Xylem 780 User Manual
MANUAL FORMANUAL FOR
MANUAL FOR
MANUAL FORMANUAL FOR
MJK LIQUID SAMPLER 780MJK LIQUID SAMPLER 780
MJK LIQUID SAMPLER 780
MJK LIQUID SAMPLER 780MJK LIQUID SAMPLER 780
ContentsContents
Contents
ContentsContents
ApplicationApplication
Application
ApplicationApplication
1 General information page 2
2 Operation 2
MountingMounting
Mounting
MountingMounting
3 Specifications 2
4 Mounting 2
5 Terminals 3
6 Examples 3
SettingSetting
Setting
SettingSetting
7 Operation 5
8 Start-up 5
9 Sequence 6
10 Adjustment of sequence time 6
11 External sequence 7
12 Example of control with PLC 7
MiscellaneousMiscellaneous
Miscellaneous
MiscellaneousMiscellaneous
13 Maintenance 7
14 Spare parts 8
15 Dimensions 8
M780GB/0911
1
GeneralGeneral
General
GeneralGeneral
MJK Liquid Sampler 780 is designed to make samples
from lakes, rivers, sewage systems, pumping stations etc. It
can be used in fixed installations or as a portable unit. The
sampler operates from the manual panel, or is controlled
from a flowmeter or a timer.
The sampler can be connected directly to an MJK 713
Ultrasonic flow converter for flow proportional sampling.
The MJK Liquid Sampler 780 consists of 3 modules: a
combined valve / compressor unit, a control panel and a
power supply, all located inside a rugged stainless steel
enclosure. The parts that need to be cleaned are mounted
externally.
OperationOperation
Operation
OperationOperation
MJK Liquid Sampler 780 is operated from the front panel
or can be controlled via external signals from flowmeter,
timer, or MJK Integrator 783. The MJK Liquid Sampler 780
can be connected dirctly to MJK Flowmeter 713 for flow
proportional sampling.
MJK Liquid Sampler 780 uses pressure and vacuum for
sampling. When the sampler receives a start signal from
either the control panel or an external signal, the sample
tube is pressurized to clear residue from the previous
sample. The vacuum remains on until the sample glass is
full. Then the glass is again pressurized to clear the surplus
liquid from leaving the required sample (20 ml to 500 ml) in
the glass.
When the required level is reached, the outlet valve opens
and the sample runs into the collecting container.
MJK Liquid Sampler 780 has a built-in alarm system. If the
sample tube is blocked during the filling of the sample
glass, the alarm operation re-pressurizes the sampler to
clear the obstruction. The cycle then starts again. If the
sample glass is not filled at the second try within a preset
time, the sampler will not be blocked.
The control system of the sampler is in a sturdy design and
is unaffected by electrical noise. The sampler can be
operated manually or controlled from a flowmeter or timer.
Mechanical mountingMechanical mounting
Mechanical mounting
Mechanical mountingMechanical mounting
The sampler should be mounted on a wall or bracket. On
the back of the cabinet there is 2 'keyhole' slots at the top
and a slot at the bottom. Note, that 230 mm free space is
required at the left hand side of the cabinet in order to be
able to open the upper part of the cabinet. The sample
tube is immersed in the channel or the basin where the
sample will be taken from. The outlet tube runs to the
sample container, where the samples are stored until
analysed. The tubes may be extended as required.
Please observe the following when mounting the sampler:
- The sampler must be mounted vertically so the inlet and
outlet can have the most optimum position. Vertical
mounting is required for utilizing the measuring scale on
the sample glass.
- The maximum vacuum capacity of the sampler is 8m WG
(0,8 bar) and is used to lift the sample from an lower
liquid surface, and to overcome pressure loss in the
sample tube.
- The sampler must be mounted so the sample container
can be placed underneath. Under particular
circumstances it can be placed elsewhere, since the
measured sample is forced out of the sample measuring
chamber.
- During the summer months we recommend to avoid
exposing the sample container to the heat of the sun.
- During the winter it will be necessary to protect the
sampler from frost. The sampler is able to function down
to -20° C, since the sampler is drained after every
sample; there is only a minor risk for frost damages. On
the other hand, the sampler must be protected, warmed
and insulated when it is placed outdoors. Consideration
as to air temperature, temperature and size of every
sample as well as how long the samples have to be in
the sample container, must be taken.
However if another cycle is desired , all cycle functions are
located on a terminal block, so the control of the internal
functions and monitoring can be taken over via a PLC or pc.
SpecificationsSpecifications
Specifications
SpecificationsSpecifications
SamplingSampling
Sampling
SamplingSampling
Cycle time: App. 2 min (adjustable to 1 - 10 min)
Amount: 20 ml to 500 ml
Suction height: 0,75 bar abs
Pressure: Max. 1 bar (when flushing the sample hose)
Sample temp.: Max. +60
Environment: –20 - +60
Suction tube: PVC, inner dia. 9,0 mm x 2 m
Outlet tube: Silicone, inner dia. 9,5 mm x 1 m
Mechanical dataMechanical data
Mechanical data
Mechanical dataMechanical data
Housing: Stainless steel
Enclosure: IP 55
Weight: 5 Kg
Dimensions: 165 mm x 410 mm x 235 mm (w x h x d)
Electrical dataElectrical data
Electrical data
Electrical dataElectrical data
Supply: 110/220V AC and 12V DC
Consumption: 30 W during sample, 2 W stand by.
0
C
0
C
The sample tube must be straight without kinks when the
vacuum cycle begins. (See illustration below).
SAMPLE SAMPLE
TUBE TUBE
WRONG! CORRECT!
2
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