Electricity + Control October 2018

round up PRESSURE + LEVEL MEASUREMENT + INSTRUMENTATION

Efficient troubleshooting and preventive maintenance

For example, at one site, a temperature module was set up to mon- itor refrigerant line temperatures while he worked on the refrig- eration components located elsewhere. He also used the K-type temperature module on split system-style chillers. In one instance the chiller, which had a microprocessor-based control, was located in the basement; the air-cooled condenser was located on the roof. John was able to oversee the fan-cycling controls by measuring the motor amp draw using the a3000 FC current clamp. At the same time, he monitored the liquid line tem- perature using the temperature module, and observed a specific percentage on the microprocessor in the basement. He viewed the results from all three tools simultaneously, in real time, on his smart phone. Finding a needle in a haystack With the Fluke Connect dc voltage module, John measured a 0-10 V dc signal to a variable frequency drive (VFD) located in a supply air cabinet. The third party panel was inaccessible so the VFD was the only place to test. “If I had tried to monitor the third-party signal at the VFD with a standard meter, it would have tripped an alarm due to ‘no proof of air flow’ by the air flow switch,” he said. “Using the Fluke Con- nect dc voltage module I found that the building automation system was not sending the proper ramp signal when duct static pressure dropped.” Enquiries: Comtest.Tel. +27 (0) 10 595 1821 or email sales@comtest.co.za Innovative compact orifice plate Compact orifice plates can be used without difficulty for the measurement of liquids, gases and vapours. WIKA’s new compact orifice plate Model FLC-CO enables direct mounting of differential transmitters. Differential pressure flow meters are used in many technical applications. As primary flow elements, orifice plates represent the most common solution. They are notable for their easy installation and management. The differential pressure generated by the

The Fluke 789 ProcessMeter is the ultimate troubleshooting tool for electricians and instrumentation professionals, combining the functionality of a loop calibrator with the power of a digital multim- eter. By equipping the 789 with a temperature measurement mod- ule and the wireless data logging capabilities of Fluke Connect™ with ShareLive™ video call (sold separately), process technicians can now do a lot more while carrying a lot less. And with its built-in, selectable 250 ohm HART ® resistor, it eliminates the need to carry a separate resistor.

Temperature Module Mon- itor temperature and electri- cal at the same time John used the FC Wireless K-TypeTemperature module for day-to-day troubleshooting ap- plications. It measures temper- ature in one location and then wirelessly relays the results to a smart phone (with the Fluke Connect app installed). This comes in very handy for checking multiple components of heating and cooling systems simultaneously.

primary flow element is normally transformed into an electrical signal proportional to the flow rate by a dif- ferential pressure transmitter. Compact orifice plates enable the sim- ple assembly of the measuring arrangement as a plug-and-play solution, through which significant cost savings can be achieved. Differential pressure transmitters and valve manifolds are attached via

compact pressure tappings, elim- inating the need for differential pressure lines. Enquiries:WIKA Instruments.

Tel +27 (0) 11 621 0000 or email sales.za@wika.com

40 Electricity + Control

OCTOBER 2018