Sampler operation – Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual User Manual
Page 63
61
Sampler operation
The SDI-12 interface is enabled only if a device is connected and if
it is detected on the external SDI-12 connector. Scanning for a
sonde occurs automatically. If a sonde is detected, a selection for
configuring the SDI-12 interface is placed in the System Setup
menu. Choose Menu> System Setup and scroll to the bottom of
the list:
The SDI-12 option is displayed.
The SDI-12 setup menu is used to obtain details about the
connected sonde, configure the parameter type and unit, and set
how often the SDI-12 device is scanned for new measurement
data.
DISPLAY SONDE: Displays specific information regarding the
attached SDI-12 device including the device Vendor Name, the
device Model Name, the current SDI-12 address assigned to the
device, the SDI-12 protocol version implemented on the device, the
number of measurements available, and the warm-up time.
CFG PARAMETERS: allows the user to define a readable
measurement type and unit to the generic measurement channels
returned by the SDI-12 device. Each channel is displayed with a
generic reference indicator according to the order defined in the
SDI-12 device. In addition, the user can assign a label such as
'temperature' and a unit such as ‘celsius’ to each measurement
channel. Assignment of a specific measurement and unit to a
SDI-12 channel makes the channel easier to identify when defining
a setpoint sampling algorithm or viewing measurement status. The
following measurements are supported by the SD900:
Figure 29 Measurements supported by SD900
Measurement
Unit
Resolution
1
Ammonia (NH3)
mg/L-N
2
Ammonium (NH4+)
mg/L-N
4
mV
4
Chloride (CL-)
mg/L
4
mV
4
Chlorophyll
ug/l
2
Volts
2
Conductivity
mS/cm
3
uS/cm
3
DO
mg/L
2
%sat
2
Ext. Sonde Pwr
Volts
4
%
4
HOCl
ppm
4
Volts
4
Int. Sonde Pwr
Volts
4
%
4
Level
meter
3