Can a Small Pressure Transmitter Be Installed on Equipment with High Vibration?

Yes, but its suitability for high-vibration conditions cannot be determined solely by its small size and light weight. Whether it can operate reliably over the long term depends on whether the transmitter’s vibration resistance, vibration characteristics at the site, pressure connection design, and installation method are all compatible.

During operation, pumps, compressors, construction machinery, and automation equipment can transmit vibration to the transmitter through the equipment housing or pressure lines. Strong vibration may cause issues such as loose connections, cable fatigue, and output fluctuations, all of which can affect measurement results.

Before selecting a model, gather as much information as possible about the vibration frequency, acceleration, and shock conditions at the installation point, and ask the supplier to confirm the product’s vibration test conditions. For critical measurement points, on-site verification using the actual installation structure should also be considered.

1. First, Understand the Effects of Vibration

Vibration Affects More Than Just the Measurement Readings

Continuous vibration may cause poor contact at electrical connections and expose threaded connections and seals to cyclic loads. Even if readings are normal when the equipment is first commissioned, monitor for zero-point drift, signal interruptions, and leaks during long-term operation.

When the vibration frequency of the equipment is close to the natural frequency of the mounting bracket or transmitter structure, the local vibration amplitude may increase. Simply reinforcing the bracket may not solve the problem; on-site testing may be needed to adjust the mounting method or location.

Mechanical vibration should also be distinguished from pressure pulsation in the process medium. Mechanical vibration is transmitted through the housing, bracket, and piping, while pressure pulsation results from changes in medium pressure caused by components such as pumps and valves. Both may occur at the same time and should be investigated separately.

2. How to Determine Whether the Product’s Vibration Resistance Is Adequate

Compare Product Specifications with Measurements at the Installation Point

Vibration resistance specifications typically include a frequency range and acceleration, and may also specify the test direction, duration, and product operating state. For example, a rating of “20g, 20–5000Hz” describes parameters under specific conditions; it does not mean the product will maintain its rated accuracy in every vibration environment.

When assessing site conditions, consider different operating stages, including startup, steady operation, and shutdown. If necessary, use a vibration meter to record data at the installation point. If frequent impacts or transient shocks occur, check the product’s shock rating separately rather than relying only on continuous vibration specifications.

Test values in product documentation must be interpreted in light of the test method. In addition to confirming whether the frequency and acceleration ranges cover site conditions, ask the supplier about the allowable performance change after testing, the installation orientation, and the specific acceptance criteria.

Reference Product Specifications

Products intended for different measurement tasks are not directly interchangeable. For example, CY-DB33 Domestic Level Transmitter, Liquid Crystal Display, Explosion-Proof Level Sensor is used for level measurement. Its documentation lists mechanical vibration parameters of 20g (20–5000Hz) and a shock parameter of 100g (11ms).

The documentation for this model also lists optional overall accuracy classes of 0.1, 0.3, and 0.5, as well as output options such as 4–20mA, 1–5V, and 0–5V. The actual configuration, test conditions associated with the specifications, and applicable ranges should be confirmed against the order documentation and with the manufacturer.

These level transmitter specifications are provided only as a reference for understanding how parameters are expressed; they do not establish the vibration resistance of other small pressure transmitters. For use in hazardous areas, also verify the explosion-proof certification, markings, and installation requirements for the specific model.

3. Selection and Installation for High-Vibration Conditions

First Check the Pressure, Connection, and Environmental Conditions

The measurement range should cover normal operating pressure as well as pressure peaks caused by startup, shutdown, and valve operation. Range, allowable overload, and burst pressure are different specifications and must be checked separately; overload capacity should not be treated as the continuous operating range.

The pressure connection’s thread specification, sealing method, and wetted materials should be compatible with the equipment and medium. For high-temperature or corrosive media, or conditions where clogging may occur, also confirm temperature limits and isolation arrangements. Do not focus only on vibration resistance and overlook other potential failure risks.

For the electrical setup, select the output signal, power supply, and connector to suit the control system, and confirm the enclosure protection rating required for the site. Leave appropriate slack in the cable and position fixing points so the cable does not repeatedly bend at the outlet. Also ensure that the cable is not directly subjected to tensile force.

Choose an Installation Method Suited to Site Conditions

If vibration at the equipment mounting point is within the product’s allowable range and the connection is adequately supported, the transmitter can be installed directly in accordance with the manufacturer’s instructions. Use compatible seals and tools, and tighten as specified. Do not apply force through the housing or electrical connector.

If vibration at the installation point is excessive or space is limited, consider using an impulse line or flexible hose suitable for the medium and pressure rating to install the transmitter in a more stable location. Secure the piping reliably and account for temperature, fatigue, leakage, blockage, and response delay.

For significant pressure pulsation, a snubber or other mitigation measure may be used if permitted by the process requirements. Damping affects response speed, so increasing damping should not be relied on as a simple solution to eliminate all fluctuations. Consider in particular the response time required for equipment protection and fast control.

4. Post-Commissioning Inspection and Maintenance

Confirm Long-Term Stability Through Comparison and Regular Inspection

During initial commissioning, observe the output with the equipment both stopped and running, and compare it with a verified reference pressure gauge or system measurement. If the readings fluctuate noticeably only within a certain speed range, investigate vibration and pressure pulsation at that speed.

Routine maintenance should include checking for leaks at the connection, loose fasteners, worn cable sheathing, and intermittent output signal abnormalities. Before maintenance, isolate the pressure in accordance with site procedures, confirm the condition of the medium, and disconnect the necessary power supply.

For critical measurement points, schedule calibration based on the operating environment, equipment maintenance intervals, and metrology management requirements. If persistent zero-point deviation, repeatedly loose connections, or cable damage occurs, identify the cause and revise the installation plan. Do not rely solely on retightening or repeatedly adjusting the zero point.

If you are selecting a model for a pump, compressor, or other vibrating equipment, provide Xi’an Shenghongchuang Instrumentation Co., Ltd. with the measurement medium, normal and peak pressures, connection specifications, power supply and output requirements, and vibration frequency and acceleration data at the installation point. This will help confirm a suitable model and installation plan.