Water Quality Automatic Sampler DR-803N (Mixed Supply Self-Emptying Type) with functions for over-limit sample retention, synchronous sample retention, and direct sample retention.

Sampling functions: Supports various sampling trigger methods including timed sampling, time-proportional sampling, flow-proportional sampling, flow-tracking sampling, external control sampling, and serial port control.

Sample retention functions: Enables over-limit sample retention, synchronous sample retention, direct sample retention, and serial port-controlled sample retention.

Supply function: Can simultaneously provide uninterrupted mixed water samples to multiple online monitors such as COD, ammonia nitrogen, and heavy metals.

Manual comparison sampling port: Equipped with a manual sampling port for mixed water sample comparison.

Records: Includes sample retention records, door open/close records, power outage records, and alarm records.

Power-off protection: Automatically protects upon power loss and resumes operation when power is restored.

Remote control (optional): Enables remote status queries, parameter settings, record uploads, and remote-controlled sample retention.

Digital temperature control: Precise digital temperature control for the refrigeration chamber, equipped with a uniform heating system for accurate and even temperature distribution.

Automatic rinsing: Rinses the pipeline with the water sample to be tested before each sampling to ensure sample representativeness.

Automatic emptying of mixing barrel: The mixing barrel features rapid automatic emptying.

Automatic emptying: Enables automatic emptying of the pipeline and sample bottles.

Cleaning function: Automatically cleans the sampling pipeline and sample bottles before each sampling to prevent cross-contamination.

Automatic preservative addition: Can automatically add one or multiple types of water sample preservatives based on configuration.

External pump control: Directly controls external pumps to extend sampling distance.

Pipeline optimization: Uses rigid PVC material for sampling and supply pipelines to ensure effective and timely water sample collection.

Sample bottles

Single sampling volume

Sampling interval

Sampling records

Door open/close records

Sampling volume error

Power outage records

Specifications: 1000ml × 25 bottles

10ml~1000ml

1min~9999min

10,000 entries

2,000 entries

±7%

2,000 entries

Proportional sampling volume error

±8%

System clock time control error

Δ1 ≤ 0.1% Δ12 ≤ 30s

Water sample preservation temperature

2°C～6°C（±1.5°C）

Sampling vertical height

≥8m

Horizontal sampling distance

≥80m

Pipeline system air tightness

≤-0.085MPa

Mean Time Between Failures (MTBF)

≥1440 h/time

Insulation resistance

＞20 MΩ

Communication interface

RS-232/RS-485

Analog interface

4mA～20mA

Digital input interface

Switch signal

This water quality automatic sampler is widely used at pollution sources, inlets and outlets of sewage treatment plants, and is connected with online monitors for COD, ammonia nitrogen, total phosphorus, total nitrogen, heavy metals, etc. The designed flow-tracking sampling mode automatically adjusts the sampling flow based on instantaneous flow, enabling continuous sampling and ensuring more representative water samples. With functions such as AB barrel mixed supply, automatic emptying of sample retention bottles, and automatic addition of preservatives to retained water samples, it is an ideal supporting device for online monitoring systems of water pollution sources and overall solutions for total emission reduction.