Startup; Operation - Hach Accu4 User Manual

Note: If the keypad is not used within 30 minutes, except during calibration or while
specific controller Test/Maintenance functions are used, the display automatically
goes to the Measure screen.
From the Measure screen, push the RIGHT or LEFT arrow to toggle
between the two Measure screens. The second Measure screen is for
Service use only.
To adjust the display contrast, push and hold ENTER and
simultaneously push the UP or DOWN arrow while the Measure screen
shows.
Figure 13 Measure screen
1
1 Relay status
2
2 Turbidity reading
1
The relays that are energized show. For example, if Relay A and C are
energized, "RELAY: A C" shows. The relay status flashes when a relay
overfeed timer has expired.
2
If the reading is not within the measurement range of the controller, a series of
"+" or "–" shows.
3
Push the DOWN arrow to see the Analog Output 2 value (mA).
18 English
3
3 Analog Output 1 value (mA)

Startup

Select the language
Select the display language (default = English).
1. Push MENU and select CONFIGURE>LANGUAGE.
2. Use the UP and DOWN arrows to select the language.
3. Push ENTER.
Start the flow
Start the flow of sample through the flow chamber.
1. Turn the 3-way valve handle of the sensor to the OPERATE position.
2. If the recommended isolation valve is used downstream of the
sensor outlet, open the isolation valve slowly to start the flow.
3. Measure the flow at the outlet. Make sure that the flow is within the
flow range shown in Specifications

Operation

Configuration
Configure the sensor
1. Push MENU and select CONFIGURE>SENSOR.
2. Select an option.
Option Description
SELECT Select the measurement units shown—NTU (default), TEF,
UNITS FNU or FTU.
SET FILTER Set the amount of time for measurement averaging—0 to
60 seconds (30 seconds = default).
For example, if the value is set to 30 seconds, the turbidity
value shown is updated every 30 seconds and the value is
the average of the turbidity values during the previous
30 seconds.
on page 3.