52
Optional Device Installation
6.
Select another channel to configure or press
RETURN
to back up one step. Press the
MAIN MENU
function key to return to the Main Menu.
7.3.3 ORP Preamplifier/Junction Box Calibration
Calibration of the ORP input circuit requires a source of dc voltage between 500 and
2000 m V dc. The reference voltage must be applied to the ORP input terminals on the
preamplifier/junction box during calibration. A regulated dc power supply or a standard
“C” cell battery (1500 mV dc) make excellent sources for reference voltage.
1.
From the Main Menu, select
OPTIONS > ADVANCED OPTIONS > CALIBRATION > ORP.
2.
Install the ORP junction box on the sampler with the ORP probe removed.
3.
Apply a positive reference voltage to the ORP probe terminals in the junction box,
using either a 1.5 V dc “C” cell battery or a regulated power supply.
4.
Attach the positive battery terminal to the terminal block screw labeled “glass” and
the negative battery terminal to the terminal block screw labeled “ref”.
7.4 Dissolved Oxygen Probe
The DO/Conductivity option is available with or without additional analog inputs. See
Analog Communications on page 64
for wiring and configuration.
7.4.1 Dissolved Oxygen Probe Connection
The pre-amp (P/N 3369 or 3212) is required. Plug the probe into the pre-amp and plug
the pre-amp into the 950 flow meter.
7.4.2 Dissolved Oxygen Probe Programming
1.
From the Main Menu, select
OPTIONS>ADVANCED OPTIONS>DATALOG.
2.
Highlight Select Inputs using the
UP
and
DOWN
soft keys and then press
SELECT
.
3.
Highlight D.O. using the
UP
and
DOWN
soft keys, then press
SELECT
.
4.
Press
CHANGE CHOICE
to cycle between Logged and Not Logged, then press
ACCEPT
.
5.
Enter a logging interval using the numeric keypad, then press
ACCEPT
. Valid logging
intervals are shown on the status bar along the bottom edge of the display.
6.
Press
CHANGE CHOICE
to select the appropriate units (ppm, ppb, mg/L, sat). Press
ACCEPT
to continue.
Table 19 Dissolved Oxygen Connector Pin Assignments
Pin
Signal Description
Wire Color
A
+12 V dc
white
B
signal ground
blue
C
input 1 (4–20 mA dc)
yellow
D
input 2 (4–20 mA dc
black
E
input 3 (4–20 mA dc)
red
F
dissolved oxygen (+)
green
G
dissolved oxygen temp. probe(+)
gray
H
conductivity (+)
brown
J
conductivity temp. probe
purple
K
not used
orange
Содержание Sigma 950
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Страница 20: ...18 Introduction...
Страница 34: ...32 Basic Programming Setup...
Страница 50: ...48 Sensor Installation...
Страница 82: ...80 Maintenance...
Страница 83: ...81 Appendix A Program Flow Charts Figure 22 Overview of Basic Program Menus...
Страница 84: ...82 Program Flow Charts Figure 23 Setup Flow Chart...
Страница 85: ...83 Program Flow Charts Figure 24 Options Flow Chart...
Страница 86: ...84 Program Flow Charts Figure 25 Alarms Menus Flow Chart...
Страница 87: ...85 Program Flow Charts Figure 26 Calibration Menus Flow Chart Page 1...
Страница 88: ...86 Program Flow Charts...
Страница 102: ...100 Programming Features...
Страница 106: ...104 Primary Devices Head Measurement Locations...
Страница 126: ...124 SCADA Modbus System Guidelines...