Tecfluid MT-02 - Manual (Page 7)

Cod.:E-MI-2151001I Rev.: 2
7
we must apply the following correction:
Fn = Factor Pulses per litre ( new )
= ? (190,476)
F = Factor pulses per litre ( original ) = 200
V = Expected Volume = 100
Vr = Real Volume = 105
V
V x F
= F
r
n
In this case counting 200 pulses per litre for 100 litres (total of 20.000 pulses) we have been
given in fact 105 litres, thus we must decrease the value of pulses per litre to 190,476.
We must then calculate the reciprocal of this new value to introduce in the "L" mode.
Change of units of measurement
In some cases we need to change the measurement units for batching, for example, instead of
working in litres we need to work in kilograms. In this case we will need to know the density of the liquid
(
ρ).
To change from litres to kilos we must multiply the litres per pulse factor by the density of the
liquid to obtain the new factor for programming the MT-02. For example, if the liquid has a density of 0.9
and the flowmeter gives us 200 pulses per litre (0.005 litres/pulse) and we must batch in kilos; we will
program the MT-02 using 0.00450 as the new litres/pulse factor to be able to preset directly in kilos.
L
= Original Factor litres per pulse
Ln = New Factor litres per pulse
ρ = Density of the liquid in kg/litre
ρ
x L = L
n
6 TECHNICAL
CHARACTERISTICS
6.1 Power supply
The standard mains voltages for the MT-02 are 240 V, 220 V, 110 V, 24 V ac - 50/60 Hz. The
mains voltage must be specified on ordering.
On special order supply voltages of 12 or 24 V dc can be supplied.
The MT-02 consumes less than 2 W with ac mains supply.
6.2 Signal Inputs
The MT-02 is designed to accept three types of inputs; on ordering the type must be specified
given that there are differences between the two types.
1.
The type of input called "COVOL" is designed to work with an electrical contact which closes its
circuit between the terminals Nº1 and Nº2 of the input connector. Given that this type of input
tends to be very slow, and in order to avoid bounce effects of the contacts, the input frequency
is limited to about 200 pulses per second.
2.
The type of input called "TM-44" is designed to work with an inductive pick-up with a coil,
connected to terminals Nº2 and Nº3 of the input connector. The input frequency is limited to
about 1900 pulses per second.