MULTICAL® 302
74
Kamstrup A/S · Technical Description · 5512-1334_F1_GB_12.2016
14.3
Handling different test methods
14.3.1.1
Standing start/stop
Standing start/stop is a method used for testing the flow sensor’s accuracy. During the test the meter must be
mounted in a flow test stand. The flow through the sensor is cut off. Subsequently, water flow is added for a certain
period, during which the water passing through the sensor is collected. Having switched off the flow the volume of the
collected water is compared to the volume counted by the meter. In general, standing start/stop requires bigger test
volume than flying start/stop.
14.3.1.2
Standing start/stop via display reading
Condition: MULTICAL
®
302 must be in test mode (see paragraph 14.1.1).
The high-resolution display readings are updated at 4-second intervals.
14.3.1.3
Standing start/stop using pulse outputs
Condition: MULTICAL
®
302 must be in test mode (see paragraph 14.1.1).
Verification pulses are connected as described in paragraph 14.2.1 above.
14.3.1.4
Flying start/stop
Condition: MULTICAL
®
302 must be in test mode (see paragraph 14.1.1).
Verification pulses are connected as described in paragraph 14.2.1 above.
“Flying start/stop” is the most frequently used method for testing the accuracy of flow sensors. During the test the
meter must be mounted in a flow test stand and there is constant water flow through the sensor.
Verification pulses, as described in paragraph 14.2.1, can be directly used for the test stand if it is designed to control
the start/stop synchronisation. Alternatively, Pulse Tester, type 66-99-279, can be used as external start/stop pulse
counter.
As the meter calculates volume and energy every four seconds in test mode (see paragraph 14.1.1), the verification
pulses will also be updated every four seconds as described in paragraph 14.2.1. It is important to allow for this time
interval, which means that the test duration from start to stop must be so long that the update time does not influence
the measuring uncertainty to any very considerable extent.