Q. Do you have a temperature control solution for a batch process chamber we have?  We have a manufacturing process that uses a critical batch process chamber requiring an RTD that senses the temperature. When the process chamber is being used, we need to maintain temperature, so we have a secondary temperature monitor to help in case of a fail-over. To do this, I need to connect to our RTD that has dual 4-wire inputs and be able to switch from the primary to secondary if the primary is disconnected or fails.

A. You can use a  Moore Industries’ THZ³-DIN temperature transmitter to precisely control the temperature. The THZ³-DIN can accept two 3-wire RTDs and can be configured so that its 4-20mA analog output is configured for failover/backup. If the primary RTD fails or is disconnected, the THZ³ automatically switches to the secondary RTD, it gives you a HART^®alarm (and display an error if TDZ³ is used), and allows you to maintain the temperature measurement in the chamber.

You can use your existing 4-wire RTDs as 3-wire elements by taping off one of the leads. You will still have lead length compensation with the 3-wire RTDs as long as the leads are the similar length and have equal resistance.

The THZ3 can be configured by using a HART^® hand held configurator or with PACTware running on a PC. A CDROM is provided with the PACTware installation files and DTM for the THZ³ with the shipment of the device. The THZ3 data sheet, manual, HART^®DD, PACTware installation files, and the DTM are also available for download on Moore Industries site.

An easy-to-use yet robust Dual Input Smart HART^® Temperature Transmitter, the THZ³ configures quickly and easily to accept a direct signal input from a wide array of sensors and analog devices including 14 RTD types and direct millivolt sources. The THZ³ has dual sensor input for Backup and Failover Protection, Average and Differential measurement and Low or High Select. It also has advanced RFI/EMI protection and ambient temperature compensation that helps guard against environmental factors that can quickly degrade measurement accuracy. Built-in 20 bit input resolution delivers exceptional digital accuracy of ±0.1°C (±0.18°F) with all Pt RTDs and is HART^® 7 compliant with exception based reporting and dynamic variable mapping. There's even a High Availability Option that enables the user to select how the AO behaves when there is an input failure or out-of-range value detected by the transmitter that prevents nuisance alarms on startups.

Do you want more information? Download the data sheet. Or visit the catalog.

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