Yokogawa 212 Heat Calculator - Manual (Page 52)

6. INPUT & OUTPUT
CONNECTIONS
6.1 FLOWMETER INPUT
The instrument will accept frequency or pulse inputs from a wide range of
flowmeters.
Examples of connection diagrams are shown on the following pages.
Note that it may be necessary to change the position of the links as shown. These
links are accessible by removing the front panel as detailed in section 7.2 and the
link positions are shown in the drawing in section 7.3.
Link 1 Links in an input filter for a reed switch. The
maximum input frequency is approximately 500Hz
with this filter.
Link 2 Link for coils (eg. turbine or paddlewheel flow
sensors).
Link 3 Not connected. This position is selected if links 1 or 2
are not required.
Link 6 Selects a two wire proximity switch when in position
B.
Link 7 Selects a coil input when in position B.
The links are made via small black caps which fit over the two connecting posts
thereby creating the link.
The input on terminals 10 or 11 is limited to 30 volts maximum.
Note: After connecting the flowmeter, it is also necessary to program the
flowmeter factor. This is supplied by the flowmeter manufacturer and
represents the number of pulses per litre, m3, gallon or ft3 that the
flowmeter outputs for each unit of volume. It is often referred to as the
K-factor.
50 Input & Output Connections