ECD DO82, Инструкция пользователя

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HYDRA-DS NO
3
-N Page 29
3.2.3.1 C
ONFIGURE
4-20
M
A O
UTPUT
R
ANGE
1. Press on top left hand corner of the channel box you would like to configure. Select Ao for Analog out
2. Press on the channel box to bring up the menu channel window
3. Press CONFIG and press on the top left blue box to manually select which Analog out you would like to
configure (1 to 4 Ao)
4. Press on the blue box next to Name and manually name the Analog out
5. Press on the blue box next to Assigned to, to manual select which output should be used (Sensor, mA Inputs,
Dig Inputs, COM)
6. Press on the blue box next to 4 mA. Select the value you would like to set the 4 mA output
7. Press on the blue box next to 20 mA. Select the value you would like to set the 20 mA output
8. Press save
3.2.3.2 S
ENSOR
S
TART
U
P
All sensors are supplied with protective caps over the sensing end. Remove the cap(s) from the sensor before installing
in the process. All sensors were calibrated at the factory before shipment, no calibration should be necessary before
use. Allow the sensor to equilibrate to the process solution conditions for ½ hours before verifying the reading against
a grab sample. If calibration is required, follow the instruction in Section 4.0 below.
4.0 CALIBRATION
The HYDRA-DS Nitrate Analyzer was calibrated at the factory using the Two Point Calibration described below, and was
assembled and placed beaker of equilibration solution for 8-12 hours before starting the calibration. The Chloride Ion
and Nitrate Ion electrodes sensing membranes require several hours to properly hydrate/equilibrate to the measured
solution. The calibration sets the zero potential and slope for each of the sensors into the analyzers memory.
Since the factory calibration characterizes the complete measurement system the initial user calibration should only
require a standardization of the Nitrate Ion Electrode once the HYDRA-DS has equilibrated to the process solution.
The Factory Calibration and all subsequent calibrations should be performed in the following sequence:
1. Temperature Calibration
2. Chloride Electrode calibration in 1 ppm (or 10 ppm) and 100 ppm solutions (2 point)
3. Nitrate Electrode calibration in 1 ppm (or 10 ppm) and 100 ppm solutions (2 point)
Calibration checks should be performed weekly by comparison to a grab sample or immersing the HYDRA-DS sensor
into a standard solution with known pH, Cl, and NO
3
-N values. Performing a Single Point Calibration will eliminate any
offset found in the calibration check. Continuous drifting of the potassium or ammonium ion reading may indicate the
electrode to be replaced (see Section 6.0 Troubleshooting below).
Two Point Calibration is required whenever an electrode is replaced, pH, Chloride, or Nitrate. Two Point Calibrations
are also recommended every two months to verify the response of the electrodes is greater than 50 mV/decade.
4.0.1 R
ECOMMENDED
M
ATERIALS
pIon Calibration Solutions

1 ppm Cl, 500 ml (Part# 2020453)

100 ppm Cl, 500 ml (Part# 2010454)

1 ppm NO3-N, 500 ml (Part# 2010451)

100 ppm NO3-N, 500 ml (Part# 2010452)