Host System
What communication protocol does the SJ821 support?
The SJ821 is equipped with a standard RS485 interface and follows the Modbus-RTU protocol. It only supports function code 03, read holding registers, and function code 06, write single holding register.
What are the default communication parameters of the SJ821?
The default baud rate is 9600bps, with 8 data bits, no parity and 1 stop bit. The baud rate can be switched between 4800bps and 115200bps.
05
Troubleshooting
What should I check if a fault occurs during trial operation adjustment?
Please check the following items first:
  • Whether the tension roller is too heavy and exceeds the zero adjustment range.
  • Whether there is residual material or extra load on the roller.
  • Whether the sensor wiring is correct.
  • Whether the sensor or amplifier is faulty.
What should I do if the tension zero point frequently drifts during operation?
This is usually caused by installation problems. Check whether the sensor is mounted with distortion, and whether the sensors at both ends are installed on the same plane.
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