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In this article, we'll guide you through key considerations when choosing a pneumatic positioner, including installation options, size compatibility, and features like communication protocols.
Direct-Insert vs Non-Direct-Insert Pneumatic Positioners
One of the first decisions when selecting a pneumatic positioner is whether to go with a direct-insert or non-direct-insert model. Both serve the same function, but they differ in installation and convenience.
What’s the difference between direct-insert and non-direct-insert?
- Direct-Insert Pneumatic Positioner
This model is designed for easy installation. The positioner can be directly inserted into the actuator without needing additional screws or complicated assembly steps.
- Non-Direct-Insert Pneumatic Positioner
This version requires additional steps, such as attaching screws to secure the positioner to the actuator. While it may be necessary for certain applications, it is generally less convenient and takes more time to install compared to the direct-insert version.
Why choose direct-insert pneumatic positioner?
We recommend direct-insert pneumatic positioners to most customers due to their ease of installation. The direct-insertion design eliminates the extra steps of screwing in the positioner, making the setup quicker and simpler.
Which pneumatic valves and actuators work with pneumatic positioners?
There is no specific size limitation for pneumatic positioners.
Whether you're working with small or large valves, the right positioner will ensure that your actuator functions precisely.
It's not uncommon for customers to notice damage to the packaging when receiving pneumatic positioners. This is especially true for direct-insert positioners.
Why does the box get punctured?
In some cases, the rod of the direct-insert positioner may extend out of the packaging and cause the box to get punctured.
This is a normal occurrence for these types of positioners, as the rod extends during shipping.
How to prevent box damage during shipping?
To prevent damage to the packaging, we recommend using shaft protectors during shipping. These protectors safeguard the positioner's rod, ensuring that the packaging remains intact and preventing any punctures.
What is "Digital Pulse"?
The term digital pulse refers to a signal with a communication protocol, such as HART (Highway Addressable Remote Transducer).
HART is one of the most widely used communication protocols for industrial automation, and many positioners today are equipped with this feature. It allows for easy integration with control systems and offers more accurate diagnostics and adjustments.
Currently, most domestic pneumatic positioners support only the HART protocol.
Is there a profibus positioner?
No, Hearken only offers HART protocol positioner.
Are there any pneumatic positioners with Exia and Exd explosion-proof marks for -60 degrees?
We don’t have low-temperature pneumatic positioners, and below -20 degrees, they do not meet the explosion-proof requirements.
Conclusion
Choosing the right pneumatic positioner depends on your specific needs, including installation convenience, size compatibility, communication requirements, and environmental conditions.
