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E-HELP: Differential Temperature Measurement with Two RTDs

E-HELP: Differential Temperature Measurement with Two RTDs

Q: I am looking for a differential temperature transmitter. We have used the SPT in the past and know that it will work, but I don’t know if you can use two inputs of two different 4-wire RTDs with the SPT.

A: The SPT has only four input terminals; therefore the number of RTD wires is limited. For differential temperature one RTD can be a 3-wire and the other RTD can only be a 2-wire. The lead length compensation wire of the 3-wire connection compensates for the lead length of both RTDs. This is only useful if you make sure that all five wires have the identical resistance.

Published: June 16, 2015

E-HELP: Monitoring and Alarming on Critical HART Data with the HIM

E-HELP: Monitoring and Alarming on Critical HART Data with the HIM
Q: Is the SPA2 Limit Alarm Trip compatible with HART and can you pass HART through the unit? Our application is a control valve with a loss of signal cutout. We are using the SPA2 for this with position feedback via a Tri-Loop.

A: The SPA2 HLPRG model can be added to an existing HART loop without disrupting the existing HART communications on the loop. However, the optional analog output of the SPA2 will not contain any of the HART digital components so it won’t be useful for connecting to the Tri-Loop.

Published: June 15, 2015

E-HELP: Replacing a DCA With an SPA2

E-HELP: Replacing a DCA With an SPA2

Q: We have been using Moore Industries DCA series switches for some time. Is there a like-for-like digital microprocessor-based replacement available?

Published: June 5, 2015

E-HELP: Monitoring Gas Turbine Magnetic Pickup Frequencies

E-HELP: Monitoring Gas Turbine Magnetic Pickup Frequencies
Q: I am monitoring up to 13600 Hz from a magnetic pickup on a gas turbine for speed indication and would like to use the FDY Frequency-to-DC Converter. Can either the PRG or 10-250V input option handle this input frequency?
Published: May 20, 2015

E-HELP: Telling the Difference Between a Low Signal and a Lost Signal

E-HELP: Telling the Difference Between a Low Signal and a Lost Signal
Q: I have a question about the ECA-DIN Current and Voltage Alarm with the DH1L1 (Dual, High/Low, Failsafe) output option. The literature for the product says that "the failsafe relays are de-energized in an alarm condition or during power loss to the unit." Is this statement also true if there is a loss of input signal such as a broken wire?
Published: May 20, 2015
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