YOSensi YO Refrigerant Monitor User manual

YO Refrigerant Monitor
User guide v1.2

YO Refrigerant Monitor User guide v1.2
page 2/29
Release notes
Released
Version
Key changes
05.09.2022
1.0
Initial release.
20.07.2023
1.1
Added configuration with Yosensi Management Platform for
devices with firmware with 3.4.0 and newer. Changed
description of connecting nodes with Yosensi Management
Platform.
26.10.2023
1.2
Added configuration with Yosensi Mobile App
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 3/29
Content
Release notes 2
Content 3
Product description 4
Overview 4
Physical interfaces 5
LEDs 5
Buttons 5
Specifications 6
Physical 6
Operating conditions 7
Measured values 7
Pressure 7
Internal Temperature and relative internal humidity 9
Battery condition 10
Installation 11
Package contents 11
Safety precautions 11
Installation guide 12
Operation 16
IoT system components 16
Device configuration 17
Configurable parameters 17
Parameters description 19
Configuration node with Yosensi Management Platform 21
Configuration node with Yosensi mobile app 22
Connecting node with network 23
Yosensi Management Platform configuration 23
Adding a node manually 23
Adding node via Bluetooth 26
Payload description 27
Compliance statements 28
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 4/29
Product description
Overview
The YO Refrigerant Monitor is a device used to measure pressure in installations where pressure
occurs. The device provides data on the pressure in the installation. Based on this information, it is
possible to verify the correct functioning of the installation and prevent potential damage and loss of
materials and products that this installation maintains.
Figure 1 Device top view.
Device sticker placed on the right side of the device enclosure contains information about model,
version, LoRaWAN region and 3 parameters important in case of device identification and
configuration:
-DEV EUI: 64-bit unique device identifier in a LoRaWAN network,
-DEV ADDR: address required to connect via ABP activation type to LoRaWAN,
-BLE MAC: bluetooth physical address.
Figure 2 Device label.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 5/29
Physical interfaces
LEDs
YO Refrigerant Monitor communicates its current behaviour to the user by RGBW LED placed on
the top.
DIODE STATUES INTERPRETATION
BEHAVIOUR
COLOUR
DEVICE STATUS
Single flash
Green
General: device is working correctly (power and memory).
Single flash
Red
General: device is working incorrectly (power and memory).
LoRaWAN communication: failed to receive an
acknowledgement from LoRaWAN Server within specified
timeout.
Single flash
White
LoRaWAN communication: LoRaWAN frame sent \
confirmation from LoRaWAN Server after receiving the frame.
Slow flashing
Blue
BLE communication: connection to the device via BLE
(configuration).
Rapid flashing
Blue
LoRaWAN communication: connecting to LoRaWAN network.
Buttons
YO Refrigerant Monitor is equipped with one reset button inside the device on the PCB board next
to the RGBW LED diode .
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 6/29
Specifications
Physical
Figure 3 Dimensions of the device.
PHYSICAL SPECIFICATION
Dimensions
Height: 42 mm
Width: 88 mm
Depth: 64 mm
Colour
Light grey
Mounting method
Horizontal
Vertical (can be screwed to the wall)
Enclosure material
ABS
Level of protection
IP67
Weight
326,5g
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 7/29
Operating conditions
OPERATING CONDITIONS
Temperature
0° to 70°C
Humidity
0 to 90%
Placement
Indoor use
Power supply
3 x LR6 (AA) battery (3 x 1,5 V)
Power consumption
Maximum 120 mA DC (4,5 V DC)
Input signal
Digital I2C
Measured values
MEASUREMENT RANGES
Parameter
Measuring range
Accuracy
Pressure
10, 20, 50, 100 bar
±1% (at temperatures from
-20 °C to 85°C)
Temperature (internal)
-40°C to 125°C
±0,2°C (from 5°C to 60°C )
Relative humidity (internal)
0% to 100%
±2% (at 20% to 80% )
Temperature (sensor)
-20°C to 70°C
From 0,5% FS to 1% FS
Pressure
The device provides data on the pressure in the installation. Based on this information, it is possible
to verify the correct functioning of the installation and prevent potential damage and loss of
materials and products that this installation maintains. YO Refrigerant Monitor is able to work with
different models of pressure sensors, please contact Yosensi if you are interested in implementing a
different sensor than the recommended one.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 8/29
Figure 4 Sensor pressure monitoring chart.
Figure 5 Sensor temperature monitoring chart.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 9/29
Internal Temperature and relative internal humidity
Temperature and relative humidity are measured by sensors placed inside the device enclosure.
These measurements can be used to monitor if the device is working in recommended conditions.
Figure 6 Internal temperature exemplary chart.
Figure 7 Internal humidity exemplary chart.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 10/29
Battery condition
Battery voltage is used to monitor its condition – to spot anomalies (like sudden drop) or its current
condition based on voltage drop over time in comparison to initial voltage rating.
Figure 8 Battery voltage exemplary chart.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 11/29
Installation
Package contents
1. Device (without batteries).
2. Warranty card.
3. Wrench (25 mm / 1”).
4. 4-pin electrical connector.
Safety precautions
SAFETY PRECAUTIONS
SYMBOL
DESCRIPTION
Device is marked with a symbol saying that electrical and electronic
products may not be mixed with unsorted household waste. Remember
that batteries used to power the device must be treated at a specialized
treatment facility.
Remember about possible electrostatic discharge when replacing battery,
connecting input or doing some other operations near inside electronics.
Be careful while handling the device – dropping it may cause damage that will
affect the sensors and other electronics inside.
When installing the device on the wall remember to wear adequate protective
equipment.
To maintain the level of protection device cover screws must be properly
tightened. Device shouldn’t be used without cover.
Any actions inside the device's enclosure (excluding replacing batteries) must
be performed by trained personnel only.
Clean the device only with damp cloth.
Device is intended for outdoor and indoor use. Make sure that device is not
exposed for long term UV rays and in an environment in the immediate
vicinity of water which may flood the device.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 12/29
Installation guide
1. Unscrew the device: remove 4 screws from the enclosure.
Figure 9 Device opening instructions.
2. Unscrew the cable gland nut and remove the cap.
Figure 10 Device with removed top cover and PG7 cap marked.
3. Pass the pulse counting cable through the cable gland.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 13/29
Figure 11 Input cable passing through the cable gland instructions.
4. Press the spring contact and insert the appropriate wire into the corresponding slot in the
connector: VCC - brown wire
SDA - black wire
SCL - white wire
GND - blue wire
Tighten the cable gland to immobilize the external sensor wires and maintain tightness.
Figure 12 Connecting input cable instructions.
5. Screw the sensor into the installation with a wrench (25 mm / 1”).
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 14/29
Figure 13 Connecting sensor instructions.
6. Plug and screw the 4-pin electrical connector into the sensor.
Figure 14 Connecting sensor instructions.
7. Place three LR6 batteries in the device according to the polarity indicated on the battery
holder.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 15/29
Figure 15 Battery placement instructions.
8. Assemble the device and screw it back together.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 16/29
Operation
IoT system components
Typical IoT systems consist of 3 main elements (Figure 16), brief described below. In order to set
communication, each element must be properly configured.
1. Node – device with sensors and a wireless communication module that gathers data, forms
the payload and sends it to the gateway.
2. Gateway – device similar to routers, equipped with a LoRa concentrator, that receives LoRa
packets and send them to the Internet-connected server.
3. Server – in most cases, a cloud-based service where data is processed, stored, analysed, and
presented in user-friendly ways (via a user interface); Yosensi default and recommended
tools are Yosensi Management Platform (for IoT structure management) and Grafana (for
data presentation).
Figure 16 IoT system components.
Figure 17 Fresnel zone where communication between two antennas can occur.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 17/29
Device configuration
Configurable parameters
A few parameters must be set before sending data to the gateway. The default firmware is configured
in OTAA mode with predefined deveui,appkey (OTAA)and appskey,nwkskey (ABP).
Configuration of the device is stored in a JSON file divided into the following sections:
-info (generic, read only): information about the device,
-lorawan (generic): configuration data for LoRaWAN connection,
-ble (generic): bluetooth settings,
-device (dynamic): individual configuration for a specific device (this section’s structure differs
for each device),
Sample configuration file for the YO Refrigerant Monitor device.
{
"info": {
"devmodel": "LNFM",
"fwver": "3.6.1",
"loraradio": "SX1261",
"lorawanver": "1.0.2",
"loraregion": "EU868",
"blemacaddr": "0123456789ab"
},
"lorawan": {
"subband": 1,
"nwktype": "public",
"acttype": "otaa",
"otaa": {
"deveui": "0123456789abcdef",
"appeui": "fedcba9876543210",
"appkey": "000102030405060708090a0b0c0d0e0f",
"trials": 3
},
"abp": {
"devaddr": "01234567",
"nwkskey": "0123456789abcdef0123456789abcdef",
"appskey": "000102030405060708090a0b0c0d0e0f"
}
},
"ble": {
"power": 0,
"interval": 1600
},
"device": {
"measinterval": 600,
"pressurerange": 50
}
}
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 18/29
GENERICS PARAMETERS
SECTION
NAME
DESCRIPTION
POSSIBLE
VALUES
DEFAULT
VALUE
READ/
WRITE
info
devmodel
Device name
-
LNFM
R
fwver
Firmware version
-
3.6.1
R
loraradio
Radio chipset model
-
SX12611
R
lorawanver
LoRaWAN stack version
-
1.0.2
R
loraregion
LoRaWAN region
-
EU8681
R
blemacaddr
Bluetooth LE address
-
predefined
R
lorawan
subband
Uplink subband number
Table2
predefined
R/W
nwktype
Network type
public,
private
public
R/W
acttype
Activation type
otaa, abp
otaa
R/W
lorawan
-otaa
deveui
Device EUI (Extended
Unique Identifier)
8 B (HEX)
predefined
R/W
appeui
Application EUI
8 B (HEX)
predefined
R/W
appkey
Application Key
16 B (HEX)
predefined
R/W
trials
Join request trials
1-9
3
R/W
lorawan
-abp
devaddr
Device Address
4 B (HEX)
predefined
R/W
nwkskey
Network Session Key
16 B (HEX)
predefined
R/W
appskey
Application Session Key
16 B (HEX)
predefined
R/W
ble
power
Bluetooth LE transmit power
[dBm]
04
0
R/W
interval
Bluetooth LE advertising
interval [ms]
MS_INPUT3
1600
R/W
1LoRa radio chipset used defines the LoRaWAN region: SX1261 - EU868; SX1262 - AU915, US915, AS923
2Uplink subband list for specific LoRaWAN regions - UPLINK SUBBAND Table.
3Calculation formula: MS_INPUT = INTERVAL_MS × 1.6.
4Change currently not supported.
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 19/29
DEVICE PARAMETERS
NAME
DESCRIPTION
POSSIBLE
VALUES
DEFAULT
VALUE
READ/
WRITE
measinterval
Measuring and sending interval
LoRa [s]
120–999999
1800
R/W
pressurerange
Range setting for each pressure
sensor
10,20,50,100
50
R/W
Parameters description
-nwktype: used for setting the device in public or private network type.
-acttype: used for setting the device in ABP or OTAA mode.
-deveui, … , appskey: predefined addresses and keys, these parameters are generated using
multiple IDs specific to the particular MCU and are unique for each device.; they can be
changed if needed.
-interval: determines the interval of sending broadcast packets, used to connect to every BLE
receiver around the device.
-subband: used for setting the communication frequency sub-band in LoRaWAN.
-measinterval: measurement interval [s] between sending LoRa packets.
-pressurerange: depending on used sensor, returns measured value of the pressure in range
from 0 to 10/20/50/100 bar
www.yosensi.io

YO Refrigerant Monitor User guide v1.2
page 20/29
UPLINK SUBBAND
REGION
DESCRIPTION
POSSIBLE
VALUES
DEFAULT
VALUE
READ/
WRITE
EU868
Sub-band 1; 867.1 - 868.5 MHz; channels 0-7
1
1
R
US915
Sub-band 1; 902.3 - 903.7 MHz; channels 0-7
1
2
R/W
Sub-band 2; 903.9 - 905.3 MHz; channels 8-15
2
Sub-band 3; 905.5 - 906.9 MHz; channels 16-23
3
Sub-band 4; 907.1 - 908.5 MHz; channels 24-31
4
Sub-band 5; 908.7 - 910.1 MHz; channels 32-39
5
Sub-band 6; 910.3 - 911.7 MHz; channels 40-47
6
Sub-band 7; 911.9 - 913.3 MHz; channels 48-55
7
Sub-band 8; 915.5 - 914.9 MHz; channels 56-63
8
AU915
Sub-band 1; 915.2 -916.6 MHz; channels 0-7
1
2
R/W
Sub-band 2; 916.8 - 918.2 MHz; channels 8-15
2
Sub-band 3; 918.4 - 919.8 MHz; channels 16-23
3
Sub-band 4; 920.0 - 921.4 MHz; channels 24-31
4
Sub-band 5; 921.6 - 923.0 MHz; channels 32-39
5
Sub-band 6; 923.2 - 924.6MHz; channels 40-47
6
Sub-band 7; 924.8 - 926.2 MHz; channels 48-55
7
Sub-band 8; 926.4 - 927.8 MHz; channels 56-63
8
AS923
Sub-band 1; 922.0 -923.2 MHz; channels 0-8
1
1
R/W
Sub-band 2; 923.2 - 924.5 MHz; channels 9-17
2*
2* change is not supported
www.yosensi.io