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FW-E115-P-M_v0203_03_EN.docx
The automatic unit conversion can handle either volume or mass units. For measurement units
which are not supported, for example ‘revolutions’ or the use of volume and mass units
simultaneously, the automatic unit conversion can be set to ‘Hand’, allowing total and flowrate to be
configured independently.
Example: Calculating the K-factor.
To manually calculate the K-factor to enter for total or flowrate, follow this example:
Assume that the flowmeter generates 65.231 pulses per US gallon and the required measurement
unit is cubic foot / ft
3
. A cubic foot consists of 7.48052 gallon which implies 487.9618 pulses per
cubic feet. So, the K-Factor to enter is 487.9618.
The E115-P is able to handle several types of input signal. The type of
flowmeter pickup / signal A is selected with SETUP 6.1. The settings with LP
are used to apply a build-in low-pass filter. See also chapter 4.
The selections “Active pulse input” offer a pulse detection level of 50% of the
supply voltage.
NPN input with low pass
filter
(open collector)
less sensitive
Reed-switch input with
low pass filter
PNP input with low pass
filter
High sensitive coil input
Sensitive for
interference!
Active pulse input
detection level 3.9 Vdc
Active pulse input
detection level 11 Vdc
The secondary signal B is used to detect the direction of flow. In most
applications, the type of signal for input B will be the same type as the
main signal A (setting 6.1). For selection, read SETUP 6.1.
The secondary pulse input B of the E115 can be set to:
• disable: input B will be ignored; the unit will act as a normal
flowrate / totalizer.
• 90°: the phase difference between flow A and flow B is 90° and is
used to detect the flow-direction in the flowmeter.
• 270°: the phase difference between flow A and flow B is 270° and
is used to detect the flow-direction in the flowmeter.
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