Dwyer TM2 - Manual (Page 4)

TIME UNIT FACTOR
FLOW UNIT FACTOR
If this all seems confusing, please note the following examples:
EXAMPLE ONE
A certain Model TF1032 Flo-Sensor is rated from 0.1-2.0 L/min.
The pulse output of the particular sensor is 274 PPS @ 2.0
L/min (each sensor will vary in pulse output). You want the
Model TM2 to display rate in mL/min. The formula would look
something like this:
EXAMPLE TWO
A certain Model TF1053 Flo-Sensor is rated from 1.0-10.0 L/min.
The pulse output of the particular sensor is 473 PPS @ 10.0
L/min (each sensor will vary in pulse output). However, you want
the Model TM2 to display rate in Gallons/min. The formula
should be used this way:
EXAMPLE THREE
A certain Model TF1062 Flo-Sensor is rated from 1-10 GPH. The
pulse output of that particular sensor is 347 PPS @ 10 GPH
(each sensor will vary in pulse output). However, you wish the
Model TM2 to display rate in mL/second. Use the formula like
this:
When you derive your particular Rate Multiplier using the
formula and/or examples above, write it down -- it will be entered
into screen #3 of the Model TM2 later.
Figuring the Totalizer Multiplier
The Totalizer Multiplier is the number that the Model TM2 uses
to interpret pulses into total flow accumulated. To determine this
factor, first convert the 100% flow rate of the Flo-Sensor (listed
in the manual of the Flo-Sensor) into the units in which you wish
the Model TM2 to display total flow. Use the following formula to
figure the Totalizer Multiplier:
100% Rated Flow New Flow Unit Factor
Pulse Output (PPS) Totalizer Time Factor
where 100% Rated Flow = 100% flow rate of Flo-Sensor,
where pulse output is given
(Ex: 2.0 L)
Pulse Output = Marked pulse output of sensor at
100% flow (PPS)
New Flow Unit Factor = see table on the left.
Totalizer Time Factor = see table below
TOTALIZER TIME FACTOR
If this seems complicated, take a look at these examples:
EXAMPLE ONE
A certain Model TF1032 Flo-Sensor is rated from 0.1-2.0 L/min.
The pulse output of that particular sensor is 274 PPS @ 2.0
L/min (each sensor will vary in pulse output). You want the
Model TM2 to display total flow in mL. The formula would look
something like this:
EXAMPLE TWO
A certain Model TF1053 Flo-Sensor is rated from 1.0-10.0 L/min.
The pulse output of the particular sensor is 347 PPS @ 10.0
L/min (each sensor will vary in pulse output). However, you want
the Model TM2 to display total flow in Gallons. The formula
should be used this way:
EXAMPLE THREE
A certain Model TF1062 Flo-Sensor is rated from 1-10 GPH. The
pulse output of that particular sensor is 347 PPS @ 10 GPH
(each sensor will vary in pulse output). However, you wish the
Model TM2 to display total flow in mL. Use the formula like this:
2 1000 1
1 1 274
= 7.299270
10 0.26418 1
1 1 473
X X = 0.005585
X X
10 3785.4 1
1 3600 473
X X
= 0.030303
X
Time Unit Sensor
was Calibrated For
minutes
hours
Totalizer Time Factor
60
3600
2 1000
274 60
= 0.1216545 X
10 0.26418
473 60
= 0.1216545 X
10 3785.4
347 3600
= 0.030303 X
Current Time Unit
minutes
minutes
minutes
minutes
hours
hours
hours
hours Desired Time Unit
seconds
minutes
hours
days
seconds
minutes
hours
days Factor
60.00
1.00
0.016667
0.0006944
3600.00
60.00
1.00
0.0416667
Current Time Unit
mL (milliliters)
mL
mL
mL
L(liters)
L
L
L
US Gallons
US Gallons
US Gallons
US Gallons Desired Time Unit
mL
L
US Gallons
Fluid Ounces
mL
L
US Gallons
Fluid Ounces
mL
L
US Gallons
Fluid Ounces Factor
1.000
0.0010
0.00026418
0.033814
1000.0
1.0000
0.26418
33.814
3785.4
3.7854
1.0000
128.0000
F-41-TM2:Model PHO-1 8/24/10 11:51 AM Page 4