VEGABAR 81 Pressure Transmitter Overview
VEGABAR 81 is a high-performance pressure transmitter launched by VEGA, widely used in industrial process measurement. It uses a ceramic capacitive measuring principle and is suitable for pressure monitoring of gases, vapors, and liquids.
This product has high overload capacity and long-term stability, making it an ideal choice for the chemical, petrochemical, water treatment, and other industries. This article provides the download of the VEGABAR 81 Chinese manual and summarizes key technical information.
Main Technical Parameters
The table below lists the core performance indicators of the VEGABAR 81 for selection reference.
| Parameter | Value |
|---|---|
| Measuring range | 0 ~ 0.1 bar to 0 ~ 100 bar |
| Accuracy | ±0.2% FS |
| Process temperature | -40 ~ +150 °C |
| Ambient temperature | -40 ~ +80 °C |
| Output signal | 4 ~ 20 mA / HART |
| Protection rating | IP66/IP67 |
| Process connection | Thread, flange, hygienic type |
Selection Points
1. Measuring Range and Overload
Select the range according to the actual maximum working pressure. It is recommended to reserve more than 20% margin. The overload capacity of the VEGABAR 81 can reach twice the range.
2. Process Connection and Material
- Thread connection: G1/2, G1, NPT, etc.
- Flange connection: DN25 ~ DN100
- Wetted materials: stainless steel 316L, Hastelloy, ceramics
3. Output and Communication
The standard output is 4~20 mA, with optional HART protocol. If on-site display is required, a version with a display head is available.
Installation and Commissioning Steps
Correct installation is the prerequisite for ensuring measurement accuracy. Please follow the steps below:
- Confirm that the process connection matches the pipeline interface and install the sealing gasket.
- Screw in or flange-mount the transmitter, avoiding over-tightening.
- Wiring: connect the positive power supply to +, the signal line to -, and ground the shield.
- After power-on, use a HART handheld communicator or VEGA adjustment software to perform zero calibration.
- Set the upper and lower range limits and check whether the output current corresponds.
Common Faults and Handling
- No output signal: Check whether the power supply voltage is between 12~36 V DC and whether the wiring is loose.
- Large output current deviation: Recalibrate the zero point and range, and check whether the process pressure is stable.
- Fluctuating display value: Confirm the damping setting and check whether the medium is pulsating or the pipeline is vibrating.
- Communication failure: Check whether the HART loop resistance is ≥ 250 Ω.
Summary
The VEGABAR 81 is a reliable pressure transmitter. Correct selection and installation can significantly improve measurement accuracy. For complete documentation, please click the link above to download the VEGABAR 81 Chinese manual.