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Frequently Asked Questions - Process Analyzers
  • I need to record my process variables. Do your analyzers do that?
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    • All of our analyzers & transmitters have 4-20 mA proportional outputs. This signal can be sent to a chart recorder, video graphic recorder or data logger that will record the data. We have a variety of recorders & loggers available in the Chart & Data section in our catalog!
  • I have an analyzer that’s not in the catalog, do you have the sensor for it?
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    • Call Tech Support! If your analyzer or transmitter is a brand that we carry, then we can order a sensor. If it’s not a brand we carry, we‘ll probably have to send you to that manufacturer’s rep, but please call tech Support just to be sure!
      pH is often an exception. You may be able to substitute a USABlueBook brand probe with your analyzer. Just like a lab probe, you have to match Temperature elements, but we stock a variety of combination & differential probes designed to substitute for those expensive brand name sensors!
  • I need to control a blower motor to maintain my DO level. Can your analyzers do that?
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    • All of our DO analyzers provide a 4-20 mA proportional output signal. This signal can be sent to a compatible Variable Frequency Drive to control the speed of the blower motor. Many plants are realizing big savings on their utility bills with this efficient control method!
  • Before I buy, I want to talk to one of your customers that is already using one of these. Will you give me a name & number?
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    • Although we don‘t supply product references, we completely stand behind all of the products in our catalog. If you’re not sure which unit fits your application best, please call our Tech Support & get their advice before you buy. The descriptions in the catalog are accurate, and you can review the complete specs & manuals on our web site to insure the unit will meet your needs. If necessary, we will expedite warranty repairs, or replace the product within 30 days if it’s bad out of the box.
  • I need to have an alarm go off if the Chlorine gets too low, can this analyzer do that?
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    • All of our Chlorine analyzers have at least one relay with a programmable set point. You can run the power for the alarm through the relay, or use an outboard control voltage. Either way, the analyzer will activate your high (or low) alarm. Always check the spec box on our catalog page to see how many relays an analyzer has.
      All of our products labeled “Analyzer” have at least one relay & at least one 4-20 mA output. Some of our lower cost pH, conductivity, & DO “Transmitters” only provide a 4-20 mA signal (sometimes that’s all you need!) Always check the spec box on our catalog page. Call tech support if you’re not sure!
  • I need to control my chemical feed pump to keep my pH in range. Which analyzer should I use?
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    • The best way to operate a chemical feed pump is to use a 4-20 mA signal to control the pump’s speed. The farther away from the set point the process is, the faster the pump runs. As the process approaches the set point, the pump slows down. All of our products labeled “Analyzer” have at least one 4-20 mA output. This output can be scaled to control an Acid or Caustic pump. Or, two 4-20 mA signals can control two pumps. This method provides the most efficient use of your process chemicals & often saves big money over an on/off relay system!
      If your chemical feed pump won’t accept a 4-20 mA signal, you can switch it on & off with a relay. As your process pH moves above (or below) the set point, the relay will turn on the Acid (or Caustic) pump. Two relays can control two pumps.