C400 Series Operating Manual
26
Read Instruction Mode
The communication protocol adopts MODBUS (RTU) protocol. The content and address of the communication can be changed according
to the needs of customers. The default configuration is network address 01, baud rate 9600, even check, one stop bit, users can set their
own changes; Function code 0x04: This function enables the host to obtain real-time measurements from slaves, which are specified as
single-precision floating-point type (i.e. occupying two consecutive register addresses), and to mark the corresponding parameters with
different register addresses.
Communication address is as follows:
0000-0001: Temperature value
0002-0003: Main Measured Value
0004-0005: Temperature and Voltage Value
0006-0007: Main Voltage Value
Communication examples:
Examples of function code 04 instructions:
Communication address = 1, temperature = 20.0, ion value = 10.0, temperature voltage = 100.0, ion voltage = 200.0
Host Send: 01 04 00 00 08 F1 CC
Slave Response: 01 04 10 00 00 41 A0 00 00 41 20 00 00 42 C8 00 00 43 48 81 E8
Note:
[01] Represents the instrument communication address;
[04] Represents function code 04;
[10] represents 10H (16) byte data;
[00 00 00 41 A0] = 20.0; / temperature value
[00 00 4120]= 10.0; // Main Measured Value
[00 00 42 C8] = 100.0; / / Temperature and Voltage Value
[00 00 43 48] = 200.0; / / Main measured voltage value
[81 E8] represents CRC16 check code;
Daily Maintenance
Certain ProCon
®
sensors Instruments require routine maintenance, ex. pH calibration.
Simple Check Method: set the parameter zero offset as 0.0mV and the slope as 1.00,
then shortcircuit the terminal “Input” and “Ref”, the instrument should be displayed
in 7.000 or within the error range; If the display is not correct, please contact the
manufacturer for maintenance.
Please pay attention to the following points for the maintenance of sensors.
1.
When adopting the circulation structure, the velocity of inlet water sample should be kept as constant as possible.
2.
When leaving the factory, there is a protective cap on the head of the electrode, which contains electrode soaking solution to maintain
the moisture of the sensitive membrane. The protective cap should be taken off before use and screwed on when not in use.
3.
The new electrode can be immersed in 3.3m KCI concentration immersion solution for one day and night to ensure the accuracy of
calibration.
4.
Calibration before installation is recommended.
5.
When the site is out of water for a long time and not in use, the electrode should be screwed on the protective cap in time, and 3.3m
concentration of immersion solution should be put into the protective cap.
6.
Dirt on the glass ball on the top of the electrode can be cleaned with 0.1N hydrochloric acid and then invaded into the 3.3m KCI solution
for activation.
7.
Do not touch it by hand.
8.
To ensure long-term accurate measurement, the electrode should be cleaned, maintained and calibrated regularly.
9.
(9) Sensor should be replaced when calibration is no longer effective.
When the electrode is not in use, the electrode should be
immersed in the solution. The preparation of the soaking solution: take a package of pH4 buffer, dissolve in 250ml pure water,
then add 56g of analytical pure KCl, heat and stir it until it is completely dissolved.(note: the electrode is easy to fail when stored
in the dry discharge state)