dezem HarvyLR-36 IoT Sensor User Manual
- October 30, 2023
- dezem
Table of Contents
IoT sensor HarvyLR
User manual and technical data of the
LoRaWAN sensors HarvyLR-36 and HarvyLR-360
© 2023 deZem GmbH
Version 2.2 Feb 2023
deZem GmbH
Wilmersdorfer Str. 60, 10627 Berlin
Phone: +49 30 31 800 730
Fax: +49 30 31 800 731
contact@dezem.de
www.dezem.de
Introduction
Please read the following information carefully.
Keep the manual or pass it on to other users of the product. Visit our website
www.dezem.de with the respective website belonging to the product. There you
may find further information about the product.
This product complies with the legal, national and European requirements. All
company names and product designations contained herein are trademarks of
their respective owners. All rights reserved.
Safety instructions
The device complies with electrical protection class III.
- To maintain the protection class III, only external sensors/power sources which also comply with SELV (safety extra-low voltage) requirements – protection class III – may be connected to the device.
- Avoid shocks or impacts.
- If the housing or cable is damaged, please contact deZem GmbH and do not install the affected device.
- Do not connect deZem clamp-on current transformers to uninsulated or damaged cables.
- The product must be installed professionally and in accordance with the specified installation guidelines.
- Installation may only be carried out by appropriately qualified personnel.
- For safety and approval reasons, unauthorised conversion and/or modification of the product is not permitted.
- Maintenance, adjustment or repair work may only be carried out by a specialist or a specialist workshop that is familiar with the associated dangers and the relevant regulations.
- Do not expose the product to extreme temperatures, direct sunlight or strong vibrations. Protect the product from dust and dirt.
Product description
3.1 Product designation
Type | HarvyLR-36 | HarvyLR-360 |
---|---|---|
Shunt value | 1 Ohm (+/- 1 %) | 0.091 Ohm (+/- 2 %) – 1 Ohm und 0.1 Ohm in |
parallel
Max. input| 25 mA AC
36 mA DC| 250 mA AC
360 mA DC
- when using these transformer types protection class II is valid
In the following, the general short designation “HarvyLR” refers to both product variants.
LoRaWAN® and the LoRAWAN® logo are trademarks and are used under licence from the LoRa Alliance®.
3.2 Intended use
HarvyLR is used for wireless acquisition of AC and DC currents via LoRaWAN and
it is self-powered, i.e. it does not require an external power supply or
battery. It is particularly suitable for the acquisition of RMS currents using
the deZem clamp-on current transformers as well as industrial 4–20 mA output
signals. The intelligent event filter inte- grated in the sensor provides
metering t series (inrush currents, etc.) accurate to the second at a defined
maximum rate.
Any application other than described above, as well as modifications to the
product, are considered improper use and may impair the protective effect.
Functional Description
The HarvyLR records AC and DC currents via LoRaWAN. The intelligent event
filter integrated in the sensor provides metering series (inrush currents,
etc.) accurate to the second at a defined maximum rate. Even a signal current
(AC or DC) of only 0.15 mA on average is sufficient to record and send metered
values every 10 minutes on average. Even higher data rates are possible with
larger input currents.
Optionally, the HarvyLR can be integrated into the deZem DataSuite, see
chapter 5.3. There, its metered value histo- ries are immediately available
online for further purposes.
Metering interval
Isec (avg-long) | Metering interval |
---|---|
<= 30 mA OR Vsys > FastSampleLevel | 1 sec. |
>= 20 mA | 3 sec. |
>= 10 mA | 5 sec. |
>= 5 mA | 10 sec. |
>= 2 mA | 20 sec. |
Else | 30 sec. |
LoRaWAN Payload encoding (Port 1)
Name
| Type| Bytes| Description| Example|
Value range
---|---|---|---|---|---
Version| uint8[3]| 0–2| Firmware version| 1, 5, 1 v1.5.1|
Shunt Value| uint8| 3| Value of shunt resistance on hw 1/10 Ohm| 10 1 Ohm
1 0.1 Ohm|
Amplifier Gain| uint8| 4| Gain, typical 100x| |
Vsys (current)| uint16| 5–6| System voltage or charge of 0.47 F su- percaps;
system voltage in 1/10 mV| 29470
29 47 mV
2.947V| <= 3600 mV
Vsys (min)| uint16| 7–8| Minimum system voltage since last LoRaWAN uplink
package; systemvoltage in 1/10 mV| |
Vsys (max)| uint16| 9–10| Maximum system voltage since last LoRaWAN uplink
package; system voltage in 1/10 mV| |
Vamp (rms)| uint16| 11–12| Output voltage (RMS value) of ampli- fier (x100
Gain) in 1/10 mV| 35991 3.5991 V|
Isec (current)| uint16| 13–14| RMS current (calculated from shunt value and
Vamp);
Secondary current CT in 1/100 mA| 3101
31.01 mA 12034
120.34 mA| 0…36 mA (1 Ohm)
0…360 mA (0.1 Ohm)
Isec (avg-long)| uint16| 15–16| Moving Average Filter since Power Up above
Isec (current); calcula- tion (exponent=4): Filtered Value = (15 * oldValue +
newValue) / 16; secondary current CT in 1/100 mA| | “
Isec (avg- short)| uint16| 17–18| Average value filter with Reset at last
LoRaWAN upload (max. 600 values); secondary current CT in 1/100 mA| | “
Name
| Type| Bytes| Description| Example|
Value range
---|---|---|---|---|---
Isec (min)| uint16| 19–20| Minimum secondary current since last LoRaWAN uplink
package; secondary current CT in 1/100 mA| | “
Isec (max)| uint16| 21–22| Maximum secondary current since last LoRaWAN uplink
package; sec- ondary current CT in 1/100 mA| | “
Meas. Counter| uint16| 23–24| Number of measurements since last LoRaWAN
upload| 0x000f 15 Meas- urements since last uplink| x (uint32)
Last upload| uint16| 25–26| Seconds since last upload/duration of creating
average value; Time in seconds since last uplink| | x seconds
Temp| int16| 27–28| Temperature in 1/10 °C; nRF52832 temp sensor +-5°C
accuracy;| |
Power Loss?| uin8| 29| 1= Power Loss detected
0 = No Power loss detected; when Isec < 0.75 mA| |
Installation
5.1 First time charging of HarvyLR
Prerequisite: HarvyLR is set up on a LoRaWAN server (e.g. deZem IoT
platform, i.e. deZem.io).
- For initial charging, we recommend connecting the HarvyLR to the computer via the optional USB adapter As soon as values are transmitted from the sensor to the LoRaWAN server, the HarvyLR is sufficiently charged. The charging time is max. 6 min. when using the USB adapter cable.
- Disconnect the HarvyLR from the computer and remove the USB adapter cable.
Alternatively, the sensor can also be connected directly without charging
beforehand, as described in the next sec- tion. In this case, approx. 2 mAh
are required for charging. Depending on the primary current, it may take a
different amount of time until the HarvyLR transmits values for the first
time.
5.2 Connecting the sensor
- Connect the HarvyLR to the appropriate deZem clamp-on current transformer for an RMS current measurement or to the adapter cable (for 4–20 mA signals). The sensor housing can be operated freely suspended or fixed with cable ties.
HINT
For the 4-20 mA signal there is no need to pay attention to the polarity.
WARNING
NEVER connect a clamp-on current transformer to a conductor unless it is
connected to the HarvyLR or other terminal device. Otherwise, high voltages
may build up at the transformer output. It is imperative that additional
insulation is fitted between the conductor and the clamp-on current
transformer in order to comply with the above-mentioned SELV requirements (cf.
chapter 2, Safety instructions) of sensors/current sources connected
externally to the device.
5.3 Configuration in deZemAd
Type of current transf.| Max. primary current
[in A]
| Min. primary current [in A]| Nominal secondary current [in mA]|
Current ratio| Max. wire-Ø [in mm]| Max. wire cross-sect. [in
mm²]| | Scale factor deZemAd
---|---|---|---|---|---|---|---|---
| HarvyLR-360| HarvyLR-36| deZem clamp-on current transformers
T80| 80| 50| 0,8| 40| 2000| 5,6| 25| 2
T80/26,6| 80| 75| 1| 26,7| 3000| 5,6| 25| 3
T150/40| 150| 94| 1| 40| 3750| 8| 50| 3,75
T300| 300| 30| 0,9| 250| 1200| 13,8| 150| 1,2
T300/40| 300| 188| 1,6| 40| 7500| 13,8| 150| 7,5
T500| 500| 50| 0,8| 250| 2000| 19,5| 300| 2
T500/40| 500| 312| 2,8| 40| 1250| 19,5| 300| 12,5
| 4 –20 mA analog signals| | 0,001
Disposal
In Germany and for products delivered directly from Germany: All devices must
be disposed of in an orderly manner. Due to the applicable regulations, the
electrical and electronic devices of deZem GmbH may not be disposed of via the
public collection points for electrical devices. The complete electronic
devices of deZem GmbH must be returned to us for disposal. The prepaid
delivery must be sent to the following address:
deZem GmbH, Wilmersdorfer Str. 60, 10627 Berlin.
In countries of the European Union outside Germany: Information on the correct
disposal can be obtained from your dealer or the responsible sales department.
Technical Data
Type | HarvyLR-36 | HarvyLR-360 |
---|---|---|
Housing dimensions | HxWxD: 22x69x49 mm | |
Weight | 50 g | |
Power supply | Self-powered, Input voltage max. 3 V | |
Input current | 0–25 mA AC | |
0–36 mA DC | 0–250 mA AC |
0–360 mA DC
Connection| 1x JST-socket, suitable for deZem clamp-on current transformers
IoT protocol| LoRaWAN v1.03, Class A Device, EU863-870 Mhz
Permissible ambient conditions| Temperature: 0–55 °C
Humidity: 30–60 % Protection type: IP20
Permissible transport conditions| Temperature: -10–55 °C
Humidity: 20–70 %
HarvyLR Default paramete
Name
| Typ|
Bytes
---|---|---
ShuntVal| 1000| Shunt resistance in [mOhm] When set to 100, actually 91 is
used!
TxMinInterval| 900| Min. LoRaWAN upload interval in [s]
LoRaLevel| 3100| Min. voltage level for regular LoRaWAN uploads in [mV]
ColdStartEndLevel| 2700| Min. voltage level for the end of initial cold start
in [mV]. As soon as once
Vsys > ColdStartEndLevel, the sensor starts measuring
ExpFilterExponent| 4| Exponential filter exponent (2^x), Default: 4 -> 16
IsecBrownout| 500| Isec value in [μA], that considered a “brownout” and sent
via confirma- ble uplink
FastSampleLevel| 3500| System voltage in [mV], when above sample every second
FilterAbs| 180| Absolute Vamp difference in [mV], to trigger uplink
FilterRel| 85| Required relative change of Isys in [%] to trigger instant
upload. Value [1..100] e.g. => +/- 15 %
LogUart| false| Set to „true” to print more detailed logs on UART (needs more
power). Even with „false”, some logs are generated
LoRaWAN Frequencies
Direction
| Frequency| Bandwidth| Modulation| Duty Cycle|
Transmission power
---|---|---|---|---|---
RX + TX| 868.1 MHz| +/- 0.0625 MHz| LoRa| ≤ 1%| ≤ 14 dBm
RX + TX| 868.3 MHz| +/- 0.0625 MHz| LoRa| ≤ 1%| ≤ 14 dBm
RX + TX| 868.3 MHz| +/- 0.0625 MHz| LoRa| ≤ 1%| ≤ 14 dBm
RX + TX| 868.3 MHz| +/- 0.125 MHz| LoRa| ≤ 1%| ≤ 14 dBm
RX + TX| 868.5 MHz| +/- 0.0625 MHz| LoRa| ≤ 1%| ≤ 14 dBm
RX + TX| 867.1 MHz| +/- 0.0625 MHz| LoRa| ≤ 1%| ≤ 14 dBm
RX + TX| 867.5 MHz| +/- 0.0625 MHz| LoRa| ≤ 1%| ≤ 14 dBm
RX + TX| 867.7 MHz| +/- 0.0625 MHz| LoRa| ≤ 1%| ≤ 14 dBm
RX + TX| 867.9 MHz| +/- 0.0625 MHz| LoRa| ≤ 1%| ≤ 14 dBm
RX: receive mode, TX: transmit mode
Support
Do you have any further questions about set-up and operation? Our deZem team will be happy to answer them. Give us a call: +49 30 3180 0730 or write us an email to support@dezem.de.
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>