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	1	+Datalogger

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	1	+Environmental Surveys.Research.WebHome

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	9	+Data loggers are elongated devices that can be hung in a monitoring well. They can measure the groundwater at various times over a longer period of time. Depending on the data loggers, different (combinations) of parameters of the groundwater can be measured. After a certain period, the data loggers can be removed from the monitoring well and the measurements can be transferred via a cable to a computer for further processing and interpretation, or read out telemetrically via a GSM modem or bluetooth.
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	14	+|(% colspan="3" style="text-align:center" %)**General information**
	15	+|(% colspan="2" %)Name|(((
	16	+data logger.
	17	+
	18	+A specific version is the diver.
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	20	+|(% colspan="2" %)Unit of measure and parameter|(((
	21	+Pressure in cm H ,,2,, O.
	22	+
	23	+temperature in ^^0^^ C.
	24	+
	25	+EC in mS/cm (depending on type).
	26	+)))
	27	+|(% colspan="2" %)Soil phase|groundwater
	28	+|(% colspan="2" %)Nature technique|Physical, chemical or probe/sensor
	29	+|(% colspan="2" %)Place of application|in situ
	30	+|(% colspan="2" %)Detection Mode|Measurement at ground level / water bottom or on surface of open water
	31	+|(% colspan="2" %)Applicable in separate layers|Yes with a minimum layer thickness of 1 m
	32	+|Soil types for which technology is suitable|(% colspan="2" %)(((
	33	+* homogeneous well-permeable sand package
	34	+* one sand package, with poorly permeable layers
	35	+* poorly permeable top layer, cross-section with layers of sand
	36	+\\\\
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	38	+|(% colspan="2" %)Land soil/water bottom|land soil and water bottom
	39	+|(% colspan="2" %)Step in the data collection chain|Sampling, measure or data collection and evaluation
	40	+|(% colspan="2" %)Moment of availability results|Measurement results are available in the field
	41	+|(% colspan="2" %)Technology development phase|widening phase or applied routinely
	42	+|(% colspan="2" %)Method of purchasing|as service, as a product or as a device
	43	+|(% colspan="2" %)General description of the implementation method|(((
	44	+The data logger is suspended in a monitoring well. Measurements are taken at a preset time interval and stored in the memory of the data logger. At the end of the period, all data is read out with a computer.
	45	+
	46	+The following techniques are available for reading the data logger without first removing it from the monitoring well:
	47	+
	48	+* Data cable: with this cable the data logger can be connected to a computer at ground level near the monitoring well for reading and programming;
	49	+* Diver-NETZ (specific for datalogger type Divers): the datalogger is connected by means of a DDC to a transmitter, with which the data from the datalogger can be sent wirelessly to a PDA or laptop. Monitoring wells can also be networked in this way. The distance range of the transmitter is approximately 100 – 150 m.
	50	+* Telemetry: The data logger is connected to a field modem by means of a cable. Messages are sent from the field modem with the measurement data. The messages can be received at any location. This means that it is no longer necessary to read out the data logger in the field.
	51	+* Reading the data logger with bluetooth.
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	53	+|(% colspan="2" %)Working principle|(((
	54	+The data logger is a pressure transducer in which some versions can also measure parameters such as temperature, EC or oxygen content. After programming, the data logger is suspended in a monitoring well. To derive groundwater levels, the use of a so-called 'baro-logger' is necessary. The baro-logger measures the air pressure. With the data from the baro-logger, the measurements of the ordinary data loggers are corrected for air pressure variations (the ordinary data logger measures the air pressure + the pressure of the water column above the data logger). Some data loggers have built-in baro loggers.
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	56	+After a certain period (depending on the nature and purpose of the assignment and the selected measurement frequency), the data is read from the data logger.
	57	+
	58	+A data logger can also be used to perform surface water level measurements.
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	60	+|(% colspan="2" %)Point / line measurement / volume measurement|Point measurement
	61	+|(% colspan="2" %)Typical depth range|0 - 300 m and the sensitivity is independent of depth
	62	+|(% colspan="2" %)Time properties|(((
	63	+A data logger can be hung in a monitoring well for a longer period of time (eg monthly, quarterly or half yearly). The data logger can be programmed with which time interval measurements should be performed and stored.
	64	+
	65	+Setting and reading a data logger can take place within 1 hour. Measurement frequency can be preset (between 0.5 sec and 99 hours).
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	67	+|(% colspan="2" %)Measuring rate|Measurement data can be read immediately after the measurement.
	68	+|(% colspan="2" %)Presentation results|With the accompanying software, the results can be viewed directly in the field.
	69	+|(% colspan="2" %)Cost|(((
	70	+- Standard data logger: approximately €500
	71	+
	72	+- Baro logger: approximately € 350
	73	+
	74	+- Cost of field investigation (including placing monitoring well, driving costs and installing data logger)
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	76	+|(% colspan="2" %)Trends and developments|Read out data via bluetooth.
	77	+|(% colspan="3" style="text-align:center" %) **User information**
	78	+|(% colspan="2" %)Availability|one or a few providers in NL
	79	+|(% colspan="2" %)Is technology often used?|Very organized
	80	+|(% colspan="2" %)Research phase in which technology can be applied|Explore, map out, variant selection, design, realization, check, monitoring and aftercare
	81	+|(% colspan="2" %)Verification measurements / calibration measurements|are often used
	82	+|(% colspan="2" %)Frequently used application in practice|(((
	83	+Various projects where groundwater levels/quality must be recorded for a longer period of time or with a relatively high measuring frequency, such as:
	84	+
	85	+* monitoring;
	86	+* permeability measurements / pump tests;
	87	+* monitoring the effects of water system interventions (groundwater abstraction / water level change);
	88	+* determine the response of the groundwater system to precipitation events.
	89	+)))
	90	+|(% colspan="2" %)Suitability|In all soil layers, provided that a monitoring well is present with good flow
	91	+|(% colspan="2" %)Practical experiences in the Netherlands|Data loggers are regularly used by various parties (including municipalities, water boards, provinces, water companies and research and engineering firms)
	92	+|(% colspan="2" %)“Dos“|(((
	93	+Before installing and retrieving a data logger, perform a manual measurement of the groundwater level.
	94	+
	95	+Measure the height at the top of the monitoring well in relation to NAP.
	96	+
	97	+Measuring and registering the depth at which the data logger hangs.
	98	+
	99	+Water pressure correction for air pressure variances.
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	101	+|(% colspan="2" %)“Don'ts”|(((
	102	+Hang data logger too shallow (data logger falls dry)
	103	+
	104	+Hang data logger too deep (note measuring range!)
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	106	+|(% colspan="2" %)Also suitable for|Measuring surface water levels.
	107	+
	108	+= References =
	109	+
	110	+* [[https:~~/~~/www.bodemrichtlijn.nl/Bibliotheek/bodemonderzoek/onderzoekstechnieken/datalogger>>https://www.bodemrichtlijn.nl/Bibliotheek/bodemonderzoek/onderzoekstechnieken/datalogger]]
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	117	+= Falabella =
	118	+
	119	+[[image:datalogger.jpg||alt="image.jpg"]]
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	121	+|=(% scope="row" %)Image|[[Datalogger>>https://www.bodemrichtlijn.nl/Connect/bodemonderzoek/fts028-1]]
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	125	+(((
	126	+**Contents**
	127	+
	128	+{{toc/}}
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