Precision Flow Meter
Q: How long will the Precision Flow Meter’s battery stay charged?
A: A fully charged battery should provide 10 hours of continuous use.
Q: Does the Precision Flow Meter have a temperature limit, or range?
A: The meter is designed for use in ambient temperatures of -4 F to 125 F. It will accurately measure gas that has a temperature of -40 F to 200 F.
Q: How accurate is the Precision Flow Meter?
A: The accuracy is +/- 0.5% of Full Scale +/- 1% of reading with a turndown of 100 to 1 and resolution as much as 1000 to 1.
Q: What are the flow ranges for the pre-set calibrations and configuration on the Precision Flow Meter?
A: 2” SCH 80 PVC pipe is set up for 0-200 scfm.
3” SCH 80 PVC pipe is set up for 0-450 scfm.
4” SDR 17 HDPE pipe is set up for 0-700 scfm.
Q: What size pipe can the Precision Flow Meter accommodate?
A: The meter can provide flow measurements in pipes of 1” diameter or larger. The meter can be calibrated for specific pipe diameters. Most QED units will come with calibration for 2” SCH 80 PVC pipe and calibration for 4” HDPE SDR 17 pipe. In addition, the unit will have a configured channel for 3” SCH 80 PVC pipe. The 3” configuration uses the 4” pipe calibration and a “K” factor to produce the flow value.
Q: What is the largest pipe diameter the Precision Flow Meter can be used with?
A: Meters can be ordered with custom probe lengths to work in pipes up to 60” diameter. The standard QED Precision Flow Meter comes with a probe that will work in pipes up to 16” diameter with our compression fitting style access port. If a ball valve style access port is used, the probe will work in pipes up to 10” diameter.
Q: How do I know that my Precision Flow Meter is properly calibrated?
A: The Precision Flow Meter has a unique “Zero Flow Calibration Check” system. A zero flow milliwatt value for each meter is posted on the back of the meter. At any time, an operator can check this value against the value shown on the electronic display. The meter is properly calibrated if the 2 values are within 10 mWs of each other. For more details on how to perform this check, see the User’s Guide, O & M Manual, or the training video on QED’s website.
Q: Does the probe tip need to be positioned at a specific location within the pipe?
A: Yes, for an accurate measurement, the sensors must not only be located properly within the pipe diameter, but the sensor must also be oriented correctly with respect to the direction of flow. The probe is etched with “upstream” markings to help with this.
Q: Is the Precision Flow Meter UL rated, or does it have an intrinsically safe rating?
A: No. While we believe the meter would pass if tested, it has not been formally certified.
Q: What is the warranty on the Precision Flow Meter?
A: The meter comes with a 1-year warranty from the date it is shipped.
Q: What is the sensor made of, and does it need to be cleaned?
A: The probe sensors are reference-grade platinum RTD clad in a 316 stainless steel sheath. Cleaning can be done as needed, and consists of spraying the probe with DI water and wiping with a soft, clean cloth.