2.1 Method basis: resorcinol spectrophotometry.

2.2 Measurement range： (0～100.0)mg/L 。

2.3 Accuracy：when ≤2.0mg/L，≤±0.2mg/L；when＞2.0mg/L，≤±10%。

2.4 Repeatability：≤5%。

2.5 Measurement period: The minimum measurement period is 50 minutes (depending on the length of the digestion time). According to the actual water sample, the digestion time can be arbitrarily modified at (10 ~ 45) min.

2.6 Sampling period: The time interval (1~999min) can be adjusted arbitrarily and the whole point is selected.

2.7 Calibration cycle: manual calibration or set cycle for automatic calibration.

2.8 Maintenance period: usually once a month, about 30 minutes each time.

2.9 Environmental requirements: indoor temperature adjustable, recommended temperature (5 ~ 28)℃; humidity ≤ 90% (no condensation).

2.10 Power：AC（220±22）V，（50±5）Hz，5A。

2.11 Size：Length550×Width400×High1500mm

2.12 Other: Abnormal alarm and power failure will not lose data;

Touch screen display and command input

After abnormal reset and call after power failure, the instrument automatically discharges residual reactants in the instrument and automatically resumes working condition.