Archive for category pressure transmitters

Comparing Honeywell smart transmitters

Honeywell ST800 Smartline TransmitterHoneywell’s new SmartLine ST700 and ST800 pressure transmitter lines are replacing the existing ST3000 100 and 900 series.

If you’re using ST3000 100 series transmitters, you’ll be looking at the ST800 for future units.  If you’re using the ST3000 900 series, the ST700 will be your better fit.

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What does NAMUR NE 43 do for me?

People have asked me about setting fault alarms in level transmitter analog signals at 2mA or 3mA levels. What they typically don’t understand is that a two-wire transmitter uses the electrical current below 3.6 mA for its own power and operation. So, a 2.0 mA or 3.0 mA fault indication just isn’t possible. At these low currents, there wouldn’t be enough power to generate the fault indication signal and to keep the transmitter functioning properly. Read the rest of this entry »

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Should I use a chemical seal with my pressure instruments?

Diaphragm seal mounts directly into the process linke to reduce damage to the Bourdon tube.Pressure instruments in contact with the process can take a real beating. Process fluids can corrode the wetted parts and destroy the sensing element.  Media the solidifies can clog the pressure-sensing port.  Or, an installed instrument can affect the process by providing a spot for media remnants to remain after cleaning and purging. Specialized chemical seals deal with these pressure sensing issues.

Here’s a list of questions to ask about your application that will determine if you need a chemical seal with your gauge, switch, or transmitter.

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