IS-HF-AccUViewLEDEx-100125 Rev 0
8
Measurements
This process monitor allows for the measurement of the transmittance
of process water online. Process water is usually reported in %T.
Readings above 102 %T are indicated by a flashing display. Readings
above 100 %T indicate that the current sample is better than the
calibration water. Readings above 110 %T are not possible. All
readings are path length corrected to 10mm.
Measurements can also be taken in Absorbance. Negative Absorbance
readings indicate the need for a calibration or that the water tested
is better than what the instrument was calibrated to. These readings
show ABS on the lower line of the display. All readings are path length
corrected to 10mm.
Warm-Up
The AccUView LED Ex requires a 30 minute warm-up period. To
improve the accuracy, allow the AccUView LED Ex to complete warm-
up time before calibrating. During the warm-up period, the display may
flash, indicating that it has detected a temperature change. This is
normal operation during the warm-up period.
Routine Measurement
1. Apply power to the instrument and allow the unit an initial warm up
of 30 minutes.
2. When a continuous process stream is flowing through the
instrument, the instrument will display the measured %T or ABS
level of the sample on the LCD screen. In addition, the equivalent
signal is provided on the analog (4-20 mA) output or the digital
output, depending on the options selected.
Initial Operation
Be sure that the cuvette is tightly installed on the flow through unit prior
to introducing water to the unit. The cuvettes are pressure checked at
the factory but could have loosened during shipping.
The instrument is factory calibrated. However, for the best accuracy,
the flow through cuvette should be locked in place and calibration
should be done with DI water. Refer to next section for complete
calibration instructions.
Instrument Calibration
The instrument is calibrated and tested prior to leaving the factory.
While it is possible to use the instrument directly out of the box, but for
the most accurate measurements, calibration is recommended before
initial use. Under normal conditions, recalibration is recommended at
least once a month. To get the greatest accuracy, calibrating once a
week may be necessary.
The two cuvettes supplied with the instrument may be exchanged with
one another. One cuvette should always be kept clean for replacement
when calibrating.
The instrument is designed to store the last reading prior to calibrating.
The 4-20 mA is held at this stored reading and will not change until
calibration is complete. 30 seconds after completion of the calibration
the AccUView LED Ex will start taking online measurements. These
measurements will be averaged with the stored reading (depending
on setting). In order to prevent disruptions in data, the operator should
release the clamp to allow the sample water to flush out the calibration
water as soon as calibration is complete.
While in calibration mode, the instrument has a time-out feature that
automatically returns the system operation to the AUTO mode after a
15-minute period of inactivity.
Calibration
1. Press the
MODE/EXIT
one time to enter calibration mode. The
arrow besides
CAL
will be illuminated. The lower display will show
alternating
with either
100
(indicating that 100%T standard is
selected) or
0
(indicating that 0.000ABS standard is selected).
Once entering calibration mode, the last reading is stored and the
equivalent reading is being output on the 4-20 mA signal. This
output will be held after the instrument returns to
AUTO
, allowing
time for the flow to be restarted.
2. Using the shutoff clamp, close off the flow of water.
3. Remove the flow through cuvette and retain for future use.
4. Fill the second clean cuvette with 100% T calibration fluid and
reinstall the filled cuvette tightly on the flow through unit.
5. Wipe flow through unit dry, install and lock in place.
6. Press the
button to start the calibration.
7. The upper display will count down the progress of the calibration
step. The instrument will return to
AUTO
mode at the end of the
calibration.
8. Release the shutoff clamp to restore sample flow.
DO NOT move
or remove flow through cuvette after calibrating.
The last reading before calibration may be displayed for at least 30
seconds after completing calibration. The length of time it takes to
show the current reading will depend on the response time and lamp
duty cycle settings.
There is no need to recalibrate when changing ranges from %T to ABS
or reverse.
A flashing display may occur after warm-up. This is an
indication that either the ambient or water temperature has
changed rapidly. During this time, the readings may be slightly
out of the specified accuracy. The AccUView LED Ex will
automatically compensate as soon as the rate of temperature
change slows.
NOTICE
Screen Display - Calibration Menu (100% T) Screen Display - Calibration Menu (0.000ABS)
CAUTION
!
The UV lamp is very low power but it is recommended to avoid
looking directly into the optical well while the flow through unit
is removed.
Arrow Indicates
Normal Operation
Measured
Reading
Measurement
Scale (%T or ABS)
Screen Display - Normal Operation
