Hach CD500 Bedienungsanleitung Seite 18

Connect the compressed air cleaning
Use the integrated compressed air valve to make sure that measurements stop during the sensor
cleaning.
Note: Set the air pressure from 3 to 6 bar.
Note: Make sure that the length of the air hose from the compressor to the sensor is a maximum of 25 m (82 ft).
1. Connect the compressor to the compressed air inlet of the controller. Refer to
2. Connect the compressed air outlet to the compressed air nozzle of the sensor.
Operation
Configure the controller
Select Options in the navigation bar to set the general settings, measurements and cleaning
intervals.
1. Select System settings .
2. Select an option.
Option
General settings
Network settings
Automatic
measurements
Cleaning
Relay Control
18 English
Description
Select a language, set the system time and enter a password.
Set the IP address, subnet mask, gateway address and DNS server.
To enable an automatic measurement, select the box and set a measurement interval.
To save power, select the box "Sensor power down after measurement".
To measure a single sample, push Execute.
To enable the cleaning, select the box and set the parameters that follow:
• Measurement interval: 30 seconds to 1 day (default: 2 minutes)
• Cleaning interval: 30 seconds to 6 hours (default: 15 minutes)
• Cleaning duration: 5 to 20 seconds (default: 10 seconds)
• Pause before measurement: 5 seconds to 5 minutes (default: 5 seconds)
Select one of the options that follow for the cleaning system:
• Use valve: Selects the internal air supply valve of the instrument to control the
pressurized air supply to the sensor.
• Use relay: Selects and external device to supply the pressurized air to the sensor
(e.g., HOAB or HPA units).
To start a cleaning immediately, push Execute.
To enable the relay control, select the box and do the steps that follow:
1. Select MEASUREMENT VALUE USED and then NO INPUT VALUE SELECTED.
Select a measurement parameter of the connected sensors to associate to the relay.
2. Set the trigger level for the relay:
• Action level: sets the range of the measurement parameter where the relay
operates.
• Upper level: sets an alarm to occur when the measurement parameter is higher
than the set point value.
• Lower level: sets an alarm to occur when the measurement parameter is lower
than the set point value.
Figure 3 on page 9.