Badger Meter Blancett B220-885, Руководство пользователя

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Installation
June 2021 SGN-UM-00282-EN-05 Page 6
INSTALLATION
Electrical Connections
The programmable K-factor scaler was designed to provide a field adjustable
frequency divider that converts the low level frequency output from a turbine
meter into a scaled square wave output signal See
Figure 2
below for the I/O
terminal connections
1
2
3
4
5
6
Signal
Input
Output
Output
Vin
Vin
Programming
Port
Internal 3.6k Ω
Pullup
Resistor Jumper
Figure 2: Input/Output terminal connections
Enclosure Mounting (Necessary for CSA Certification)
If the circuit board assembly is supplied without an enclosure, it must be mounted
in a certified Killark one-inch NPT model Y-3 conduit elbow outlet box to maintain
the CSA “Ordinary Locations” certification
Power
The K-factor scaler requires 8 5…30V DC to operate and is protected by a diode
See
Figure 2
for polarity
Turbine Meter
The turbine meter connections are non-polarized Use shielded twisted-pair wire
for this connection to the turbine meter
Pulse Output
Either the internal or external pullup resistor must be used for the K-factor scaler
to provide an output pulse This option is controlled by the onboard jumper With
the jumper installed, the internal pullup resistor is connected
Internal Pullup Resistor
The internal pullup resistor allows for simple installation Make sure that the
device being connected to by the pulse output can handle voltage levels as high
as the supply feeding the K-factor board And, make sure the output pulse from
the K-factor board can supply enough current for the receiving device to be able
to read the pulse The available current that the K-factor board can supply to the
receiving device can be calculated with the following equation:
Available Current =
(Input Voltage - 0.7V)
(3600Ω + 47Ω)
Verify that the receiving device input current requirement is below this value
for proper operation Otherwise, an external pullup resistor less than 3 6K must
be used