Myron L 729II User Manual
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J. REMOTE ALARM - RA™
RA
Ordered as an accessory, includes 8” harness with
connector, and two (2) wire nuts.
1. DESCRIPTION
This remotely mounted AUDIBLE and VISUAL alarm con-
nects to any Myron L Company Monitor/controller, or brand “X”
controller with dry contacts. When activated by the controller the
Remote Alarm will provide both an audible and a visual alert at a
location other than at the controller.
A mute button will silence the piezo alarm for up to 10 minutes
while the LED remains illuminated. After the preset time the
piezo alarm will again sound, this will repeat until the water
quality is corrected. Thus allowing servicing of the system under
control, while still acting as a reminder if the problem has not
been corrected.
The Remote Alarm - RA™ is an inexpensive way to alert per-
sonnel of a trouble situation. For example; the Monitor/controller
may be located with an RO system while the service technicians
are on another floor or even in another building - great for hos-
pitals. The AUDIBLE alarm may be silenced, but stays in alarm
(RED LED is still illuminated) until the trouble is corrected. The
timer may be set from 15 seconds up to 10 minutes, thereby,
giving personnel the time to correct the problem while not being
able to ignore the trouble because of the reoccurring AUDIBLE
and VISUAL alerts.
Specifications
Audible Alert — Piezo Electric
Oscillating Frequency — 3.0±0.5KHz
Operating Voltage (750II) — 24VDC Nom.
(1.5-30VDC Max.)
Sound Pressure Level (Min) 30cm/12VDC — 80dB
Current consumption (Max) @ 12VDC — 12mA
Tone — Constant
Operating Temperature — -20 - +60°C
Size — 24 x 9.5 mm
Visual Alert — Bright RED LED
Time Delay — 15 seconds to 10 minutes (USER adjustable)
Power — 24VDC (supplied from Monitor/controller)
Case Material — ABS plastic
Dimensions — 4.75L x 2.56W x 1.56H (121L x 65W x 40H)
Mounting — Customer supplied screws
Operational Distance — Wire lengths of 500 feet (152 meters)
have been tested with no adverse effects
Additional Wire available, order RAW-200. — 200 feet (61 meters)
2. INSTALLATION
Briefly —
Only 2 wires to connect from the controller to the RA.
Set the time.
Mount on the wall or on the bench.
WARNING: BEFORE STARTING, IF MONITOR/
CONTROLLER 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.
The Remote Alarm - RA connector is labeled 24VDC INPUT and
has a 8” 2 conductor wires attached — Black is Positive (+) and
White is Negative (-).
When extending the wires you may use any two color wire you
wish just remember the polarity — Black is Positive (+) and
White is Negative (-). Wire lengths of 500 feet/152 meters have
been tested and have no adverse effect on performance although
a length of 500 feet/152 meters would be unusually long.
Ensure the unit is completely wired, tested and adjusted before
installing RA to mounting surface.
For OEM models skip steps referencing enclosure or front panel.
1. Run #22, 2 conductor speaker type wire, NOT
supplied, from Monitor/controller to RA location as
necessary. Wire may be ordered from the
Myron L Company, part #RAW-200.
2. Open the RA by removing the four (4) screws.
3. Locate and remove the 8” 2 conductor wire with the
reddish brown connector attached to the RA.
See figure III.J.1.
4. At the RA, connect the extension wires to the
connector on the RA circuit board — Black to Positive (+)
and White to Negative (-) as shown in figure III.J.1.
5. Using a standard slot screwdriver remove the two (2)
screws on the Myron L Monitor/controller front panel.
6. Carefully wiggle the front panel to loosen and pull
gently toward you. Do not pull more than about
8 inches/20CM or you could damage the wiring
harness.
7. Connect the extension wires to the 8” 2 conductor wire
with the wire nuts provided — Black to Positive (+) and
White to Negative (-). Be sure to first pass the wire
through the user supplied waterproof strain relief in the
enclosure.
8. Plug the reddish brown connector into the male connector
on the controller circuit board marked RA (see inside case
label or figure III.J.2 for location). It will only go on the
connector one way.
9. To test, simply turn ON the controller and adjust
controller set point until the alarm sounds off*. If
controller is not yet connected to water, on conductivity/
TDS controllers it will be necessary to press and hold the
Full Scale Test Switch. See figure III.J.2. The
black button on the front of the RA will mute the piezo
!
CAUTION - READ FOLLOWING CAREFULLY
RA CB ASSEMBLY
CONTROLLER
+ -
10
4
15
30
7
8
5
9
3
2
1
6
MIN
SEC
Figure III.J.1