The PIECAL 334Plus is supplying the loop voltage. There is a control loop error. This may be a transmitter (set for upscale burnout) with a bad or missing sensor, or a short in the loop.
Ground Leak Detected with Loop Diagnostics
Have you ever replace a “faulty” transmitter only to find the problem was somewhere else in the loop? And did you end up throwing the transmitter away after you fixed the other problem “just in case” the transmitter was faulty?
If you find a loop where the transmitter is calibrated correctly but all the readings elsewhere in the loop have a fixed offset, this is due to Zero Shift. This zero shift is typically caused by some current in the loop bypassing the transmitter. This might be caused by ground faults, moisture or corrosion.
If you have some loops that are erratic after it rains, there may be moisture present in a junction box where insulation has broken down. Turn on Ground Leak Detection and use the PIECAL 334Plus to power up the loop. Any current that isn’t controlled by the transmitter or other current control element will be indicated as leakage on the PIECAL 334Plus display.
The PIECAL 334Plus powers up the 2-Wire transmitter or loop and indicates the total current and the uncontrolled current. This provides information useful in troubleshooting loop errors.
Typical Error Conditions
The PIECAL 334Plus is supplying the loop voltage. A calibrated transmitter is limiting the loop current to 12.00mA. An additional 0.51 mA is not controlled by the transmitter and is leaking somewhere in the loop. Click on the link below to see a video demonstration of Loop Diagnostics in action.
Please contact +6221-5467618, +6221-54212399 or email [email protected]
Jalan Boulevard Raya Blok BA3 No.15 Gading Serpong Tangerang 15810, Jakarta, Indonesia
Fax : +6221-5467617
Email : [email protected]