Compact meter
for photovoltaic systems up to 1000 V
Features
PVM-1021
• It can be used for category 1 measurements according to EN 62446-1.
• AUTO mode for performing a sequence of measurements after one press of the START button.
• It converts measured parameters into STC conditions according to EN IEC 60891 by cooperation with the IRM-1 solar radiation
and temperature meter.
• reSYNC function – automatic completion of results with environmental parameters and their conversion to STC conditions after
restoring connection with IRM-1.
• The built-in LoRa radio interface ensures cooperation with the IRM-1 meter over long distances.
• Built-in Bluetooth module for communication with a computer.
• Large measurement memory: 100 objects with 40 cells each.
• Backlit display and buttons.
IRM-1
• Measurement of solar radiation and temperature.
• The LoRa interface for communication with a master meter – offers a larger range than the Bluetooth technology!
• Automatic data synchronization with a master meter with reSYNC function.
• Built-in compass and inclination sensor.
• Built-in recorder that can be used to record solar radiation before constructing PV systems, as well as to measure the shading of
existing systems.
• Large measurement memory: 999 cache memory cells and 5000 recorder records available (one-time recording) with the option
of overwriting them (continuous recording).
Measured parameters
PVM-1021
• The open circuit voltage of the PV panel or a chain of panels, up to 1000V DC.
• RMS voltage of the AC network up to 600 V with frequency measurement.
• Short circuit current of a PV panel or chain of panels – up to 20 A DC.
• Insulation resistance of PV panels – measuring voltage of 250, 500 or 1000 V, simultaneous
measurement of two values: RISO+ and RISO-.
• Insulation resistance of AC circuits – measuring voltage 250, 500 or 1000 V.
• Resistance of protective conductors and equipotential bonding with ± 200 mA current.
Low-current resistance measurement, audible and visual signalling.
• Measurement of PV panels operating current and AC current – all with external
clamp.
• AC/DC power Measurement.
• Diode test with 200 mA current, automatic polarity detection. Test of blocking
diodes with 1000V DC voltage.
IRM-1
• Solar radiation intensity (irradiance) in W/m2 or BTU/ft2h.
• PV panel temperature in °C or °F.
• Ambient temperature in °C or °F.
• Inclination angle of panels
• Orientation of the panels with the built-in compass.
PVM-1021: great capabilities in a small casing
The PVM-1021 is a compact photovoltaic system meter with a substantial number of
measurement functions. The functions are selected with a rotary switch. Additional parameters
are set with buttons located on the housing. All buttons and the graphic display
are backlit, which greatly facilitates operation in shaded places, e.g. when taking
measurements under ground-mounted PV systems. Large memory significantly shortens
preparation of documents after the measurement.
IRM-1: simple and compact
IRM-1, small, but indispensable for testing PV systems. By measuring solar radiation
values, as well as panel and ambient temperatures, it provides the necessary data to
convert the results into STC conditions. A built-in recorder with a memory of 5000 records
enables the instrument to be used as a tool in the PV plant design process, as well
as to diagnose panel shading problems.
Communication and software
Measurement data from the IRM-1 can be transferred to a computer via the USB port.
In addition, the device has a built-in wireless LoRa interface (Long Range) for automatic
data exchange with the master meter – even over long distances.
Measurement data from the PVM-1021 can be transferred to a computer via Bluetooth
wireless communication. Saving the downloaded data to popular formats and printing
ensured by Sonel Reader. In order to generate a report on electric shock protection use
the optional software: Sonel Reports PLUS.
Tightness and durability
Light meters perform well in harsh environmental conditions. Protection against the
ingress of dust and water is provided by the housing rated at IP54 (PVM-1021) and
IP65 (IRM-1). This is especially important for measurements on photovoltaic systems,
which are outdoor installations.
PVM-1021: trouble? reSYNC!
It may happen that in the course of measurements the master meter moves away from
the IRM-1 so far, that communication between them is lost. If the measurements are
continued, then after the connection is restored, the results will be automatically supplemented
with environmental parameters, which in the meantime were recorded by
the IRM-1 in its temporary memory, and converted into STC conditions.
Specifications
Parameter Measurement
range
Display
range Resolution Accuracy
±(% m.v. + digits)
Voltage
AC voltage 0.0 V…600.0 V 0.0 V…600.0 V 0.1 V ±(2% m.v. + 2 digits)
DC voltage 0.0 V…1000.0 V 0.0 V…1000.0 V 0.1 V ±(0.5% m.v. + 2 digits)
Short circuit current ISC 0.00…20.00 A 0.00…20.00 A 0.01 A ±(1% m.v. + 2 digits)
Insulation resistance
Insulation resistance at AC side
Measuring voltage 250 V 250.0 kΩ…2.000 GΩ
acc. to EN IEC 61557-2 0.0 kΩ…2.000 GΩ from 0.1 kΩ ±(3% m.v. + 8 digits)
Measuring voltage 500 V 250.0 kΩ…5.000 GΩ
acc. to EN IEC 61557-2 0.0 kΩ…5.000 GΩ from 0.1 kΩ from ±(3% m.v. + 8 digits)
Measuring voltage 1000 V 500.0 kΩ…9.999 GΩ
acc. to EN IEC 61557-2 0.0 kΩ…9.999 GΩ from 0.1 kΩ from ±(3% m.v. + 8 digits)
Insulation resistance at DC side
Measuring voltage 250 V / 500 V / 1000 V 250.0 kΩ…300.0 MΩ
acc. to EN IEC 61557-2 0.0 kΩ…300.0 MΩ from 0.1 kΩ ±(8% m.v. + 8 digits)
Resistance of protective conductors and
equipotential bondings
Measurement of resistance of protective
conductors and equipotential bondings with
±200 mA current
0.11 Ω…1999 Ω
acc. to EN IEC 61557-4 0.00 Ω…1999 Ω from 0.01 Ω from ±(2% m.v. + 3 digits)
Measurement of resistance with low current 0.0 Ω…1999 Ω 0.0 Ω…1999 Ω from 0.1 Ω ±(3% m.v. + 3 digits)
Current measurement 0.0 A…400.0 A 0.0 A…400.0 A 0.1 A from ±(5% m.v. + 2 digits)
Power measurement 0.00 kW…100.00 kW 0.00 kW…100.00 kW 0.01 kW ±(6% m.v. + 5 digits)
Safety and work conditions
Measuring category according to EN IEC 61010-2-030 CAT III 1000 V
Ingress protection IP54
Type of insulation according to EN 61010-1 and EN IEC 61557 double
Power supply 4x AA 1.5 V battery
4x Ni-MH AA 1.2 V rechargeable battery
Dimensions 244 x 169 x 71 mm
Weight ca. 1.3 kg
Operating temperature -10…+40°C
Storage temperature -20…+60°C
Humidity 20…80%
Nominal temperature 23 ± 2°C
Reference humidity 40%…60%
Memory and communication
Memory of measurement results 4 059 records
Data transmission Bluetooth
Communication with IRM-1 LoRa
Other information
The product meets the EMC (emission for industrial
environment) requirements according to standards
EN IEC 61326-1
EN IEC 61326-2-2
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