Hach Ultra MET ONE 237AB, User Manual, Page: 19 / 57

16
Operation
5.2 Setup
The MET ONE 237 particle counter is ready to use when unpacked, but make sure that
the red sensor inlet cap is removed and the isokinetic probe is attached prior to sampling
(refer to
section 3.2.1 on page 10 ). If the RH/T probe is used, attach it before the counter
is turned on.
5.3 Counting modes
The MET ONE 237 particle counter exhibits various counting modes—Manual mode,
Automatic mode, Concentration mode and Beep mode.
5.3.1 Manual mode
Note: The factory default setting for the counting mode is the Manual mode.
5.3.1.1 Factory default settings
Table 2 lists the default parameters that are programmed at the factory. The MET ONE
237 particle counter exhibits various counting modes. The factory default setting for the
counting mode will be the Manual mode..
DIFF Helps to operate the different settings of the counter.
SELECT
Helps to select the different settings of the counter. This is used to set the date and time,
enable the printer, change the sample period, set the alarm limits, set the number of
sampling cycles and so on.
PROG
Helps to program the different settings of the counter. This is used to program the date
and time, enable the printer, change the sample period, set the alarm limits, set the
number of sampling cycles and so on.
UP
arrow
This is an adjustment key and it helps to navigate up in the choices available. It helps
scroll through the different sizes, the counter is programmed to monitor and view the
cumulative count in each size channel.
DOWN
arrow
This is an adjustment key and it helps to navigate down in the choices available. It helps
scroll through the different sizes, the counter is programmed to monitor and view the
cumulative count in each size channel.
MODE
Helps navigate and select the different counting modes of the counter.
Table 1 Indicators and key features or functions (continued)
Key Name Description
Table 2 Default parameter settings
Parameter Setting
Location number 000
Count mode Manual (the counter will take one sample and stop counting)
Alarm limits 0 (no particle count level alarms will be registered)
Channel 2 particle size 0.7 m in 227A; 0.5 m in 227B
Volume Liters (applies to Concentration mode only)
Temperature C (applies only if RH/T probe is attached).
RS232 mode Normal