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22
S A G E M E T E R I N G , I N C .
24 VDC Rio Remote Terminals (Series SRX)
(APPROVED FOR HAZARDOUS SERVICE
INSIDE COVER VIEW
E X T E R N A L LY P O W E R E D
4 – 2 0 m A B Y C U S TO M E R
C U S TO M E R
R E T U R N
*B4 and B5 JUMPER
Remove jumper for Externally Sourced 4-20
mA. In this mode, user supplies 9-27 Volts to
externally power the 4-20 mA loop, and the
4-20 mA loop becomes optically isolated.
On units with HART this jumper has been
removed at the factory.
**Along with removing B4 & B5 Jumpers, it
is necessary to connect C4 Resistive Jumper
to Terminal B3 instead of C6. Note, B3 must
be connected to the External Sources com-
mon in order to enable the optically isolated
Pulse Output. In this mode, Pulse Output is
optically isolated. Pulsed Output voltage will
depend on customer source voltage. Use
Sage Resistive Jumper only!
NOTE: The Sage 24 VDC Rio
draws 2.4 watts maximum
(i.e. ≅ 100ma @24VDC)
1 Specify the Sage Rio PLUS option in order to have the Modbus Ground (Terminal C1, COM) isolated
from the 24 VDC Sage Power Supply Ground (Terminal B6). All other features of Rio PLUS are identi-
cal to the standard Sage Rio, except other voltage available. ( ee footnote 8)
2 It is important to connect the Ground when using Modbus communications, or ground loop problems
may develop. Improper wiring can also damage internal circuitry
3 ote, if customer externally powers the 4-20 mA by removing the jumper, the Pulse voltage output
is also effected: The voltage output of the Pulse will follow the customer power (i.e. 24 VDC external
power will result in a 24 VDC Pulse [maximum of 50 mA]; 12 VDC external power will result in a
12 VDC Pulse)
4 Pulse width 250 msec default (adjustable with Addresser software)
5 Using HART or Sage Addresser, a Low Flow Cutoff (LFC), commonly referred to as Min Cutoff or Zero
6
)
A1 – RED – VELOCITY SENSOR WIRE (HEATED ELEMENT)
A2 – GREEN – SENSE WIRE
Grounding
A3 – BLUE – VELOCITY SENSOR WIRE (HEATED ELEMENT)
Lug
A4 – WHITE – TEMPERATURE SENSOR WIRE
A5 – BLACK – SENSE WIRE
A6 – ORANGE – TEMPERATURE SENSOR WIRE
* *
B3 – JUNCTION FOR ISOLATED PULSE
B4 – 4-20 mA RETURN (–) AND PULSE SOURCE
*
B5 – VDC IN – VOLTAGE DC – POSITIVE (+)
B6 – VDC GND – VOLTAGE DC – GROUND (–)
C1 – COM – RS485 MODBUS GROUND
C2 – B(+)–RS485_D1
C3 – A(–)–RS485_D0
+
* *
C4 – 24 VDC PULSE – 0 TO 24 VDC PULSE OUTPUT
–
+
C5 – 4-20 mA – 4 TO 20 mA SIGNAL DRIVE
C6 – VDC GND – VOLTAGE DC – GROUND (–)
DESCRIPTION
DC Input Power:
24 VDC
7,8
Internally Powered:
4-20 mA
Internally Powered:
Pulsed Output
Externally Powered:
4-20 mA
Externally Powered
Pulsed Output
MODBUS
O p e r a t i o n s a n d I n s t r u c t i o n M a n u a l
1
1,2
5
TERMINALS
B5
B6
+ VDC
– VDC GND
C5
C6
4-20 mA
Return
SIGNAL DRIVE
C4
C6
24
GND
O
C5
B4
4-20 mA
4-20 mA
SIGNAL DRIVE
EXTERNAL SOURCE
9
:
C4
B3
24
JUNCTION FOR
PULSE RETURN
O
C2
C3
RS485(+)
RS485(–)
Cutoff can be entered into the FLOW MIN Functions. In Versions 1.82 or higher, the Low Flow Cutoff
and the 4-20 mA Scaling are independent of each other. For example: A Low Flow Cutoff (LFC) of
10 SCFM on a Meter with a Full Scale of 100 SCFM will report 0 on the Display and 4 mA on the
output. The output will remain at 4 mA until the LFC is exceeded: (ie: 25 SCFM=8 mA). Thus the
4 mA will always be zero based
6 ATEX II2G, Ex d IIB+H2 T6 Gb
7 24 VDC ±10%
8 Other DC voltages (5 VDC, 12 VDC, 48 VDC) available on Rio PLUS. Contact Sage
9 Assumes the 4-20 mA is Externally Powered
10 Modbus Ground becomes isolated from the B6 Power Supply Ground only on Rio PLUS version
(specify "PLUS")
(ONE ON EACH SIDE)
DISPLAY VIEW
3,4
3/4" NPT for
Remote Cable
(on Remote Style SRX)
NOTES
Do not remove
any Jumpers
Do not remove
any Jumpers
Remove B4 & B5
Jumper
Remove B4 & B5
Jumpers and Connect
C4 Resistive Jumper
to B3
C1
Modbus Ground
MODBUS GROUND
REQ'D)
3/4" NPT
User Entry
for Wiring
10
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