The Fluke 789 ProcessMeter is an ultimate troubleshooting tool for electricians and instrumentation professionals, combining the functionality of a loop calibrator with the power of a digital multimeter. By equipping the 789 with a temperature measurement module 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.

Fluke 789

Since the launch of the Fluke Connect app, Fluke has heard from several customers about how Fluke Connect-enabled tools help get more done in less time. John Bohling, a service technician and member of Pipefitters Local 597 in Chicago, USA, recently shared some troubleshooting and preventive maintenance tips he collected.

Temperature module monitor temperature and electrical at the same time

John used the FC wireless K-Type temperature module for day-to-day troubleshooting applications. It measures temperature in one location and then wirelessly relays the results to a smart phone (with the Fluke Connect app installed). This comes in handy for checking multiple components of heating and cooling systems simultaneously.

For example, at one site, a temperature module was set up to monitor refrigerant line temperatures while he worked on the refrigeration 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 temperature 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 Connect dc voltage module I found that the building automation system was not sending the

proper ramp signal when duct static pressure dropped.”

This same FC module helped him find a chronic problem in a dc power supply that was intermittently dropping the 5 V dc it supplied. This caused the chiller to fail and trigger an alarm. He left the dc voltage module on the power supply overnight. “The results showed that the power supply dropped voltage and then restored itself. I replaced the power supply with confidence the next day,” John said. “These meters will be of incredible value as safety concerns rise and more tests need to be conducted outside of the electric panels and in more remote locations.”

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