YOKOGAWA AXF series User Manual

IM 01E20D01-01E
4-6
4. WIRING
Connect the AXF integral flowmeter terminal to
external instruments, giving attention to the following
points. For F
OUNDATION Fieldbus protocol, please refer
to IM 01E20F02-01E. For PROFIBUS PA protocol,
please refer to IM 01E20F12-01E.
䊉 4 to 20 mA DC Current Output
Resistive load max. 750 Ω
Receiver
Instrument
AXF integral flowmeter
l+
l-
F0411.EPS
Communication
Resistive load
BRAIN
HART
250 to 450
Ω
250 to 600 Ω
Figure 4.1.10 4 to 20 mA DC Output Connection
䊉 Pulse Output
IMPORTANT
• As this is a transistor contact (insulated type),
give attention to proper voltage and polarity
when wiring.
• Do not apply a voltage larger than 30V DC or a
current larger than 0.2A in order to prevent
damage to the instrument.
• When input filter constant of the electronic
counter is large in relation to the pulse width,
the signal will decrease and the count will not
be accurate.
• If the input impedance of the electronic counter
is large, an induction noise from the power
supply may result in inaccurate counts. Use a
shield cable or sufficiently reduce the input
impedance of the electronic counter within the
magnetic flowmeter pulse output specification
range.
• The active pulse output (Optional code EM)
cannot be used in conjunction with the standard
pulse output.
• When the active pulse output (Optional code
EM) is selected, do not be short-circuit between
the DO+ and DO– terminals to avoid damaging
the instrument.
• When the active pulse output (Optional code
EM) is selected, the range of pulse rate must
be set to 2 pps maximum.
• To avoid communication (BRAIN/ HART)
failure, it is recommended to use the shield
cable.
NOTE
For pulse output from the DO terminals, param-
eters must be set. Refer to “Parameter Descrip-
tion” in the user’s manual of the AXF Integral
Flowmeter [Software Edition] (IM 01E20C02-
01E).
F0412.EPS
Mechanical Counter
Electronic Counter
Load
Protective diode
30V DC, 0.2A. max
PULSE OUT
PULSE OUT
AXF integral flowmeter
AXF integral flowmeter
DO+
DO-
DO+
DO-
Figure 4.1.11 Pulse Output Connection
F0413.EPS
Protective diode
PULSE OUT
DO+
DO-
DO+
DO-
Output voltage: 24 V DC 20%
Current: 150 mA or less
Pulse rate: 0.0001 to 2 pps
Pulse width: 20, 33, 50, 100 ms
Mechanical Counter
Electronic Counter
Load
PULSE OUT
AXF integral flowmeter
AXF integral flowmeter
Figure 4.1.12 Active Pulse Output Connection
(Optional code EM)

YOKOGAWA AXF series Specifications

General

Brand	YOKOGAWA
Model	AXF series
Category	Measuring Instruments
Language	English