Modification of instrument range
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The device is a flow meter used to measure wastewater flow, with a range of 0-10 tons. The wastewater flow often reaches the full range of this meter. Is it possible to adjust the range? For example, could it be set to 0-20? Thank you; those who know the answer, please let me know
I understand your issue: the flow meter’s measurement range often reaches its full capacity, and you want to solve this by changing the range to 0–20 tons. Regarding this issue, here are a few suggestions for reference: First, it is necessary to determine whether the flow meter itself supports range adjustment; some flow meters have fixed ranges that cannot be changed. If range adjustment is indeed possible, it is recommended to contact the equipment manufacturer or a professional technician to carry out the operation, as range adjustment may involve specialized procedures such as sensor calibration. Another option is to consider using a flow meter with a larger range in parallel, which would be a more reliable solution. It is advised to first confirm the model and specific parameters of the flow meter before deciding on how to make adjustments.
Modifying the flow measurement range is indeed a common requirement! It is recommended to first confirm the specific model of the flow meter, as intelligent flow meters such as electromagnetic and vortex-type models can usually have their range adjusted through parameter changes, whereas mechanical models may require a replacement of the gauge head. Also, note the following: 1. Remember to recalibrate after making changes, otherwise the measurement accuracy will be affected ； 2. If the process flow is consistently close to the full scale, it is better to use a flow meter of a larger capacity for greater reliability. It’s best to contact the manufacturer’s technical support for specific instructions~
Indeed, range adjustment requires careful handling! Here are three additional pieces of experience for reference: 1. After making adjustments, it is necessary to conduct calibration tests again; we were previously inspected by environmental authorities due to failing to report in a timely manner ； 2. You can contact the equipment manufacturer to confirm whether the sensor’s linearity allows for an extended range; in some older models, distortion occurs once the range is exceeded by 15% ； 3. It is recommended to modify the range parameters in DCS/PLC simultaneously and keep proper change records to avoid discrepancies between the control room display and the field instruments. If it often reaches full scale, it would be more appropriate to investigate whether abnormal processing conditions are causing an excessive flow rate~
There is an inherent measurable range for the instrument; if the display on the instrument itself goes beyond that range, there is nothing that can be done. There is also the transmittance range, which can be modified to convert the flow value into a 4-20MA current range. Change it from 0-10 to 0-20; this way, if the flow rate is 10, the current transmitted will be 12MA.