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Process Control

Process Control
Dwyer sells alarm switch modules, chart recorders, current and particulate transformers/switches, data loggers, fan speed controllers, intrinsically safe barriers, indicating annunciators, motion/safety switches, power supplies and transformers, relays, signal conditioners/converters, SSR monitors, and more.

Questions

Question
What restrictions, if any, are imposed for the Magnehelic® and Photohelic® gages in vacuum service?
Answer
In applications involving higher vacuums than 20" Hg, leakage due to gage housing porosity becomes the limiting factor.
Question
The DPMA-502 panel meter, what is the environmental rating? NEMA 1?
Answer
The Series DPMA doesn't have a NEMA rating.
Question
What is the proper way to wrap the wire around the Current Transformer #CCT40-200?
Answer
If the current running through your wire is high enough to be detected by the model CCT you have, then you can simply single wrap it as you have shown in the attached PDF you provided. However, if the current is too low to be detected, then you would want to wrap the wire around until the current is high enough to be detected. Here is a link to the service manual for our Series SCT Current Transformer that explains this concept better, Series SCT Instruction Manual. See Figure 4.
Question
Is there a limit to the length of tubing used on the DCP100A pressure Module?
Answer
There is no limit to the length of tubing you connect to the DCP100A pressure module. It can be as long or as short as you need for your application. However, please note, that the longer you make the tubing, the longer the response time of the DCP100A will be.
Question
Question 1. What is the input impedance of the SPPM meter with voltage input? I'm replacing an old analog meter with a 0-100 uA movement with a more reliable digital panel meter. Question 2. The analog meter I want to replace has a two-range non-linear vibration scale 0-4 Grms and 1-10 Grms. Is it possible to create non-linear calibration curves for the SPPM?
Answer
The SPPM with the voltage input has a 10MΩ input impedance. Also, a non-linear calibration curve can be created by merely using the software in the SPPM. One can use the sensor linearization and use up to 20 calibration points and even have your results converted into a .csv file.