1. Introduction
The MASTECH MS7222 RTD Calibrator is a specialized tool designed for the calibration of Resistance Temperature Detector (RTD) transmitters, including those with pulsed outputs. This instrument is capable of both simulating and measuring seven distinct types of RTDs, with readings displayed in either Celsius (°C) or Fahrenheit (°F), as well as resistance in ohms. It is important to note that the MS7222 cannot simultaneously function as a source and a measurement tool.
2. Safety Information
Please read and understand all safety instructions before operating the MS7222 RTD Calibrator. Failure to follow these instructions may result in injury or damage to the instrument.
- General Safety: This device complies with IEC61010-1, 300V CAT.III, Pollution Degree 2 standards. Always operate the calibrator within its specified limits.
- Electrical Shock Hazard: To prevent electrical shock, always remove test leads from the calibrator before opening the case or battery compartment.
- Damage Prevention: To prevent damage or injury, ensure quick-acting fuses with the specified amp/volt ratings are installed. The required fuse specification is F: 0.125A/250V 5x20 DC60V NEDA1804 GF22.006P.
- Battery Safety: Ensure correct battery polarity when installing. Do not mix old and new batteries or different types of batteries.
Always refer to the full safety guidelines provided in the included documentation.
3. Package Contents
Verify that all items listed below are present and in good condition upon unpacking:
- 1 x MASTECH MS7222 RTD Calibrator
- 1 x Set of Test Leads (red and black, typically with alligator clips)
- 1 x Instruction Manual / Product Certificate
- 1 x Protective Carrying Case
4. Product Overview
The MS7222 RTD Calibrator features a robust design with an intuitive interface for ease of use.
4.1 Front Panel and Controls
- LCD Display: Shows measurement values, RTD type, and units.
- POWER Button: Turns the device on or off.
- RTD TYPE Button: Cycles through available RTD types (e.g., Pt10, Pt100).
- °C/°F Button: Toggles between Celsius and Fahrenheit temperature units.
- INPUT/OUTPUT Button: Switches between measurement (Input) and simulation (Output) modes.
- Percentage Buttons (+25%, 100%, -25%, 0%): Provide quick adjustments to the output value in simulation mode.
- Up/Down Arrow Buttons: Used for fine adjustment of values in simulation mode or navigating menus.
- Input/Output Jacks: Connect test leads for 2-wire, 3-wire, or 4-wire RTD configurations.
4.2 Rear Panel
The rear panel contains the battery compartment and important safety labels, as detailed in Section 2.
4.3 Kickstand
An integrated kickstand allows for convenient angled viewing on a workbench.
5. Setup
5.1 Battery Installation
- Ensure the calibrator is powered off and all test leads are disconnected.
- Locate the battery compartment on the rear panel of the device.
- Open the battery compartment cover.
- Insert the required batteries, observing correct polarity (+/-).
- Close the battery compartment cover securely.
5.2 Connecting Test Leads
Connect the test leads to the appropriate input/output jacks on the front panel based on the RTD configuration (2-wire, 3-wire, or 4-wire) you intend to measure or simulate. Ensure connections are firm.
6. Operating Instructions
6.1 Power On/Off
- Press the POWER button to turn the calibrator on.
- Press and hold the POWER button to turn the calibrator off.
6.2 Selecting RTD Type
- Press the RTD TYPE button to cycle through the available RTD types (e.g., Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000(385), Pt100(JIS)). The selected type will be displayed on the LCD.
6.3 Selecting Temperature Units
- Press the °C/°F button to toggle between Celsius and Fahrenheit temperature units.
6.4 Input (Measurement) Mode
- Press the INPUT/OUTPUT button until "INPUT" is indicated on the display.
- Connect the RTD to be measured to the appropriate input jacks using the test leads.
- The calibrator will display the measured temperature or resistance value.
6.5 Output (Simulation) Mode
- Press the INPUT/OUTPUT button until "OUTPUT" is indicated on the display.
- Select the desired RTD type using the RTD TYPE button.
- Connect the device under test to the appropriate output jacks using the test leads.
- Use the Up/Down Arrow buttons to adjust the desired temperature or resistance value.
- For quick adjustments, use the +25%, 100%, -25%, 0% buttons to set common percentage values of the full scale.
6.6 Simulating Additional RTDs (Ohms Output)
The calibrator can simulate additional RTD types by using its Ohms output function. Refer to the RTD resistance tables for the specific RTD type you wish to simulate and manually set the corresponding resistance value in Ohms output mode.
7. Maintenance
7.1 Cleaning
Wipe the calibrator with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the device is powered off and disconnected before cleaning.
7.2 Battery Replacement
When the low battery indicator appears on the display, replace the batteries as described in Section 5.1. Always use fresh batteries of the specified type.
7.3 Fuse Replacement
If the calibrator fails to power on or function correctly, a fuse may need replacement. Refer to the safety warnings on the back panel for the correct fuse specifications (F: 0.125A/250V 5x20 DC60V NEDA1804 GF22.006P). Always disconnect power and test leads before attempting fuse replacement. If unsure, consult qualified service personnel.
8. Troubleshooting
- Device does not power on: Check battery installation and charge level. Ensure fuses are intact and correctly rated.
- Inaccurate readings/simulations: Verify test lead connections are secure and correct for the RTD type. Ensure the correct RTD type is selected on the calibrator. Check for damaged test leads.
- Display issues: If the display is dim or erratic, replace batteries.
- No output in simulation mode: Confirm the calibrator is in "OUTPUT" mode and the desired value is set. Check connections to the device under test.
For persistent issues, refer to the detailed troubleshooting section in the complete user manual or contact customer support.
9. Specifications
| Parameter | Value |
|---|---|
| Function | Measure / Simulate RTD or Ohm |
| Resistance Range | 0Ω to 3200Ω |
| Resistance Resolution | 0.1Ω |
| Resistance Accuracy | 0.1Ω to 1Ω |
| Supported RTD Types | Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000(385), Pt100(JIS) |
| DIY Supplies Category | Electrical |
| Origin | Mainland China |
| Certification | CE |
| Material | Metal, Plastic |
10. User Tips
- Always ensure proper connection of test leads to avoid measurement errors and ensure safety.
- When simulating, double-check the selected RTD type and temperature units to match the requirements of the device being calibrated.
- For critical measurements, allow the calibrator to stabilize at the ambient temperature before use.
- Keep the calibrator and its accessories clean and stored in the protective case when not in use to prolong its lifespan.
11. Warranty and Support
11.1 Warranty Information
This MASTECH MS7222 RTD Calibrator comes with a 1-year warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.
11.2 Technical Support
For technical assistance, troubleshooting, or warranty service, please refer to the contact information provided in the original product packaging or visit the official MASTECH website for support resources.
