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the INTERFACE December 2010
In Which Applications Does the WORM Flexible Temperature Sensor Excel Due to its Inherent Design?
The original goal of the WORM® design was to provide a sensor that could be cut in the field to accommodate various size assemblies. Field experience has proven that its design helps with other obstacles as well:- Over time, wells accumulate dirt, mineral deposits and corrosion scaling on the inside. When you start with a 0.25" O.D. sensor and a 0.26" I.D. well and add debris, it makes it very difficult, or even impossible, to get the sensor in and out of the well. The WORM has an O.D. of 0.237" which allows it to more easily "slide past" debris.
- Wells installed horizontally have a tendency to sag with time and temperature. Removing and reinserting a rigid sensor can present challenges. The flexible design of the WORM permits it to slide into sagging wells.
- With a sheath length of only 1.5" long--instead of a long solid sheath of straight sensors -- the WORM provides response times 30 percent faster than straight sensors, giving it advantages where measurement speed is essential.
- The WORM's flexibility delivers enhanced durability in high vibration applications.
- Replacing failed straight sensors is easy and fast since the WORM slides right into an enclosure without having to remove assembly components.
Learn more about the WORM and watch our NEW VIDEO "Temperature Sensor Technology Demo Featuring Peter Welander and Moore Industries WORM" at www.miinet.com/theworm
HART-to-MODBUS RTU Protocol Conversion
Q: I have a Multivariable Mass Flow Transmitter. This device has HART protocol, but it is not sent over a 4-20mA signal. With this, we can't connect this instrument to our DCS I/O because our analog input modules read HART signals over 4-20mA. We are thinking that a solution could be to convert the transmitter's HART output signal to MODBUS RTU.A: Our model HCS HART-to-MODBUS Converter will perform this function. It acts as a HART Master and can read the HART variables in either single drop or multidrop HART loops. It monitors only the digital component of the HART signals. It maps Primary, Second, Third and Fourth HART variables to MODBUS RTU registers which can be read by a MODBUS RTU Master. The model HIM HART Loop Interface also monitors only the digital component of the HART signal. It can connect to a single drop HART loop. Depending on which model of HIM is specified, it can map the HART variables to two or three 4-20mA output signals or to a MODBUS RTU serial signal. Optional relay outputs can also be specified to indicate signal trip points or transmitter faults. Both the HCS and the HIM can also provide loop power (23V, 24mA) to the flow transmitter.
Learn More About HART Loop Monitors and Interfaces HERE.
Alarm Trips: The Ups and Downs
Something happens-a signal peaks or falls-and you need to know. A Limit Alarm Trip monitors a process signal (such as one representing temperature, pressure, level or flow) and compares it against a preset limit. If the process signal moves to an undesirable high or low condition, the Alarm Trip will trigger the response needed to maintain normal, and safe, operations. Independent "hard" alarm trips can be used to warn of trouble, provide on/off control or trigger an emergency shutdown.
Find out how by reading our white paper Alarm Trips: The Ups and Downs