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E-HELP: Replacing Temperature Transmitters With Changing Power Sources

E-HELP: Replacing Temperature Transmitters With Changing Power Sources
Q: I want to replace a THZ Temperature Transmitter (Model THZ/PRG/4-20MA/12-42DC [DIN]) with a CPT PC-Programmable Temperature Transmitter (Model CPT/TPRG/0-20MA/117AC/-C-RF [DIN]). The THZ unit we are replacing gets its power from the 4-20mA current loop while the CPT unit is going to be powered by 120Vac. Does the CPT need to be specified as "source" or "sink" to work as a drop-in replacement for the THZ unit?
Published: October 30, 2015

E-HELP: Configuring the STA for Multiple Pressure Levels

E-HELP: Configuring the STA for Multiple Pressure Levels
Q: I need to use the STA Safety Trip Alarm in a hardwired panel. Is it possible to configure two different levels of alarm for each of two relays in the STA, in order to have two different trips (one for each relay)?
Published: October 21, 2015

E-HELP: Converting a 4-20mA Logarithmic Signal Into a 4-20mA Linear Signal

E-HELP: Converting a 4-20mA Logarithmic Signal Into a 4-20mA Linear Signal
Q: We are in need of a signal converter that converts a 4-20mA logarithmic signal into a 4-20mA linear signal. We need one input and one output per device. Do any of your devices perform this function?
Published: October 13, 2015

E-HELP: Isolating Feedback on VFDs

E-HELP: Isolating Feedback on VFDs
Q: We are a boiler/burner company dealing with a rising amount of computer-based burner controls. We have installed several and have some blowers that are controlled by VFDs (Variable Frequency Drives). We have run into issues with noise on certain systems. We get occasional problems with 4-20mA feedback from the VFD despite going through the proper grounding techniques. We are wondering if installing an opto isolator on the feedback loop might eliminate our issue. We have used the SIX Signal Isolator many times on the signal going to the VFD to offset impedance issues on the VFD. Can we put an opto isolator on both signals?
Published: October 9, 2015

E-HELP: Using the CPA to Create a Temperature Switch

E-HELP: Using the CPA to Create a Temperature Switch
Q: I am looking for a device to create a temperature switch. I currently use a simple temperature switch with a 230°F setting, but at times the temperature of the unit goes over 400°F briefly and destroys the switch. I need to be able to hook a thermocouple up to the device and program a setpoint (with no display required) and have a set of dry contacts open when the temperature rises above the setpoint.
Published: September 18, 2015
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