Myron-l Aquaswitch II User Manual Page 23
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III. OPTIONS &
ACCESSORIES
A. 4A/4AO MODULE (4-20mA OPTION)
-4A 4-20mA Self/Remote-powered Isolated output module
ordered with Monitor/controller.
4AO 4-20mA Self/Remote-powered Isolated output module
ordered separately (includes harness).
1. DESCRIPTION
The 4-20mA option gives the AQUASWITCH II
Monitor/controller the ability to send a signal very long distances
with minimal interferences and signal degradation. The output is
an Isolated 4-20mA signal that corresponds to the full scale range
of the Monitor/controller into which it is installed. This output is
easily configured to be either self-powered or remote-powered as
required for your particular application.
NOTE: The maximum impedance of the user's current input
instrument should not exceed 600 ohms.
Since the output is an isolated current loop, it is the ideal choice
for applications requiring; a control signal to be run very long
distances, systems requiring a 4-20mA input or in instances
where isolation is necessary.
As the output is isolated, and a current, it is useful for long
distance interface, especially where wiring resistances may be
high, and/or the ground potentials may differ between the sensor
input ground and the current receiving instruments ground.
The 4-20mA output will not be degraded in accuracy even when
the ground differences are as much as 120VAC @ 60Hz.
Interface wire resistance of 350Ω will not degrade the accuracy of
the output when interfaced to a typical 250Ω input impedance of a
transmitter current input device.
The output is capable of driving a minimum of 600Ω worse case,
therefore, will satisfy virtually all modern interface requirements.
Current input devices usually have an input impedance of 250Ω,
however, some older designs can have as high as 500Ω or as low
as 10Ω. This “-4A” option will drive any impedance from 0 to 600Ω
without any degradation of performance.
There are two modes in which current loop transmitters operate;
Self-Powered and Remote-Powered.
Self-Powered — the transmitter provides the power to drive
the 4 to 20 mA current. See figure III.A.1.
Remote-powered — the receiving instrument provides the
power to drive the 4 to 20 mA current. See figure III.A.2.
Specifications
Self-Powered and Remote-Powered
Drive Impedance — 0 to 600Ω
Common Mode Maximum — 120VAC @ 60 Hz
Isolation — 100pf max. to Model 750II circuit common
100pf max. to input power line
Calibration
Two multi-turn pots — Factory Set.
4mA = Zero (0)
20mA = Full Scale
Calibration is NOT required. However, if you feel you must verify
or recalibrate, see Recalibration below.
2. INSTALLATION
Briefly -
The 4-20 Module replaces the plastic display retainer plate
attached to the front panel.
The 4-20 Module harness is attached to the main circuit board as
marked ‘4-20’. See figure III.A.4.
The 4-20 output is wired as required - Self-powered or Remote-
powered. See figures III.B.1 & III.A.2.
!
CAUTION - READ FOLLOWING CAREFULLY
WARNING: BEFORE STARTING, IF THE
AQUASWITCH IS INSTALLED, ENSURE THE POWER
IS OFF. FAILURE TO DO SO COULD CAUSE DAMAGE
TO THE INSTRUMENT, AND COULD BE HARMFUL OR
FATAL TO PERSONNEL. ONLY QUALIFIED
PERSONNEL SHOULD INSTALL ELECTRICAL
EQUIPMENT.
20
Figure III.A.1
CURRENT INPUT INSTRUMENT
Self - Powered
(+)
(-)
+
-
(+) SIGNAL OUT
POWER OUT
POWER IN
+
N
Figure III.A.2
CURRENT INPUT INSTRUMENT
Remote - Powered
(+)
(-)
+
-
(+) SIGNAL OUT
POWER OUT
POWER IN
+
+ 35 VDC
MAXIMUM
N
4A (4-20mA) Wiring Options
SO PO PISO PO PI
- AQUASWITCH I 1
- AQUASWITCH II 1
- AQUASWITCH I & II™ 2
- QUICK REFERENCE GUIDE! 2
- 21 may 03 3
- AQUASWITCH II™ 4
- AQUASWITCH I™ 4
- TABLE OF CONTENTS 5
- TABLE OF CONTENTS Continued 6
- I. INTRODUCTION 7
- DOUBLE INSULATED 8
- II. INSTALLATION 12
- Figure II.D.2 14
- Figure II.E.2 15
- AQUASWITCH™ 15
- POWER BOARD 15
- Figure II.E.1 15
- Figure II.E.4 16
- Solder ends together 16
- Figure II.E.3 16
- BK WT RD GN NU R- R+ 17
- TRANSFORMER 19
- REAR VIEW 20
- Figure II.E.14 20
- Figure II.E.13 20
- Figure II.E.12 20
- MYRON L 22
- III. OPTIONS & 23
- ACCESSORIES 23
- 4A/4AO - 4-20mA MODULE 24
- (+) SIGNAL OUT 24
- SO PO PISO PO PI 26
- WATER QUALITY 27
- BR BL OR - + 29
- Figure III.C.6 31
- Figure III.C.7 31
- FRONT PANEL DISPLAY 31
- Figure III.C.5 31
- + - 10 33
- IV. OPERATING PROCEDURES 35
- JUMPER CONVERSION 36
- Figure IV.B.1 36
- CONDUCTIVITY/TDS 36
- RESISTIVITY 36
- V. COMPONENT IDENTIFICATION 38
- Figure V.B.1 39
- Figure V.C.1 39
- Figure V.A.2 39
- CHASSIS GROUND for 41
- OEM INSTALLATIONS ONLY 41
- VI. OPTIONS & ACCESSORIES 43
- VII. REPLACEMENT PARTS 45
- VIII. LIMITED WARRANTY 46
- IX. GLOSSARY 47
- X. NOTES 48
- XI. ADDENDUM 49
- XI. ADDENDUM Continued 50
- Water Quality Instrumentation 51
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