Calibration Instructions - l-com SRWQ100-YL105-9001 User Manual

Calibration Instructions

Before Calibration:

Write the residual chlorine calibration value to the sensor before calibration.

If the calibration is 1.0 mg/L, write the current data to the 0x24 register (Floating point
1.0 to hexadecimal number is 3F800000, high and low transposition is 00003F80).

Send command : 0110 00 24 00 02 04 00 00 3F 80 E0 14.
The First Point - Zero Calibration:

The sensor is cleaned and dried and put into the residual chlorine 0 mg/L solution.
Send command: 01 03 00 66 00 01 64 15.

After the measured AD value is stable, read the AD value in the 0x66 register;

Write the instruction to confirm the calibration to the 0x3E register.
Send command : 01 06 00 3E 00 FF A8 46.
The Second Point - High Point Standard Calibration:

The sensor is cleaned and dried and put into the residual chlorine 1.0 mg/L solution.
Send command: 01 03 00 66 00 01 64 15.

After the measured AD value is stable, read the AD value in the 0x66 register;

Write the instruction to confirm the calibration to the 0x3F register.
Send command: 01 06 00 3F 00 FF F9 86.

The residual chlorine sensor generally only needs to calibrate the high point, and may
also calibrate both of the high and low points.
Address Description
Name Hosting
Number
Measurements 0x 00 01
Temperature
0x 00 03
Measurement
Current Output
0x 00 05
Value
Warning 0x 00 07
Upper Limit Of
0x 00 0A
Measurement
Data Length Read/
Type Write
Floating
2
Point
Floating
2
Point
Floating
2
Point
Integer 1
Floating
2
Point
8
Description
Storage location for measured value
Storage location for measured
temperature
Output current based on DO
measurements
01: Measurement exceeds the
upper limit;
02: Measurement exceeds the
lower limit;
03: Temperature exceeds the
upper limit;
04: Temperature exceeds the
lower limit
Upper limit of measured value
(20mA corresponding value)