Archive for category Repairs

Why is my clamp-on flowmeter’s flow rate stuck at zero?

Siemens ultrasonic clamp-on flowmeter sensors mounted to a pipeI was working with a customer to replace a Siemens clamp-on ultrasonic flowmeter after its electronics had been replaced.  We followed all the connection and startup instructions, but the flow rate was stuck at 0.00 – no dithering, no hunting, not a single flicker in the low-order digits.

Very strange.

Ultrasonic clamp-on flowmeters can be very sensitive to low flows. But even at no flow with the pump turned off or the line isolated, the digits to the right of the decimal point would dither around zero, showing some very small positive values, some very small negative values.  It’s the nature of the beast.

So why were we getting an absolute zero reading? What was going on?

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Repair or replace? Which should I do?

It’s a common question that doesn’t come with a straightforward answer. Our customers make a significant investment in instrumentation, so if something can be repaired, it’s usually easier to get past the budget department.  But there are several factors to consider first.   Read the rest of this entry »

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Save your custom configuration! Avoid the headaches!

Do you need to send an instrument to the factory for repair or service? Before you disconnect it, pack it up, and ship it out, be sure you do the following:

  1. Make a backup or copy of your instrument configuration, so you can quickly reinstate the settings.
  2. Make sure you have a written record of your settings on file. Several manufacturers include a configuration worksheet in the instrument user manual. If it’s not there, you can write them on a copy of the quick-start or setup installation guide.

Why is this critical?

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