Main characteristics and technical indicators of the instrument

2.1 Main functional characteristics of the instrument

1) Sample retention function for bottle separation: the instrument can achieve 1~24 Samples are kept in separate bottles, and the number of bottles can be freely set.

2) Sampling function: It can achieve timed sampling, time proportional, flow proportional, external control samplingMultiple sampling methods such as serial port control.

3) Sample retention function: It can achieve functions such as excessive sample retention, synchronous sample retention, direct sample retention, and serial port control sample retention.

4) Sample supply function: can be sent to COD、 Multiple online monitoring devices for ammonia nitrogen, heavy metals, etc. simultaneously provide uninterrupted mixed water samples.

5) Sample retention recording function: It can record the sample bottle number, retention time, retention amount for each samplingCOD Value and NH3-N Value, can record new 1000 number of articles According to records.

6）External interface: flowmeter simulation interface,RS485 Interface.

7）Power off protection function: After the instrument is powered off and reconnected while in operation, it can automatically restore to its original state Running status, instrument parameters will not be lost after power failure.

8）Automatic emptying function: After each sampling is completed, the system can automatically empty the water in the sampling tube to ensure that the sampling tube is emptied The road is not blocked by sedimentation.

9）Anti overflow function: Users can set the number of sample bottles to be retained, and stop retaining samples after completing the set number of bottles.

10）Water sample refrigeration function: Using an efficient refrigeration device, the retained water sample can be stored in 0 ℃ to 4 ℃ environment.

2.2 Main technical indicators of the instrument

l Sampling interval:1min～9999min Can be set

l Number of sample bottles retained:24 bottle

l Single retention quantity:10ml～1000ml

l Sample retention error:±7% (sample retention) 200ml When)

l Equal proportion sample size error:±8%

l Built in sampling pump suction:≥6.5 rice

l Horizontal sampling distance:≥60 rice

l Water sample storage temperature:0℃～4℃（±1.5℃）

l Airtightness of pipeline system:≤-0.07MPa

l averageContinuous running time:≥ 1440h/time

l Insulation impedance:>20MΩ

l Simulation interface:4mA～20mA/0.5V～2.5V

l Digital input interface: switch quantity

l Flow measurement access form: flow meter analog signal

l Overall dimensions:446mm x 500mm x 1400mm (length x width x height)

l Weight:60kg

l Power:75W

l Working voltage:AC220V±10%，50Hz±1Hz

l Operating Temperature0℃～50℃

l Working humidity:≤85％RH

2.3 Instrument working mode description

1) Timed sampling: According to the sampling schedule, the water quality automatic sampler will collect quantitative water samples from the sampling pointsCollect the mixed water samples into a mixing sampling bucket and empty or save them in a retention bottle according to the set parameters. 2) Time proportional sampling: According to the set sampling time interval, the water quality automatic sampler will quantitatively collect the water sampleThe sampling points are collected into a mixed sampling bucket, and the collected mixed water samples are emptied or saved according to the set parameters

Sample bottle.

3) Proportional sampling of flow rate: For each volume of water flowing through, the automatic water quality sampler automatically quantifies the waterThe sample is collected from the sampling point into the mixed sampling bucket, and the collected mixed water sample is emptied or saved according to the set parameters Go to the sample bottle.

4）External control sampling: When receiving an external trigger signalWhen the switch signal is activated, the water quality automatic sampler will setCollect water samples from the sampling point into a mixed sampling bucket, and empty the collected mixed water samples according to the set parameters Save in the sample bottle.

5）Serial port control: When receiving a serial port command, sample, supply, and retain samples according to the command requirements

3. Instrument composition and peripheral interfaces

3.1 Internal composition of the instrument

1) Automatic water quality samplers mainly include microcomputer controllers, keyboard displays, water sample distributors, and water sample coolersComposed of storage boxes and sample bottles.

2) Sample bottle number

The total number of sample bottles retained by the sampler is 24 It is made of polyethylene and stored in a refrigerator 4×6Matrix distribution, Its position and number are shown in the following figure (front view):

3.2 Peripheral interface

The peripheral interface of the water quality automatic sampler includes two parts: waterway interface and circuit interface.

Waterway interface:

The "sampling" port is the inlet of the sampler for collecting water. When using the sampler, connect the sampling tube from the sampling port to the water source.

'Sample supply (output)' refers to the water sample output port of the sampler to the monitoring instrument, through which the water sample flows out.

'Sample supply (input)' refers to the return port of the water sample supplied by the sampler to the monitoring instrument, through which the water sample flows back.

Circuit interface:AD0: Connect the output analog signal of the flowmeter, with a range of 4mA to 20mA.

AD1: Connect the output analog signal of the COD monitor, with a range of 4mA to 20mA.

AD2: Connectionammonia nitrogenThe output analog signal of the monitoring device has a range of4mA～20mA。

AD3: ConnectTotal PhosphorusThe output analog signal of the monitoring device has a range of4mA～20mA。

AD4: ConnectTotal NitrogenThe output analog signal of the monitoring device has a range of4mA～20mA。

sample supply：passiveSwitch type signal, sample input signal.

exceed the standard：passiveSwitch type signal, excessive sample input signal.

trigger：passiveSwitch type signal, external control sampling input signal.