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NSnappy Wash

Introduction

NSnappy Wash is a temperature transmitter that has been specially designed for the temperature profiling of professional dishwashers. The device is user friendly since most of the operation is automated. The collected dishwashing temperature profile is transmitted to the NSnappy cloud service using wireless LoRaWAN radio technology.

Installation

NSnappy Wash is ready to use when supplied from the factory. Upon shipping, it is automatically registered to the NSnappy service.

Connections

NSnappy Wash uses the LoRaWAN wireless connection standard on the European 868 MHz radio frequency band to send the data to the cloud-based NSnappy service. There is a fixed radio antenna inside the enclosure of the device. Before using the 868 MHz radio, make sure it is legal in your country.

For the LoRaWAN radio reception to work, a NSnappy Hub-4G-LWEU gateway device needs to be installed on all sites where these devices will be used. Please refer to the manual of the hub device for its installation instructions.

Usage

Please refer to the NSnappy user manual for complete instructions on preparing and using the NSnappy service for measuring with NSnappy Wash LWEU-N.

Operation

The temperature profiling of the dishwasher is done by simply placing the NSnappy Wash onto a dishwasher tray and running the tray through the dishwashing process as any other tray. The device activates from movement when it is picked up from storage and captures the temperature profile during the washing cycle. The operation of the device consists of the following three phases:

Phase 1: Idle

In idle phase, the device is not actively measuring the temperature. However, the device is sensing its movement trying to determine when it is picked up. Once the device is moved, it switches to the start phase.

While in idle mode, the device will send the temperature profile data collected from the previous wash cycle from its memory buffer if there is any. The radio transmissions are delayed when the device is in the measuring phase (or switches into it).

Phase 2: Start

In start phase, the device measures the temperature in one second interval. If the measured temperature rises above +40°C the device switches to the active phase. If the measured temperature does not rise over +40°C within 10 minutes from the last detected movement, the movement is recognized as a false start. After the false start, the device discards the collected data from that run and moves back to idle phase.

Phase 3: Active

If the movement is recognized as a wash cycle start, the device moves to active phase and continues to collect data until the wash cycle end is recognized or the timeout ends the active phase. The wash cycle is considered to end when the measured temperature drops back below +40°C for 30 consecutive seconds. If the temperature does not drop, the timeout functionality will terminate the wash cycle after 15 minutes of continuous measuring in order to save the battery.

Temperature measurements from the beginning of the start phase to the end of the active phase are compressed to form the temperature profile. The compression is done by storing only the maximum temperature value from each 5 second period. Once the measuring is completed, the temperature profile is stored in memory buffer and the device switches back to idle phase and the data transmission starts.

Status LEDs

NSnappy Wash has a two-colored status LED next to the sensor element. The LED indicates the state of the device with blinking interval and color.

Blinks with 2,5 second intervals indicate that the device is in the measuring phase and is collecting data.

Faster blinks indicate that the device is unloading its buffer through the radio.

Green color indicates that everything is good. Red color indicates that the estimated battery pack capacity has dropped below 5%. Red colored blinks also have a slightly longer on-time.

Maintenance

NSnappy Wash needs no maintenance since the battery pack is not user replaceable and the device should stay clean with normal usage. When the battery pack runs out, the device should be disposed of appropriately or returned to the manufacturer.

Specifications

Wash

Environment

Storage conditions

-40…+40 °C, stationary, relative humidity 5-95%, non-condensing

Operating conditions

0...+90 °C, during max 15 min wash cycle

Protection class

IP68

Enclosure material

PC+ABS

Dimensions

Dimensions

107mm x 68mm x 27mm

Weight

0.2 kg

Temperature measurement

Sensor

Pt1000 Class B

Measuring interval

1 second, only max value from each 5 second period is transmitted

Measuring range

-30...+90 °C

Measuring accuracy

±1°C within +30…+90°C

User interface

Power LED

Blinking green: operating
Blinking red: operating, less than 5% battery remaining

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

3.6V Lithium Thionyl battery pack (3 x AA size)

Battery life

5 years with 20 min usage per day

Declaration of Conformity

Warnings

This product 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 product in direct sunlight or any other place, like in a parked car, where the temperature can rise to over +50°C. The battery may overheat and cause a fire or explosion hazard.

Read this manual carefully before using the product. Misuse may damage the product or cause other harm. Nokeval assumes no responsibility for any damages caused by inappropriate use or handling of the product.

Only Nokeval authorized services may repair or modify the product. The product contains no user serviceable parts.

The product must not be disposed of in household waste. Observe local regulations concerning the disposal of electrical waste. The device may contain a battery.

Trademarks

All trademarks mentioned and any logos reproduced in this documentation are the legal property of their respective owners. Nokeval and NSnappy are registered trademarks of Nokeval Oy.

Manufacturer

Nokeval Oy
Rounionkatu 107
FI-37150 Nokia, Finland

Phone: +358 3 342 4810
WWW: https://www.nokeval.com
Email: support@nokeval.com

Business ID: 2852422-8

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