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Outputs
Using our example once again, if the flow rate is 150 l/s, 15 pulses would be required to represent it. Since the flow meter can
only generate 10 per second, the other 5 must held as an outstanding count. Since the flow meter can store up to 1000 outstanding
pulses, it can tolerate a flow rate of 150 litres/second for 1000/5=200 seconds before an error is generated. At some stage
however, the flow rate must drop below 100 litres per second for the outstanding pulse total to be diminished.
Determining a Suitable Volume per Pulse Value
How to calculate a suitable
1.Convert
Max. flow rate
Example
Max. flow rate = 2000 gallons per hour
Max. volume per second = Max. volume per hour (gallons per hour) / 3600
Max. volume per second = 2000/3600 = 0.555 gallons per second
Max. volume per second
Example
0.555 gallons per second
2,
Calculate Max. pulses per second from
Example
Pulse width = 25 ms
Max. Pulses per second = 500 /
Max. Pulse per second = 500 /
Energy Pulse (HM versions only)
Each pulse represents an amount of energy, for example 1kWh. With a limitation on the maximum pulse rate (as described in the
previous section) a larger unit of energy per pulse or a smaller pulse width may be required to represent the range of possible
values.
How to calculate a suitable
1.Convert
Max. power
(eg. BTU/h) to Max. energy per second
Example
Max. power = 15,000 BTU/h
Max. energy per second = Max. energy per hour (BTU/h) / 3600
Max. energy per second = 1500/3600 = 4.1666 BTU/s
Max. energy per second
Example
4.1666 BTU/s
2,
Calculate Max. pulses per second from
Example
Pulse width = 25 ms
Max. Pulses per second = 500 /
Max. Pulse per second = 500 /
46
Volume per pulse
value from
(eg. gallons per hour to Max. volume per second
Max. pulse per second
Example
20
Energy per pulse
value from
Max. pulses per second
Example
20
Maximum flow rate
and
3.
Calculate
Example
Calculated:
Rounded up to next digit:
Rounded up to next decade:
pulse width (ms)
Pulse width (ms)
25ms
= 20
Maximum power
and
Pulse width
3.
Calculate
Example
Calculated:
Rounded up to next digit:
Rounded up to next decade:
pulse width (ms)
Pulse width (ms)
25ms
= 20
Pulse width
(Imperial)
Volume per pulse
0.02777 gallons
0.03 gallons
0.1 gallons
(Imperial)
Energy per pulse
0.20833
0.3 BTU
1 BTU
Operating Instructions
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