PART TWO - INSTALLATION
SECTION 3 - ELECTRICAL CONNECTIONS
Accu4™ Low-range Turbidimeter System
Rev. 2-300
28
3.2 Analog Outputs
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3.3 Relay Outputs
Two isolated analog outputs (1 and 2) are provided. Each
output represents the measured turbidity, and can be set to
be 0/4-20 mA.
The outputs are isolated from the inputs
and earth ground, but not from each other.
For details on
configuring the outputs, refer to Part Three, Section 4.3.
Wiring Tip!
Use high quality, shielded instrumentation
cable for connecting the analog outputs. To protect the
output signal from EMI/RFI, connect cable shields to:
The grounding strip at bottom of case (5 open holes,
Fig. 2-8) for analyzers with “B” prefix serial number.
The “ground symbol” Terminal 1 on TB1 (Figure 2-9)
for analyzers with no letter prefix serial number.
Each 0/4-20 mA output can drive a load of up to 600 ohms.
•
Output 1:
Connect the load to Terminals 2 and 3 on TB1,
matching polarity as indicated.
•
Output 2:
Connect the load to Terminals 4 and 5 on TB1,
matching polarity as indicated.
NOTE:
When using the HART communication option, a
digital signal is encoded onto the 4-20 mA analog
Output 1 signal. In a HART SINGLE MODE wiring
configuration, Output 1 remains available for normal
use. However, in a HART MULTI-DROP wiring con-
figuration, Output 1 becomes dedicated to that
function and cannot be used. See Part Three, Sec-
tion 8 for more HART communication information.
The analyzer is equipped with four electromechanical re-
lays. For relay setup details, see Part Three, Section 4.4.
CAUTION:
DO NOT EXCEED THE CONTACT RATING FOR
EACH RELAY (5A 115/230 VAC). WHEN SWITCHING
LARGER CURRENTS, USE AN AUXILIARY RELAY
SWITCHED BY THE ANALYZER RELAY TO EXTEND
ANALYZER RELAY LIFE. WHEN USING RELAY
OUTPUTS, MAKE SURE THAT LINE POWER WIRING
CAN ADEQUATELY CONDUCT THE CURRENT
DRAW OF THE SWITCHED LOAD(S).
