Configuration; Overview; Table 3-1 Buffer Groups And The Ph Standard Values - Honeywell DirectLine DL421 User Manual

Configuration

3.1 Overview

Configuration Parameters
Set Up consists of configuring the following functions:
• Buffer Group Selection – Only used with Auto Buffer Recognition calibrations.
Determines the set of standard pH buffer values to be used for Zero
(standardization) and Slope calibration by automatic buffer recognition. Each of
the available Buffer Groups is a set of 5 pH buffer standards that you can
select.
The available groups are: US (default), NIST, and EURO.
Buffer Group
US (default)
NIST
EURO
• Solution Temperature Coefficient – Typically only used in power plants for
condensate/feedwater applications. Measured pH is displayed and transmitted
to a pH value normalized to what the pH value would be if the temperature of
the process was 25 °C. Magnitude of normalization is dependent upon the
Solution Temperature coefficient, expressed in units of pH/10 °C with precision
to the hundredth decimal place.
The three available values are: 0.00 (standard setting, default), −0.16 pH/10 °C
(pure water), and −0.32 pH/10 °C (condensate/feedwater).
• Noise Suppression Frequency Selection – Selection of 50 Hz or 60 Hz.
Defaults to 60 Hz at unit reset.
• Output Configuration – The following Output Configuration functions can be
selected:
0% Range
100% Range
0% Calibration
100% Calibration
14
3. Configuration

Table 3-1 Buffer Groups and the pH standard values

2 4
1.68 4.01
1 3
0 % Range values can be adjusted within a range
0.00 to 14.00 pH in 0.50 pH increments.
100 % Range values can be adjusted within a range
0.00 to 14.00 pH in 0.50 pH increments.
Output current can be typically adjusted to within a
range of 3.80 mA to 4.40 mA.
Output current can be typically adjusted to within a
range of 19.60 mA to 20.40 mA.
DirectLine® DL421 Sensor Module User Manual
pH Buffers
7 10
6.86 9.18
6 8
Display
12 US
12.45
nISt
10 Euro
2/04