Posts Tagged smart transmitter

Minimizing shift on a draft range differential pressure transmitter

A while ago, I got a call from a customer who was having trouble with a differential pressure transmitter. He was using a draft range DP transmitter to measure the pressure in a combustion chamber, so it could be controlled with a damper. He had one port connected to the combustion chamber with impulse tubing, and the other (low side) was left open to the atmosphere.

He’d noticed that when a fork truck or other vehicle sped past the furnace – the transmitter was mounted next to a traffic lane — it cause the furnace pressure to momentarily dip downward, and cause the damper to oscillate.

He figured out that the air movement provided by the passing vehicle was creating a momentary pressure pulse on the low side port. These air movements were creating difficulty in maintaining furnace pressure.

So, he asked me, “How can we dampen the effect of the momentary pressure pulse?”

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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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How can I keep the water out of my transmitters in washdown conditions?

Earlier this week, I took a call from a customer having problems with his pressure transmitter.  He’d figured out that his last transmitter, installed in an area with nearly continuous wash-downs, had failed because of water intrusion.  The bigger problem was that it wasn’t coming from a loose cover, a conduit pipe, or a leaky conduit connection.  In his case, the water came into the transmitter through a vent hole and messed up the measurement cell electronics.

So he asked me to recommend a 3000 PSI transmitter that could survive the washdown conditions.

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