Products: Microlink 840

The versatile, compact Microlink 840 is the culmination of over 40 years of experience designing data acquisition and control systems. This 8-channel, battery-backed, data logger can also monitor alarm thresholds and output digital control signals. All functions are set through software on a PC communicating with the Logger via MQTT, TCP/IP, Wi-Fi, Internet or Ethernet. The Microlink 840 is ideally suited for:

• Logging data from gas, electric and water meters
• Monitoring machines to record percentage on/off times
• Counting items produced
• Monitoring digital sensors like flow meters
• Counting switch closures
• Monitoring analogue transducers including pressure, temperature, force, voltage and current.

Listen to a conversation about the Microlink 840 and its manual...

It is available from us and Windmill's data acquisition shop . You can also download the data logging leaflet.

Features | Counting Options | Raise Alarms | Utility Meter Monitoring | Saved Data | Ordering | User Manual

---

Data Logger Features

• Includes the powerful yet easy-to-use Windmill software for Windows
• Save data as text, xml, EnergyLens files and to a MySQL database
• All results presented in engineering units of your choice (kilowatt-hours, ^oC, cubic meters, windspeed, products per hour, etc)
• Two alarms can be set on a combination of channels
• Count totals, frequency, periods, pulse widths and elapsed time.
• Count to over 16 million
• Save minimum, maximum, final and averaged values over your chosen logging interval.
• Control digital outputs
• Automatically e-mail data and reports
• Read the Loggers' data from any enabled PC on the network or Internet
• Free technical support for life
• Money-back guarantee if not satisfied

---

Counting Options

The Microlink 840 offers many counting options:

• Accumulating counts
• Frequency measurement
• Period measurement
• Pulse width counter
• Elapsed time counter
• 16-bit or 32-bit counting: 16-bit allows counting up to 65000; 32-bit allows counting to over 16 million.

You can set a scale and offset factor to the count from software. For example if the pulses came from a flow meter which produced one pulse for every 50 millilitres, a scale factor of 0.05 would give a reading in litres.

---

Raise alarms

• Alarm on analogue level, on-off state or count
• Set two alarms on a combination of channels
• Switch a digital output on alarm, sounding a buzzer, turning on a light or switching equipment off for example
• Notify alarms to remote PCs over Ethenet or Internet
• Insert a delay before an alarm is triggered, helping prevent false alarms

---

Utility Meter Monitoring

Log data from gas, electricity and water meters and send the consumption readings to a central PC running Windows. The Microlink 840 lets you monitor demand in real-time and identify patterns of use.

• Data files can be read by Excel, Energy Lens, and other software
• Continuous monitoring, logging and display using Windows software.
• See consumption in real-time
• Record total usage and usage over your chosen set intervals, for example each hour's and each day's demand
• Chart data and show tables of recent readings
• Alarm indication on all readings - set thresholds above or below which alarms are triggered and logged
• Each Microlink 840 can monitor 8 meters
• Maximum count of over 16 million
• All data is time-stamped
• Log the counts from the volt-free contacts of your utility meters
• Works with any meter emitting contact closure pulses

---

Logged Data

Data can be saved in text files, xml files, Energy Lens files and to a MySQL database.

For each channel you can store...

• Maximum value over the logging interval
• Minimum value over the logging interval
• Average value over the logging interval
• Final value of the logging interval
• Custom calculations on saved data

---

Ordering the Microlink 840 Data Logger

The Microlink 840 costs just £455 and is available on-line through Windmill Software's data acquisition shop. You can also buy direct from us - e-mail salesteam@microlink.co.uk or telephone +44 (0)161 834 6688. Whether bought from Windmill or ourselves we provide free technical support for life.

---

More Information

Please get in touch if you need more information - e-mail salesteam@microlink.co.uk, listen to the overview of the 840 Manual, download the Data Logger leaflet or the 840 manual.

---

Specifications

Number of inputs:	8
Current input range:	4–20 mA
Voltage input range:	By default 0–3.3 V - Can be made input range: 0-5, 0-10 V or bipolar
Logging epoch:	1 minute to 9 hours
Logging values:	Maximum, minimum, average and final value of epoch + custom calculations on data
Counting options:	Accumulating, frequency, period, pulse width, elapsed time
Maximum count:	Over 16 million
On & off time before a count is logged:	Selectable from 1 to 255 millisecs
Count resolution:	16- or 32-bit
Data storage:	Depends on number of channels and logging interval, eg 8 channels of data + maximum, minimum and average value logging every hour gives a month's data storage.
Communications:	MQTT, TCP/IP, Wi-Fi, Internet, Ethernet
Data available in real-time