UV Pure Technologies Hallett User manual

Instructions for the 4-20mA Unit
DO NOT REMOVE FRONT PANEL WITHOUT REVIEWING
INSTRUCTIONS FIRST. DAMAGE TO DISPLAY(S) MAY
RESULT.
Please read entire instruction before proceeding with
installation or operation of the 4-20mA unit.
4-20mA Unit / Unité / Unidad
Intensidad de los rayos ultravioleta
Transmisión neta de los rayos ultravioleta
UV Intensity
Intensité des rayons UV
Transmittance UV nette
Net UV Transmittance
On Board
4-20mA Option
Figure 1

4-20mA Option For Hallett 30
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Applications
The Crossfire Technology® embedded within the Hallett units (See Figure 3),
allows for both a UV Intensity and Net UV Transmittance (UVT) signal to be
provided. The 4-20mA option provides these two analog signals. It is a loop-
powered transmitter that can be used with any device that requires a 4-20mA
signal for logging purposes or for process control. The device is installed On
Board (see Figure 1) but used only for Hallett 30s.
Product Features
1. LCD Display - A 2.5” LCD display is a standard feature indicating both
input values and transmitted values –see Figure 1
2. UV Intensity Output –A signal proportional to the UV intensity of the
UV lamp is transmitted.
3. Net UV Transmittance (UVT) Output –A signal proportional to the
Net UV Transmittance of the water is transmitted.
4. Factory Calibrated –Both span and offsets are preset for immediate
field use.
5. Mounted On Board –The 4-20mA unit is typically installed within the
Hallett 30 unit with the display located on the front panel - see Figures
1 & 2.

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Specifications
Operating Range:
- 4-20mA loop output, 0-2.5Vdc input
Output Response Time:
- 1 second ††
Loop Voltage (supplied by others.
One power supply per loop or isolation
required between loops)
-10Vdc minimum, 35Vdc maximum
Operating Temperature Range:
- 40F to 100F, 5C to 40C
Load Resistance:
- Max. 650 @ 23 Volts, 35V
maximum
Electrical:
-reverse polarity protection
-over-voltage protection
Accuracy:
- 2% F.S. (full scale) for UV Intensity†
- 5% F.S. (full scale) for UVT†
Connections:
-Spring cage terminals for
output
† The accuracy depends on condition of Hallett unit. See Note on Net UV
Transmittance in Operation Section.
†† The display is updated every second however during a cleaning cycle of the
Hallett unit, the output is held steady. See Net UV Transmittance in Operation
Section.
Installation
The output connections for the 4-20mA transmitted signals are to be done on
the spring cage terminals located the end of the circuit board –See Figure 2.
Insert the wire into the terminal by pressing the lever forward. The output wires
can range from 14-26 AWG but usage of a shielded pair is recommended.
There is a knockout located on the bottom of the Hallett unit for cable entry.
There is also one #8 stud on the inside of the front cover to help secure signal
cable. To remove the Front cover for access to terminals, see last section of this
document.

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#8 STUD TO
SECURE SIGNAL
CABLE
BOTTOM LIP RESTS
AT CHASSIS WHEN
MOUNTED PROPERLY
UV INTENSITY
NET UV
TRANSMITTANCE
UV SENSOR ARRAY
- WATER +
- UVT +
- LAMP +
- UV +
Disconnect Ribbon Cable
- WATER +
- UVT +
- LAMP +
- UV +
SPRING CAGE
TERMINALS
WITH LEVER
PATCH CORD
4-20mA
CIRCUIT
BOARD
MAIN CIRCUIT BOARD
4-20mA Option
On Board
Lift Off Front Cover
KNOCKOUT
LOCATED
HERE
Figure 2

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Operation
Cross section of UV Chamber
Figure 4
Figure 3
UV Intensity
The input signal range of Lamp UV sensor is 0-2.5 Vdc. This value represents a
measurement of the UV intensity of the lamp. There are typical operating values
for a lamp for either a Drinking Water or Waste Water Application - see Chart 1.
Lamp UV
Sensor
Water UV
Sensor

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Lamp
Sensor
%
displayed
mA value
Lamp
Sensor
%
displayed
mA value
00.0% 4.0 00.0% 4.0
0.05 6.3% 5.0 0.02 5.0% 4.8
0.1 12.5% 6.0 0.04 10.0% 5.6
0.15 18.8% 7.0 0.06 15.0% 6.4
0.2 25.0% 8.0 0.08 20.0% 7.2
0.25 31.3% 9.0 0.1 25.0% 8.0
0.3 37.5% 10.0 0.12 30.0% 8.8
0.35 43.8% 11.0 0.14 35.0% 9.6
0.4 50.0% 12.0 0.16 40.0% 10.4
0.45 56.3% 13.0 0.18 45.0% 11.2
0.5 62.5% 14.0 0.2 50.0% 12.0
0.55 68.8% 15.0 0.22 55.0% 12.8
0.6 75.0% 16.0 0.24 60.0% 13.6
0.65 81.3% 17.0 0.26 65.0% 14.4
0.7 87.5% 18.0 0.28 70.0% 15.2
0.75 93.8% 19.0 0.3 75.0% 16.0
0.8 100% 20.0 0.32 80.0% 16.8
0.85 100% 20.0 0.34 85.0% 17.6
0.9 100% 20.0 0.36 90.0% 18.4
0.95 100% 20.0 0.38 95.0% 19.2
0.4 100% 20.0
0.42 100% 20.0
0.44 100% 20.0
Drinking Water Values
Waste Water Values
Chart 1
This value will be displayed on the bottom left hand side of the 4-20mA unit and
is updated every second. The transmitted value is normalized from 0-100% and
it is displayed on the bottom right hand of the 4-20mA unit. The 4-20mA signal
is directly proportional to 0-100%.
Upon startup of new lamps, this value will be low (less than 100%) until the
lamps reach full power. This may take several hours. After the initial burn in
time, new lamps may display a value higher than the 0.8 Vdc or 0.4 Vdc
depending on the application (up to 20% higher). This implies the UV lamp has
exceptional UV output and this is no cause for concern and the transmitted
output will continue to be 100%.
Accuracy is +/-2% of
Full Scale value

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Warning and Alarm set points
There are two set points for a UV intensity fault on the Hallett unit. The signal
must remain below the set point for at least 3-5 seconds before an alert is
issued.
A UV Intensity warning is indicated by the green LED on, the valve (if supplied)
remains open, the Hallett unit issues an audible alarm and flashes the red LED
beside lamp graphic. A UV Intensity warning will occur when UV intensity signal
drops below first set point –see Chart 2 for corresponding values for Drinking
Water and Waste Water applications.
A UV Intensity alarm is indicated by the green LED not on, the valve (if supplied)
closes, the Hallett unit issues an audible alarm and turns on solid the red LED
beside lamp graphic. A UV Intensity alarm will occur when UV intensity signal
drops below the second setpoint –see Chart 2 for corresponding values for
Drinking Water and Waste Water applications.
Lamp
Sensor
%
displayed
mA value
Lamp
Sensor
%
displayed
mA value
Alarm Setpoint 0.5 63% 14 0.24 60% 14
Warning Setpoint 0.55 69% 15 0.28 70% 15
Waste Water Values
Drinking Water Values
Chart 2
Net UV Transmittance
The input signal range of the Water UV sensor is 0-2.5 Vdc. This value
represents the UV Transmittance (UVT) of the water, the transmission of UV
through the quartz sleeve and the combined UV output from the right hand UV
lamp and reflector. With everything else constant, the net signal represents the
UVT of the water, thus the Net UVT. Accurate measurements of the Net UVT of
the water are based on a clean quartz sleeve. If the quartz cleanliness is not
100%, then the value displayed and transmitted will be somewhat lower that the
actual UVT.
For a typical Hallett system, the range of the Water UV sensor will be from 0.9
to 1.5 Vdc for a Drinking Water application, and from 0.4 to 1.1 Vdc for a Waste
Water application. This voltage value will be displayed on the top left hand side
of the 4-20mA unit. The transmitted value represents the Net UVT and it is a
calculated value based on both the maximum Water UV sensor value and the
Lamp UV sensor value –this method accounts for lamp aging (see note below
about the cleaning system and maximum Water UV sensor value). The NET
UVT is normalized from 0-100% and it is displayed on the top right hand side of
the 4-20mA unit - see Chart 3.

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Water Sensor % displayed mA value
*0.0% 4.0
*6.3% 5.0
*12.5% 6.0
*18.8% 7.0
*25.0% 8.0
*31.3% 9.0
*37.5% 10.0
*43.8% 11.0
*50.0% 12.0
*56.3% 13.0
*62.5% 14.0
*68.8% 15.0
*75.0% 16.0
*81.3% 17.0
*87.5% 18.0
*93.8% 19.0
*100% 20.0
Drinking Water & Waste Water Values
Chart 3
The accuracy is ± 5% within the range of 45-98% UV Transmittance.
Note, upon power up of the Hallett unit, the output will remain at zero for about
10-11 minutes. Afterwards, the display and transmitted value will be updated.
The Hallett units have an automatic quartz cleaning device which normally
activates for 5 minutes every 4 hours. It will also activate after a power
interruption or when the Water UV sensor value drops below the Lamp UV
sensor value. Since the wiper of the cleaning device passes through the field of
vision of the Water UV sensor, the value will vary (up to 0.6Vdc) as the wiper
turns at 1 rpm within the quartz sleeve. Only the maximum value recorded
during the wiping cycle is considered in the calculation of the UVT. The
transmitted value of the UVT is hence frozen and then finally updated after the
wiping cycle is completed (about 11 minutes from start of cycle).
To update the 4-20mA unit with a new maximum value within the normal 4 hour
period, press and hold the Reset button (hourglass symbol) on the front display
for 1 second. This will initiate a cleaning cycle and engage the wiper.
Another note is that when the wiper comes to rest, it will do so randomly as long
as the Water UV sensor value is greater than the Lamp UV sensor value (see
Alarm set point below). Therefore the Water UV sensor value displayed will be

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usually different than the one used in the calculation. To observe the maximum
value, initiate a cleaning cycle.
Water Quality Alarm set point
A Water Quality alarm is indicated by the green LED not on, the valve (if
supplied) closes, the Hallett unit issues an audible alarm and turns on solid the
red LED beside the water graphic. This occurs when the Water UV sensor value
drops below the Lamp UV sensor value continuously for 5 minutes. Since the
wiper causes the water sensor signal to fluctuate, only a continuously low signal
will cause an alarm. A continuously low signal represents a drop in UV
Transmittance below the 75% threshold for Drinking Water applications and 40-
50% threshold for Waste Water applications.
Spare parts List
Item
No.
Part Description
Drinking Water
Part No.
Waste Water
Part No.
1
Main Circuit Board –for 4-20mA
On Board Option
C100011S
C100017S
2
4-20mA Circuit Board (Rev B)
X100027N
X100050N
3
4-20mA Display
X100033
4
Display Pad (3 LEDs and Reset
button c/w green ribbon cable)
E100016
5
Patch Cord for 4-20mA On Board
Option (1.6ft-0.5m shielded)
150249

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INSTRUCTIONS FOR REMOVING FRONT PANEL
Please unplug the unit before starting. You will require a Philips screwdriver.
1. Begin by removing the front cover (with label & lights). This is
accomplished by first removing the 2 screws below holding the front
cover. Then remove the screw that secures the top cover. Remove the
top cover. Gently remove the front cover and hold it a couple of inches
off from the body –see Figure 4. You must disconnect a thin green
ribbon cable that powers the display lights –be careful not to
damage this. Reach in and disconnect the ribbon cable from the
circuit board by grabbing the end black connector (never pull on the
green cable itself). The front cover can then be moved a few more
inches away from the body.
Figure 4
2. The front cover can now gently hang on the lanyards provided.
3. The patch cord can be left in place or disconnected by pinching the clip
and pulling end out from the circuit board.
4. Proceed with wire installation, inspection or repair of unit as required.
5. When complete, replace the front cover by first installing the patch cord
(if required) .
6. Next, reconnect the 6-pin green ribbon cable to the port marked
‘DISPLAY’ (ensure the black connector is aligned properly and no pins
Inside of front cover
(behind display).
Grab end connector to remove cable.
Take care not damage ribbon
cable connecting the display to
circuit board!