Press’o sensor

 

Declaration of conformity


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Presentation


The Press’o  sensor is LoRaWAN class A sensor, it manages two different power supplies, one is external and may range from 9V to 24V, the other one is internal on the battery.

The Press’o sensor integrates 2 analog inputs. It  also includes an internal antenna.

presso1

Press’o sensor can be used with First Sensor gauge type CTE/CTU/CTW 8000. The probe should be dimensioned so that the maximum height of the fluid does not exceed the maximum pressure allowed by the probe.

Press’o sensor is also compatible with Huba Control’s level sensing pressure transmitter Type 712.

Family code:

The family code of Press’o devices is: 50-70-017-xxx

Electronic specification

To select the 4-20mA mode or the 0-10V mode, it is necessary to put the switch on the right position.

4-20 mA mode

• In the 4-20 mA mode, the V+ (power supply of the external sensor) is powered on during 120 ms at 10 V.

presso_4_20_ma

• To add an external power supply, make the following connections:

presso_4_20_ma_alim

• It’s possible to make a series connection of the Press’o and another sensor with a 4-20 mA input.

presso_4_20_ma_alim_serie

0-10 V mode

In the 0-10V mode, the V+ (power supply of the external sensor) is powered on during 120 ms at 14V with a max current of 50mA.

presso_0-10v

Installation and use


Installation

The housing is intended to be installed inside or outside a building but to the shelter of a vertical splash water and direct sunlight.

The product is delivered disassembled. This enables the connection to the screw terminals.

Before connecting your cable strands to the product’s screw terminals, you must insert the cable gland’s nut and the seal.

 

cable-gland2

Then connect wires on Inputs  that will be used:

presso_carte

For connectors, it is preferable to use several single wires with a gauge of 20-26 AWG. As the connectors pluck the wires plugged inside at about 4mm of the wire-end , strip the wires on about 5 to 6 mm of their extremity before plugging them into the connectors.

Once the assembly is done, the casing can be closed.

The housing is compatible with the following DIN rail adapter:

din

For more information about the casing, visit: www.spelsberg.com

Propagation radio

In order for the sensor to function correctly, it is better to limit the number of obstacles in order to avoid excessive attenuation of the radio wave, it is also important to put the sensor as high as possible. The press’o sensor has 3 cable glands, they should be positionned horizontally.

propagation-presso

Autonomy


The information in the table below represents how long the battery can last. It is  based on the default configuration at ambient temperature (+25°C) within the optimal use of the sensor throught LoRaWAN network (one uplink frame), and when  the spreading factor used is SF12.

The capacity of the disposable battery is 3.6Ah, 85% of it is used.

Transmission periodicityBattery life
2 frames/ 24 hours+15 years

Human Machine Interface


The Press’o has a buzzer that allows it to “communicate” with the user.

After installing the device, switch ON the power to start-up the device.The buzzer rings until an association.

When the sensor is trying to associate to a network, it emits the following sound:

At the moment of association, the buzzer makes the following sound:

A reed switch (or magnetic switch) is available. It is possible to use a magnet to activate it and make specific actions on the sensor (Switch off, switch on, Re-associtation…).

  • Configuration: « void » frames are sent every minute for 10 minutes.

Standard reports are not functioning during this mode.

Configuration mode
Way to trigger itOne passage of the magnet near the reed switch or specific ZCL command
Way to stop it Another passage of the magnet or specific ZCL command
Effects on the sensor
Time durationThe configuration mode lasts 10 minutes
  • It is possible to ask a ReAssociation procedure if no down frame is received by the sensor during a given periodicity (4 days by default) or if a given number (100 by default) or failure (no acquittement is received) are reached by sending an applicative frame to the sensor or by the IHM of the sensor.

The sensor keeps the AppEUi and DevAddr configured, Confirmed/Unconfirmed  configuration and all applicative configurations. On the other hand, LoRaWAN configuration (channel, datarate …) are lost

ReAssociation Mode
Way to trigger itThree passages of the magnet near the reed switch or ZCL command from LoRaWAN cluster.
Effects on the sensor
  • A factory reset is available on nke Watteco’s sensors. It deletes all the applicative settings saved in the flash memory (i.e.: the configured batches and reports will be deleted).

The sensor keeps the AppEUi and DevAddr configured. On the other hand, LoRaWAN configurations (channel, datarate …) and applicative configurations are lost.

Factory reset
Way to trigger itTwo quick passages and a long passage of the magnet near the reed switch
Effects on the sensor

Applicative layer


Codec are available to decode frame: Downloads

The Press’o device implements “Analog Input” cluster, associated to its Inputs. The link between the connectors and the EndPoint is done below:

ConnectorEnd PointClusterUnit
V+ | M/V-0Analog Input [4-20mA] mA
V+ | V- |M/V-1Analog Input [0-10V] mV

Press’o  integrates the following clusters:

ClusterCluster name Managed attributes
0x0000 BasicAll
0x0050ConfigurationAll
0x8004LoRaWANAll
0x000CAnalog InputAll

Default configuration

A default configuration is set:

  • The device reports each 24 hours the 4-20 mA value  (EndPoint 0 / Cluster Analog Input /Attribut PresentValue) and the 0-10V value (EndPoint 1 / Cluster Analog Input /Attribut PresentValue).

Every change on the default configuration must respect the legal duty cycle. (For example the most restrictive in EU is 0.1%, so in SF12 it is around 1 frame each hour)

Measurement periodicity

The measurement periodicity depends on the minimum recording interval.

If the value of the minimum is 0, then the periodicity is 1 second.

If the value of the minimum is different than 0, then this value is the same as the periodicity.

Frame examples


Standard report

Report

 

Report of the analog value of the connector input 1+/1-

→ Applicative payload is: 11 0a 00 0c 00 55 39  41 50 00 00

11: Fctrl (Endpoint=0)

41 50 00 00: present value ( single precision value =>13)

 

Configuration

 

Configure a standard report on the 4-20mA input

Report immediately the measure of the 4-20mA Input on variation of 1mA. The measure has to be reported at least each hour, and the measure has to be done all 10 minutes.

→The 4-20mA is the End Point 0, Cluster “Analog Input” is 0x000c, Attribut “PresentValue” is 0x0055. The maximum field has to be 0x0e10 to have a report all one hour and the minimum field has to be 0x800a to have a measure all 10 minutes. The delta has to be configured to 0x3f800000 for a report every 1 mA variation.

Applicative payload is: 11 06 00 0c 00 00 55 39 80 0a 0e 10 3f 80 00 00

11: Fctrl (Endpoint=0)

80 0a: minimum reporting interval (10 minutes)

0e 10: maximum reporting interval (1 hour)

3f 80 00 00: reportable change ( 1mA in single precision)

→Response:11 07 00 0c 00 00 00 55

To disable the previous configuration, change the value of the minimum and maximum sending interval and the delta to 0: 11 06 00 0c 00 00 55 39 00 00 00 00 00 00 00 00

 

Batch report

It is recommended to attribute a value of 0.1mV for the resolution in the 0-10V mode, and a value of 0.01mA in the 4-20mA mode.

 

• Configure a batch report on analog input and voltage battery:

Timestamp and record the Voltage of a 0-10V sensor with a resolution of 0.1V, a value has to be saved at least all the 35 minutes or on a rise of 0.5V. Timestamp and record the battery voltage with a resolution of 0.5V, a value has to be saved at least all the 24 hours. All data have to be concatenated and sent at maximum all the 24 hours.

→The EndPoint of 0-10V is 1, cluster « analog input » is  0x000C, and the attribute « PresentValue » is 0x0055

The battery voltage: Cluster « Configuration » is 0x0050, and attribute « Node power descriptor » is 0x0006.

For analog input, the delta is 0x3f000000(0.5mV in single precision), and resolution 0x3dcccccd (0.1mV in single precision).

For the disposable battery power voltage the delta has to be set to 500=0x01F4 (0.5V),the resolution to 500=0x01F4 (0.5V),

There are two different measures to record in the batch, so the tag size has to be 1. Label 0 can be used for analog input and label 1 for the level of disposable Battery

It is necessary to send two frames to configure this batch.

Number of labelTag labelTag size
1 or 20/11
3 or 400/01/11/102
5 or 6 or 7 or 8000/001/010/011/100/101/110/1113
.........

Applicative payload of the present value of the analog input 2+/2-

31 06 00 0c 1d 00 55 00 00 00 80 23 3f 00 00 00 3d cc cc cd 01

31: Fctrl (Endpoint=1)

1d:  0b00011101 => 0001110: size of configuration string after attribute ID (14 bytes)

00 00: minimum recording interval (0 seconds)

80 23: maximum recording interval (35 minutes)

3f 00 00 00:  required delta value (size: 4 bytes for attribute PresentValue => attribute type = 39, 0.5mV in single precision)

3d cc cc cd: required resolution  (size: 4 bytes for attribute PresentValue => attribute type = 39, 0.1mV in single precision)

01: tag value (ob00000001 => 00000: tag label, 001: tag size)

→Response: 31 07 00 0c 00 01 00 55

Applicative payload of the battery voltage

11 06 00 50 15 00 06 04 80 0a 85 a0 01 F4 01 F4 09 

11: Fctrl (Endpoint=0)

15: 0b00010101 => 0001010: size of configuration string after attribute ID (10 bytes)

04: index of required field (Disposable battery)

80 0a: minimum recording interval (10 minutes)

85 a0: maximum recording interval (24 hours)

01 F4: required delta value (size: 2 bytes for attribute Node power descriptor => attribute type = 41, 0.5V)

01 F4: required resolution (0.5V)

09: tag value (ob00001001=> 00001: tag label, 001: tag size)

→Response: 11 07 00 50 00 01 06

To decode the batch reception, use the br_uncompress. Type for analog input is ST_FL (12) and is U16 (6) for the disposable battery power, so it is necessary to use this command:

echo « 26150020e06001d71e0000a0650f » | ./br_uncompress -a 1 0,0.1,12 1,500,6

Result

UNCOMPRESS SERIE

cnt: 5   # Counter of the batch (from 0 to 7)

263     # Timestamp in second of sending of the frame

# Format of data is: TimeStamp of Measure | Label | Value

263 0 0.000000          # TimeStamp: 841 s         Label 0: Analog Input              Value: 0 V

263 1 3000                 # TimeStamp: 811 s         Label 1: Disposable battery      Value: 3.0 V

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