Nokeval NSnappy Sense LWEU Series User manual

3004891141, V4, 16.3.2022
Firmware 1.0-1.0
User manual
Sense LWEU Series

2 - Sense LWEU Series
Contents
Introduction.............................................................................................................................................. 2
Installation.................................................................................................................................................3
Connections...........................................................................................................................................3
Usage ........................................................................................................................................................3
Measuring with NSnappy Sense............................................................................................................ 4
Measuring with NSnappy Sense IR........................................................................................................ 4
Maintenance..............................................................................................................................................5
Replacing the battery.............................................................................................................................5
Cleaning.................................................................................................................................................5
Service ...................................................................................................................................................5
There are no user serviceable parts in these devices. If the device needs service, contact your NSnappy
service partner for more. ...........................................................................................................................5
Troubleshooting ........................................................................................................................................5
The readings do not appear or update in NSnappy ................................................................................5
The readings appear to be too high or too low with Sense.................................................................... 6
The readings appear to be too high or too low with Sense IR................................................................ 6
The reading only updates with a few second intervals........................................................................... 6
Specifications ............................................................................................................................................7
Warnings .................................................................................................................................................. 8
Trademarks .............................................................................................................................................. 8
Manufacturer............................................................................................................................................ 8
Introduction
Nokeval NSnappy Sense series measuring instruments are LoRaWAN devices designed to be used
together with the NSnappy service. The product family includes the following models:
NSnappy Sense LWEU-N: thermometer equipped with an 80 mm long, 2 mm diameter stainless-steel
probe with a sharp needle tip. This model is intended for measuring the internal temperature of soft,
penetrable products like food.
NSnappy Sense IR LWEU-N: non-contact thermometer equipped with an infrared (IR) sensor. This
model is intended for measuring the surface temperature of objects without touching them.

3 - Sense LWEU Series
Installation
These devices themselves don’t require any specific installation. They are portable instruments. Upon
shipping, they are automatically registered to the NSnappy service and are ready for use.
Connections
Sense LWEU-N series models use a LoRaWAN wireless connection to send the data to the
cloud-based NSnappy service. For the LoRaWAN radio reception to work, an NSnappy Hub 4G
LWEU-N gateway device needs to be installed on all sites where these instruments will be used.
Please refer to the manual of the hub device for its installation instructions.
Usage
Please refer to the NSnappy user guides for complete instructions on preparing and using the
NSnappy service for measuring with Sense LWEU-N series devices.
In short, follow these steps to take a measurement with a Sense device to the NSnappy service:
1. Log in to your NSnappy service account.
2. Navigate to the Tasks view.
3. Either select Enter new measurement or start performing a task that contains entering
a measurement result.
4. Turn on the device by briefly pressing its power button.
5. Blue LED light on the device starts blinking in bursts of two blinks. This means the device
is searching for a wireless LoRaWAN connection.
6. When the device is connected to the NSnappy Hub device, the blue LED blinks steadily. It
can take a few seconds to connect. Note that the device will turn off automatically after 3
minutes to save the battery. If this happens, restart and reconnect the device simply by
pressing its power button again.
7. Measuring results start updating on the screen in the NSnappy service.
8. Start measuring. Refer to model specific measuring instructions below.
9. When the reading has stabilized, press the power button on the device or click the Pick
measurement button on the screen. This locks the measurement reading.
10. Enter possible additional information and signature to the NSnappy service and save the
measurement / execute the task.
11. The measurement is ready and data is saved to the NSnappy service.

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Measuring with NSnappy Sense
Push the sensor probe carefully into the product at least 30 mm deep. Do not use excessive
force, do not for example try to push the probe into a frozen or hard product. Be careful also
when penetrating plastic foils or similar surfaces. The sensor probe can be damaged or bent if
you use excessive force on it.
Wait until the reading has sufficiently stabilized. Note that it can take a few seconds before the
readings start updating in the NSnappy service.
You can speed up the measuring process by pushing the probe into the product before the
actual measuring process. This way the temperature starts to stabilize even before the first
readings appear on the screen.
Measuring with NSnappy Sense IR
Point the lens of the IR sensor directly towards the target object. Measuring distance should be
between 5 to 20 cm. The smaller the target is the shorter the measuring distance should be. The
distance should be at most 4 times the smallest dimension of the target object. The surface of
the target object must be matte or rough in texture and it should not gleam or reflect light.
Shiny or transparent objects cannot be accurately measured.
The reading should stabilize in seconds, but note that it can take a few seconds before the
readings first start updating in the NSnappy service. If the result is not what was expected, make
sure that the measuring distance is as short as possible. Measurement error of couple of
degrees is possible depending on the surface properties of the target object.

5 - Sense LWEU Series
Maintenance
NSnappy Sense series devices are delicate measuring instruments that need to be handled with
care. Even though the case is made of durable plastics and silicone, the sensor probe or internal
electronics can be damaged by drops or hard impacts. If there is any suspicion that the device is
damaged, send it to be checked and serviced.
Replacing the battery
The devices are powered with a 3.6 V Lithium Thionyl Chloride battery pack. The battery is not
user replaceable. Annual service and calibration subscription is available for these devices and
they include a periodic calibration of the sensor and battery replacement. Under normal use and
conditions, the battery will last for at least a year. If needed, send the device to service for
battery replacement.
Cleaning
It is important to keep the device and especially the sensor probe or lens clean. Clean the device
using a soft, non-abrasive cloth moistened with a mild detergent solution. Be careful not to
scratch the IR sensor’s lens.
Do not use any abrasive devices or substances when cleaning.
Do not clean the device in a dishwashing machine.
Service
There are no user serviceable parts in these devices. If the device needs service, contact your
NSnappy service partner for more.
Troubleshooting
The readings do not appear or update in NSnappy
1. Check that the LED blinks. If the LED is not blinking at all after pressing the power
button, send the device for service as the battery might be empty.
2. Check that the blue LED on the device switches from blinking in bursts of two to blink
single blinks. This indicates that the device has connected to the hub device.
3. If the device keeps blinking in bursts of two blinks, check that there is an NSnappy Hub
LWEU-N device for a wireless LoRaWAN connection installed on the site and that you
are using a Sense LWEU-N device within a reasonable range from it. Typical range of the
LoRaWAN wireless connection indoors is from tens to hundreds of meters, depending on
the materials of the building structures.

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4. If the LED blinks single blinks but the readings are not updating in NSnappy, check the
serial number of the Sense device and make sure that the same serial number can be
found from the Settings →Devices view of the NSnappy service.
The readings appear to be too high or too low with Sense
1. Make sure that you have inserted the probe deep enough.
2. Make sure to wait long enough for the readings to stabilize. It can take up to a minute for
the readings to properly stabilize.
3. Check the condition of the sensor probe. If the probe is bent or appears otherwise
damaged, it could give incorrect readings.
The readings appear to be too high or too low with Sense IR
1. Make sure that you are pointing the lens directly to the target.
2. Make sure that you are measuring from as close as possible to the target without risking
touching the target or getting the lens dirty.
3. Make sure that the object you are measuring is not shiny or transparent. You cannot
accurately measure the temperature of shiny or transparent objects with Sense IR.
4. Even a transparent plastic foil between the IR sensor and the actual target may distort
the temperature readings. If possible, remove any plastic foils before measuring.
The reading only updates with a few second intervals
This is normal. The Sense LWEU-N devices send the data to the NSnappy service with an interval of few
seconds.

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Specifications
Environment
Storage conditions -40…+60°C, relative humidity 5-95%, non-condensing
Operating conditions Sense: -20...+45°C, relative humidity 0-100%
Sense IR: -20...+45°C, relative humidity 5-95%, non-condensing
Protection class IP65
Enclosure material PC+ABS (Bayblend® T88-4N)
Dimensions
Dimensions Sense: 224 x 28 x 23 mm
IR: 119 x 28 x 23 mm
Temperature measurement probe (Sense)
Probe 80 mm long, 2 mm diameter, hollow stainless steel probe with sharp tip
Sensor Pt100 sensor element inside of the probe tip
Measuring range -50…+200°C (theoretical Pt100 linearized range -200...+600°C)
Accuracy ±0,5 °C within range -30…+100 °C, when device temperature is +5…+45°C and
stable
Measuring interval About 5 seconds
IR temperature measurement (Sense IR)
Sensor Gradient-compensated thermopile infrared temperature sensor with integrated
optics
Mesurement beam 12°, practical measurement distance 5…20 cm
Target emissivity Fixed 0,95
Measuring range -70…+380°C
Accuracy ±1 °C within range -20…+100°C, when device temperature is +5…+45°C and
stable
±2 °C within range -40…+120°C, when device temperature is +5…+45°C and
stable
Measuring interval About 5 seconds
Radio connection
Description LoRaWAN standard, EU 868 MHz frequency range
Transmitter module Murata ABZ-093 LoRaWAN modem
Antenna Internal
Compatibility Nokeval NSnappy Hubs and Cloud Service
Frequency 863-870 MHz (LoRaWAN 1.0.2 EU band)
Power Max +14 dBm E.R.P.
Range Depends on environment, indoors: in good conditions up to hundreds of meters,
outdoors: line-of-sight up to 10 km
Power supply
Type 3.6 V lithium thionyl chloride primary battery, not user replaceable
Battery life At least 1 year with 20 minutes of use per day

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Warnings
Warning! This device contains a license-free ISM band (868 MHz) SRD radio transceiver.
Observe local regulations concerning the use of such radio transmitters. Never start or
use this device near explosion hazard areas or in areas where the use of radio
transmitters has been limited, such as in airplanes, near medical instruments, near
flammable liquids or chemicals or near explosion work sites.
Do not leave the device in direct sunlight or some other place, like in a parked car,
where temperature can rise to over +50°C. The battery may overheat and cause fire or
explosion hazard.
Read this manual carefully before using the device.
Only Nokeval authorized services may repair or modify the device. The device contains
no user serviceable parts.
The device must not be disposed of in household waste. Observe local regulations
concerning the disposal of electrical waste. The device contains a battery.
Trademarks
All trademarks mentioned are the legal property of their respective owners
Manufacturer
Nokeval Oy
Rounionkatu 107
FI-37150 Nokia
Phone: [phone] (Mon-Fri 8:30-16:00 EET)
https://nokeval.com/
Email [email protected], suppor[email protected]