Watts HF scientific CLX- XT, Руководство пользователя

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CLX-XT (28652) Page 14
REV 5 (5/2020)
5.0 Operation
The CLX-XT TRO values are reported in m illi g rams per L iter (mg/L), or if preferred the
equivalent
P
arts
P
er
M
illion (PPM).
Readings above 10.00 mg/L are outside the range of this instrument. Although the CLX-
XT may display above 10.0 mg/L, these readings will not be within the stated accuracy.
As the reagents degrade due to aging, readings above 10.0 mg/L may decrease in value.
For the optional 0-15 mg/L range the reading mentioned above are extended to
15.00 mg/L (Catalog #28895).
5.1 Routine Measurement (No Control Options)
Using this model instrument the CLX-XT will continuously operate and provide one
reading every cycle. It is important to note that the only way to stop the instrument is by
manually placing the instrument in SERVICE mode. If the power is interrupted the
instrument will automatically start in the AUTO (cycle) mode.
First, ensure that all plumbing and electrical connections are complete before continuing.
The following steps describe how to measure the value of chlorine of a sample using this
instrument:
1.
Apply power to the instrument and allow the unit to warm up (typically 45 minutes to
one hour on initial commissioning).
2. When a continuous process stream is flowing through the instrument, the instrument
will display the measured chlorine level of the sample by displaying it on the LCD
screen. In addition, the equivalent signal is provided on the analog (4-20 mA) output,
or the digital (RS-485) output, depending on the options selected.
5.2 Routine Measurement (Modbus Control Option Cat# 25316)
Most versions of CLX-XT software allow Modbus control. Using this control the system
will provide one cycle and provide one updated reading each time it is prompted. It will
then go into standby mode and await another prompt.
First, ensure that all plumbing and electrical connections are complete before continuing.
The following steps describe how to measure the value of chlorine of a sample using this
instrument:
1. Apply power to the instrument. The instrument will perform a water calibration
(WCAL). This automatic calibration is necessary and will only be performed once on
power up.
2. When the instrument has completed the WCAL it will enter standby mode and is
ready to run a measurement cycle.
3. Subsequent measurement cycles must be initiated from Modbus using the Coil
Address 00005. The default is False (0). Setting this address to True (1) initiates the
cycle.
4. Each cycle will take about 60 seconds after which the reading screen will be updated.
The 4-20 mA and alarms will be representative of this reading.