2YL-M90-4M Multi Input Logger (Internal Temperature / Humidity + External Probes)


Grant Instruments


Integrated temperature and humidity sensors and 2 configurable channels. Accepts probes for temperature, humidity, voltage, current, luminance, CO2 and more.
Supplied with YoyoLog View software, USB lead and long life battery.

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Environment of Use Indoor/Outdoor
Type of Logger Multicanal
ADC Bits 20 bit
Precision ±1%
IP Classification IP65
Battery Life 4 years
Memory Capacity 4 million readings

• Rugged IP65 housing
• Status LED: - Indicates Alarm - Low Battery Warning
• Accepts 2 x External Probes
• Multi function logger
• 2YL-M90-4M: Intergrated Temperature and Humidity sensors

Software YoyoView (YY-100)

The basic software (YY-100), included with the logger, is suitable for configuring the logger, downloading basic data and exporting data. The yoyo logger can be connected to laptop or PC via a USB port.

It is also available for download here:

Dimensions (d x h) 50 c 33mm
Ambient temperature range -40 to +90°C
Measuring range -70 to +250°C with Probe
Accuracy 1% of selected measurement
Internal sensor resolution 0.01
Signal input Free or low level pulses <0.5VDC amd high, between 2 and 3 VDC - with YY-CS Cable
Memory capacity (readings) 4 million
Active start
Sensor type

Multilogger - Internal Temperature/Humidity + External Probes

Humidity Sensor
(Internal and External)

0 to 100% RH/0.01% RH
Voltage Pulses range 0 to 65000 pulses, interval 0 to 100 pulses per second
Voltage resolution 1Hz, 1 Pulse
Intervals 1 second to 24 hours
IP rating 65
Battery type LITH-12

Battery life (Logging Speed)
1 minute

4 years

10 seconds

230 days

1 second

25 days
Robust, shock proof
Suitable Probes PT100/PT1000

Note: Optional Extras include - YoyoView Software, Calibration Certificate, Wall holder, Lead Seal Kit, Probes and Accessories.

** Higher voltage levels up to 24Volts require the YY-CP cable.

  • Test and measurement  

Uptime monitoring of harbour cranes, photovoltaic systems. Recording on-board voltage of a racing car or helicopter. All kinds of analogue signals from sensors/transducers. Recording the signal of a CO2-Sensor in a transport box. Tyre manufacturing, raingauge, water supply counter.

  • Electricity Measure

AC current with current clamps

  • Weather monitoing  

Monitoring outside temperature / humidity and via connected sensors also soil moisture and rainfall. Weather station, weather balloon.

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