Posts Tagged siemens sitrans

A “So What” review of Siemens new SITRANS LUT400 ultrasonic level controller

Part of my job as the technical specialist at Lesman is to make sense of new products and upgrades, and figure out what’s really going to matter most to our customers.

Sometimes it’s just a matter of a much-needed new functionality, or better configuration tools, easier mounting, or switching to the most current form of data storage.

In the case of Siemens’ latest ultrasonic controller, it’s all that and more.

Siemens SITRANS LUT400 Ultrasonic Level ControllerSiemens (and Milltronics) ultrasonic controllers and transceivers, like the HydroRanger, MultiRanger, and OCM-III have been around for years with no significant improvements. Instead of updating these devices, Siemens has done a complete redesign, and introduces the SITRANS LUT400 as the first device in the new ultrasonic controller family.

Here are my initial thoughts on this new player in the ultrasonic game.

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Why doesn’t my LR560 radar’s analog output match the displayed level value?

Siemens SITRANS LR560 radar level transmitterA customer who had had lots of experience with Milltronics and Siemens ultrasonics was installing his first SITRANS LR560 radar level transmitter.  They had worked with it in the shop beforehand, going through most of the settings.  They even tested it by setting it up to shoot against a file cabinet and used a tape measure the check the indicated distance value.

Everything checked out OK in the shop.

When they installed the transmitter on the top of the bin, they changed the transmitter’s sensor mode parameter from the distance mode they used in the shop for testing to level mode.  After aiming, the level value shown in the local display was dead nuts on, but the 4-20mA signal going back to the control room was way off.

The bin was a third full. The 4-20mA showed it about double that.  Not only that, the 4-20 was going in the wrong direction.  The bin was emptying and the HMI reported an increasing level value.  Someone realized that an inverse-acting output was typical of a distance value, so they reconfigured the sensor mode to distanceThat got the 4-20mA much closer to a distance value, but it was still not exactly what it should be, and besides, the goal was to read level, not distance, in the control room.  What was going on?

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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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How do I set upper range value and lower range value on a Siemens pressure transmitter?

A customer needed to re-range a Siemens SITRANS P DS III transmitter without applying pressure. He’d read my earlier blog post about using the pushbuttons to program the DS III (Pressure Transmitter Pushbuttons to the Rescue!), and where to find the Z-fold instruction sheet.

All was going to plan, until he started looking for the settings for lower range value (LRV) and upper range value (URV). And then, in an all-too-familiar scenario, he hit a roadblock. The instructions don’t actually mention URV and LRV, the terms he’s familiar with, by name or acronym. So what’s a guy to do?

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February 2: A day to look back

Yesterday and today, people all over Chicago and the Midwest were looking at pictures from last year. We had 22″ of snowfall in one day. The roads were closed. The airports were closed. Even the Lesman offices were closed. And today’s weather forecast? 45°… in Chicago… in February.

This morning in Pennsylvania, a groundhog named Phil came out, looked back, and saw… his shadow.

All this looking back made me a little reflective myself. I’ve been writing this blog for about 6 months now. So I thought I’d take a minute and recap the articles people keep coming back to read:

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