The short version: choose an Ahlborn data logger on four numbers. How many measuring channels you actually need, the sampling rate in measurements per second, whether your probes are analog, D6 or D7, and which WinControl software tier the job requires. A device with enough sockets can still fail on the other three.
Every figure below is taken from Ahlborn's own product pages and ALMEMO selection documentation, so each one can be checked against the source.
Check 1: measuring inputs are not measuring channels
This is the most expensive misunderstanding in ALMEMO procurement. Ahlborn builds everything from single-channel transmitters up to acquisition systems rated at 1000 measurement inputs, and the socket count on the front panel tells you only part of the story.
Inside a D7 connector sits its own AD converter and its own processor. Ahlborn specifies up to 10 display and function channels per D7 connector, and on a V7 instrument every D7 plug runs in parallel at its own measuring rate. One socket, ten channels.
The ALMEMO 510 shows what that means at scale. It ships with two active measuring circuit boards and 20 ALMEMO input sockets, which Ahlborn rates at up to 200 sensor channels depending on the sensor. Expand the housing and the same system reaches up to 100 measuring inputs and up to 1000 measuring channels.
So compare offers on two questions: how many input sockets, and how many measuring channels once your intended sensors are accounted for. A quotation listing ten inputs but never mentioning channels has not answered either.
Start from the Ahlborn data logger range to see how input counts are split across the family.
Check 2: the sampling rate, quoted in mops
Ahlborn states measuring rate in mops, measuring operations per second. The general specification for the ALMEMO instruments lists four rate settings: 100, 50, 10 and 2.5 mops.
On the portable 2890-9 and on the 8590 and 8690 the standard figure is 50 mops, rising to 100 mops with an SD memory card, with an option for 400 mops on a single channel. The 5690 carries the same 50, 100 and 400 figures.
That is where parallel architecture pays. The measuring circuit boards work in parallel, so scanning time for a large channel count is set by the board carrying the most active channels, not by the total. On the 5690, several boards take the system past 100 channels per second. If you log 80 channels quickly, the per-board figure matters more than the headline rate.
Digital D7 sensors change the arithmetic again. Their measuring rate is determined by the AD converter inside the connector, and every D7 plug on a V7 instrument runs in parallel at its own rate. Ahlborn specifies up to 1000 measurements per second on the ALMEMO 710 when a microSD card is fitted.
Software can be the bottleneck. The fast scanning option for V7 devices in WinControl is specified up to 1000 mops online. For online monitoring rather than internal logging, that option belongs in the quotation.
Check 3: probe compatibility follows the device generation
Ahlborn's own summary is the honest one. Basically all sensors are suitable for all devices, but there are exceptions, and digital sensors cannot be connected to older devices.
The exceptions have hard boundaries. Digital ALMEMO D7 plugs connect only to V7 generation instruments, which Ahlborn lists as the ALMEMO 500, 710, 809, 202 and 204. D6 sensors need no special input but do not run on every device generation.
The compact V7 portables show the trade-off clearly. The 202-S and 204 accept all digital D6 and D7 sensors, plus ALMEMO standard sensors carrying the DIGI measuring range. Analog sensors have no route in. Two inputs on the 202-S, four on the 204.
The connector, not the instrument, holds the calibration data. ALMEMO connectors store multi-point adjustment and user linearization of up to 30 points, and calibration dates are managed in the connector and recognised automatically on plug-in. That is what makes a probe swappable between instruments without re-commissioning.
Your existing transducers are not locked out either. Ahlborn supplies pre-programmed ALMEMO connectors with the sensor parameters and measuring range already set, wired through six screw terminals. The system covers more than 60 standard measuring ranges, from temperature, humidity and gas flow to pressure, force, strain, pH and conductivity.
For regulated work, a D6 or D7 chain carries its own AD converter and is calibrated as a complete sensor and plug assembly, to DAkkS or factory standard. Accuracy then does not depend on which display device or extension cable it is paired with.
The ALMEMO connector range lists the variants, including pre-programmed connectors for thermocouples, Pt100 and NTC sensors.
Check 4: software is where the hidden cost sits
Ahlborn made one protocol decision that saves money: the software protocol and scope of commands are identical across all data loggers and measuring instruments, so the same WinControl package always fits. There is no per-generation licence.
Three programs are supplied without charge. ALMEMO Control and ALMEMO Connect handle device and sensor configuration, and ALMEMO View displays up to four measurement channels.
AMR WinControl is the paid tier, licensed by measuring points rather than by instrument count. Light covers 20 measuring points and one instrument. Standard removes both limits. Pro includes every option except the data server, web server and additional modules. Server adds an integrated data server so that several RMT WinControl clients can read the same installation at once.
The options decide whether a monitoring project works. Network capability addresses multiple devices; automatic file generation writes daily or weekly files; the alarm function records alarms, switches output relays and can start other applications. Extended evaluation, the web server, ODBC export and the calibration assistants are ordered separately.
The buying rule is simple. Count measuring points before you choose a tier, because a 20-channel installation on a Light licence is already sitting on the ceiling.
Comparison table
Which one to order
The four checks resolve into a short decision list.
- Under ten slow channels in the field, with mixed analog sensors: the ALMEMO 2890-9. Nine isolated inputs, 50 mops, sleep mode for unattended logging.
- Under ten channels, but with D7 sensors, a touchscreen and pressure compensation for flow or humidity: the ALMEMO 710.
- Two to four portable channels, with every probe digital or DIGI-range: the ALMEMO 202-S or 204. Cheaper, but it rejects a plain analog sensor.
- Twenty to one hundred channels, fixed installation, mixed vintages of sensor: the ALMEMO 510. It also buffers values in each board if the PC connection drops, which matters for unattended monitoring.
- Up to 190 inputs, legacy analog sensors, rack or protected industrial housing: the ALMEMO 5690.
One case sits outside this logic. If the requirement is a fixed-function temperature logger for a regulated validation study, with a predefined probe and a sealed data trail, a configurable ALMEMO system is more instrument than the task needs. The temperature data logger entry describes that different family.
Frequently asked questions
How many measuring channels does an ALMEMO data logger have?
It depends on both. Input counts run from 2 on the 202-S and 4 on the 204 up to 99 or 190 on the 5690. Channel counts are higher, because one D7 connector can carry up to 10 display and function channels. The ALMEMO 510 is rated at up to 200 sensor channels from its 20 sockets, expandable to 1000.
What does mops mean on an Ahlborn data logger?
Measuring operations per second. The ALMEMO instruments are specified at 100, 50, 10 and 2.5 mops, and the portable models are rated 50 mops as standard, 100 mops with an SD card, with an option for 400 mops on one channel.
Can I connect my own sensors to an ALMEMO instrument?
Yes. Ahlborn supplies pre-programmed ALMEMO connectors with the sensor parameters and measuring range already set, wired through six screw terminals, so other manufacturers' transducers need no modification. The real constraint is the device generation, not the brand: D7 plugs run only on V7 instruments, and the 202-S and 204 accept digital or DIGI-range sensors only.
Which WinControl version do I need?
Count measuring points first. Light covers 20 measuring points on one instrument, Standard removes the measuring point and instrument limits, Pro adds every option except the data server, web server and additional modules, and Server adds an integrated data server for several simultaneous clients.
Do I need a V7 generation instrument?
Only if you intend to use D7 sensors, which connect to the ALMEMO 500, 710, 809, 202 and 204. With analog or D6 sensors an older generation remains valid, but check the device first: D6 sensors do not run on every generation, and analog sensors will not run on the 202-S or 204.
Sourcing Ahlborn data loggers
QINUO supplies genuine, brand-new Ahlborn data loggers, ALMEMO connectors and sensors from its Hong Kong operation. We do not hold a factory appointment for every line we carry, so treat any claim of one without documents the way you would treat a cut-price listing. What we do is run the four checks above against your duty, then quote with the channel count, sampling rate and sensor generation written down.
Begin with the brand directory or the Ahlborn brand page. The four checks map onto four order points: channel count and generation to the ALMEMO range, probe compatibility to the ALMEMO connector range, sampling rate to the model, software to the WinControl tier. The full product catalogue covers the rest, and the glossary defines the terms used here. Send channel count, sensor type, required rate and software task through the contact page and we will work the comparison before anyone quotes a price.
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