POWERSIDE PQube 3 User manual

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Alameda, CA 94501, USA
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PQube® 3 Power Analyzers
Installation Manual
PQube 3, 3e, 3v, 3r, 3v, 3LV
Revision 3.4

PQube 3 Installation Manual
Manual#: 851-000135
Version 3.4 –08/11/2022 Page 2 of 47
If this equipment is used in a manner not specified by the manufacturer, the protection provided by
the equipment may be impaired. Installation, service, and maintenance of your PQube 3 must only
be done by qualified personnel for electrical installations.
The information contained in this document is subject to change without notice.
POWERSIDE MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR USE.
POWERSIDE shallnot beliableforerrorscontainedhereinorforincidentalorconsequentialdamages
in connection with the furnishing, performance, or use of this material. If you do not accept this
limitation on liability, please return the product to POWERSIDE prior to use.
Produced in the United States of America.
Symbol
Meaning
Caution. Consult this manual in all cases where this
symbol is marked, in order to findout the natureof
the potential hazards and any actions which have
to be taken to avoid them.
Caution. Risk of electric shock
Alternating current
Alternating current (AC) or direct current (DC)
Double or Reinforced insulation
Functional earth terminal not relied on for safety
© 2008–2022 Powerside All rights reserved. No parts of this document may be copied, reproduced, or translated to another language without the prior written consent of Powerside “PQube
3” is a registered trademark of Power Standards Lab. “Windows” “Excel,” and “PowerPoint” are registered trademarks of Microsoft Corporation. All product names, trademarks and registered
trademarks are property of their respective owners
.
WARNING: Death, serious injury, or fire hazard could result from improper connection or
operation of this instrument. Carefully read and understand manual before connecting this
instrument.
AVERTISSEMENT: Si l'instrument est mal connecté, la mort, des blessures graves, ou un
danger d'incendie peuvent s'en suivre. Lisez attentivement le manuel avant de connecter
l'instrument.
WARNUNG: Der falsche Anschluß dieses Gerätes kann Tod, schwere Verletzungen oder Feuer
verursachen. Bevor Sie dieses Instrument anschließen, müssen Sie die Anleitung lesen und
verstanden haben.
ADVERTENCIA: Una conexión incorrecta de este instrumento puede producir la muerte,
lesiones graves y riesgo de incendio. Lea y entienda el manual antes de conectar.

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1Introduction 5
1.1 What is a PQube® 3?......................................................................................................... 5
What software do you need? 6
Which power configurations are supported? 6
Powering the PQube 3? 7
Easy operation and communication with PQube 3? 7
1.2 PQube 3 Unique Features? ............................................................................................... 7
1.3 Overview of PQube 3 models and modules...................................................................... 8
1.3.1 PQube 3 8
1.3.2 PQube 3e 8
1.3.3 PQube 3v 9
1.3.4 PQube 3r 9
1.3.5 PQube 3LV 10
1.3.6 Modules and Accessories 11
1.4 Overview of PQube 3 Ports, Connections and Controls.................................................. 12
1.5 Choosing Modules .......................................................................................................... 14
1.5.1 Power PQube 3 from 100 to 240 Vac (PM1/PM2) 14
1.5.2 Backup PQube 3 during a power outage (UPS1/UPS2/UPS3) 14
1.5.3 Measure currents from secondary of current transformers (CTI-1A/CTI-5A) 15
1.5.4 VAT2-600 Three Phase AC/Dual DC Voltage Attenuator 15
1.5.5 Relay Extension Module for load shedding (RM8) 16
1.5.6 Measure Environmental Conditions (ENV2) 16
1.5.7 Synchronize your PQube 3 clock to GPS time 17
2Installing the PQube 3 18
2.1 Unpacking the PQube 3 .................................................................................................. 18
2.2Installation...................................................................................................................... 18
2.2.1 Disconnect mains prior to servicing 18
2.2.2 Mount your PQube 3 properly and securely 18
2.2.3 Include overcurrent protection and a disconnecting device 19
2.2.4 Protect the Operator from the Hazardous Terminals 19
2.2.5 Connect PQube 3 to the power supply 22
2.2.6 Connecting the wires 24
2.2.7 Connect Mains AC Voltage Wires 26
2.2.8 Protect antenna terminals from lightning 26

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2.2.9 Installing a PM1 or PM2 Power Supply Module 27
2.2.10 Installing UPS Module 27
2.2.11 Installing Split Core Current Transformers (CTs) 28
2.2.12 Connecting the ENV2 Environmental Probes 32
2.2.13 Connecting the Output relay (RLY1) 32
2.2.14 For PQube 3r and PQube 3vr: Connecting the Output relays RLY2, RLY3, RLY4 33
2.2.15 Installing GPS-R Sync Module (GPS Synchronization) 33
3Wiring Diagrams 34
3.1 Wiring diagram for PQube 3v and PQube 3vr................................................................. 34
3.2 Wiring Diagrams (PQube 3, PQube 3e, PQube 3r) .......................................................... 35
3.2.1 Single Phase L1-N 35
3.2.2 Single Phase L1-L2 35
3.2.3 Single phase 3-wire / Split Phase 36
3.2.4 Delta—3 CTs 36
3.2.5 Delta—2 CTs 37
3.2.6 Wye/Star 37
3.2.7 Measuring Neutral Current 38
3.2.8 Measuring Earth Current 38
3.2.9 Measuring Net Earth Current—Delta 39
3.2.10 Measuring Net Earth Current—Wye/Star 39
4Configuring the PQube 3 40
4.1 Using the Configurator.................................................................................................... 40
4.2Initial Device Setup ......................................................................................................... 41
4.2.1 Set Potential Transformer (PT) Ratio 41
4.2.2 Set Current Transformer (CT) Ratio 42
4.2.3 Troubleshooting: Common Installation Errors 44
5Maintenance 46
5.1.1 Turning Off PQube 3 46
5.1.2 Replacing PQube 3’s Clock Battery 46
5.1.3 Life Expectancy of the PQube 3 and the PM1/PM2 module 46
5.1.4 UPS1 Life Expectancy and Long-Term Storage Instructions 46
5.1.5 Cleaning Instructions 47
5.1.6 Reasons for reset 47
5.1.7 Calibration Information for Your PQube 3 47

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1Introduction
1.1 What is a PQube® 3?
PQube® 3 is an instrument for both monitoring and diagnosing issues with electric power systems
and sensing environmental conditions, helpingyou to quickly solve problems that impact the quality
and reliability of your product or process.
Think of it as a black box for your electric power, environment, and process: It is a unique
combination of the best features of a power disturbance monitor, a power/energy meter, a process
and environmental data logger, and a digital fault recorder. It’s easy to install, easy to use. No special
training is required, no software required.
What does the PQube 3 record?
In a few words, your PQube 3 detects and records disturbances on the mains circuit: Sags/dips,
swells, interruptions, frequency variations, HF impulses, Rapid voltage changes, waveform changes
and more…It also records steady state power quality parameters like flicker, unbalance, THD
harmonics and Interharmonics. PQube 3 is compliant with the most stringent Power Quality
measurement standards: Class A IEC 61000-4-30 Ed3 (2015).
The PQube 3 is one of the few analyzers that measure 2kHz-150kHz conducted emissions.
Your PQube 3 automatically generates daily, weekly, and monthly trends/statistics reports.
When connected to compatible current transformers, your PQube 3 records current waveforms,
RMS magnitude, current unbalance and powers (watts, watt-hours, VARs, power factor, and other
power-related parameters). The PQube 3 can monitor power and energy on several circuits.
The PQube 3 when equipped with POWERSIDE ultra-precise CTs, is fully compliant with IEC 61000-
4-30, edition 3 Class A certified requirements and can be used as a revenue grade Class 0.2 energy
meter.
Your PQube 3 includes 4 general-purpose channels for interfacing with voltage output types of
sensors(RPM, torque, flow, vibration…). It has a digital input,which can be usedas an external trigger
source, and a relay contact output, used to notify alarms to an external indicator or PLC (the relay
opens for at least 3 seconds for any detected event).
Your PQube 3, with up to 2 optional ENV2 environmental probes, can measure and trigger on
temperature, humidity, barometric pressure and mechanical shocks, seismic disturbances and
vibration.

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What software do you need?
You don’t need special software to use your PQube 3. It
records all data on internal memory or via a removable
microSD card.
Your PQube 3 generates graphs for each disturbance
detected, graphs for trends on daily, weekly, or monthly
basis. Your PQube 3 also automatically generates
summary reports.
No special software is required—just open the GIF picture
files with standard image programs,MicrosoftWord® and
Microsoft PowerPoint®, or open the CSV files with any
spreadsheet program such as Microsoft Excel®.
You configure your PQube 3 with our free PQube 3
Configurator program.
Which power configurations are supported?
Your PQube 3 can monitor circuits anywhere in the world from single phase, split phase to various
types of 3-phase configurations: wye, delta, open delta, corner grounded delta.
It can auto-detect nominal voltages from 57.5 Vac up to 600 Vac phase-to-phase, 960 Vac phase-to-
phase. It can auto-detect mains frequencies of 16.7 Hz, 50 Hz, 60 Hz, and 400 Hz. For medium and
high-voltage applications, your PQube 3 supports PT ratios (up to 50000:1) and CT ratios.
Beyond AC voltage, your PQube 3 can be used to monitor DC voltage at up to 60 Vdc, or up to 1200
Vdc with an optional interface module (ATT1). For both DC voltage and DC current use the ATT2
interface module. For example, which can be useful for applications such as monitoring photovoltaic
generation sites or battery banks of UPS.
Your PQube 3 with an additional module (VAT2) can monitor both the input and output of a 3-phase
UPS.

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Powering the PQube 3?
It can be directly powered from 24 Vac or 24 to 48 Vdc source.
If a network hub with Power over Ethernet (PoE) is available, the PQube 3 can be powered from its
Ethernet Port.
If a wall power socket is available, you can power the PQube 3 with a plug-in PM1/PM2 module
(range AC 100 Vac to 240 Vac, 50/60 Hz, or 120 Vdc to 370 Vdc).
Easy operation and communication with PQube 3?
No network is required to retrieve files from your PQube 3. Simply copy the data using a USB thumb
drive or microSD card.
If a network connection is available, PQube 3 can automatically send you emails whenever it detects
an event. You can use emails the PQube 3 to send a new setup file and update its firmware. It
includes a built-in web server,FTPserver, and supports communicationprotocolsincludingMODBUS
TCP/IP, SNMP and DNP3.
1.2 PQube 3 Unique Features?
There are many power quality meters, energy meters, and energy recorders available. What makes
the PQube 3 unique?
Nosoftware. Open data—No specific software is required. Allthe data that the PQube3 records are
in standard easy to understand open formats. No need to buy or lease software from POWERSIDE
or pay a fee to see or use your data.
Friendly data—Data is organized and presented to you in a format you can understand.
Works out of the box, or you can customize your configuration—Auto configuration, enables you
to instantly measure and start recording data. You can change almost any setting using the PQube 3
Configurator program.
Works with or without a network—Plug the cable into your PQube 3’s Ethernet Port and get emails
when an event occurs, use your Internet browser to navigate through recorded events and trends.
Real-time measurements are also available via communication protocols such as Modbus/TCP,
SNMP (including traps), or DNP3.
Don’t have a network? You can extract the data onto a USB thumb drive (or microSD) and look at all
the files on any computer without proprietary software.
Store years of data in its internal flash memory—Your PQube 3 has a microSD card option which
can serve as a backup for the internal memory.
Ultra-compact size—The PQube 3 is compact, it’s easy to integrate into your equipment, enclosure,
or electrical panel.
Great value—The PQube 3 provides high-end features at an affordable price.

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1.3 Overview of PQube 3 models and modules
PQube 3 Power Analyzer family
1.3.1 PQube 3
PQube 3 is the most popular model in the family. It is
easy to set up and comes from the factory with a default
set up so you can “plug and go” for most installations. It
auto-detects the mains frequency, wiring configuration
and nominal voltage. You can connect directly to up to
600 volts (nominal) and the device computes 4-
quadrantANSIClass0.2revenue—gradeenergyoneight
single-phase channels and is certified for Class A power
quality according to IEC 61000-4-30 Ed3.
The PQube 3 holds years of data and thousands of
events via 32 GB of internal flash memory.
1.3.2 PQube 3e
PQube 3e is the natural extension of PQube 3 with 6
additional current channels, giving you the ability to
connect up to 14 energy metering channels.
The channels can be assigned in any combination of 4
three-phase loads or 14 single-phase loads. You can
quantify energy costs by monitoring multiple loads
withasinglerevenue-grade PQube3e poweranalyzer.

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1.3.3 PQube 3v
If you are focusing purely on voltage compliance, the
PQube 3v is the best value: It connects the mains voltage
directly at up to 600 Vac nominal.
The unit does a great job verifying electricity delivered at
the Point of Common Coupling (PCC), as well as
diagnosing equipment malfunctions. It monitors AC
power (or DC voltage), but you can also monitor process
parameters like speed or flow, by attaching sensors to the
analog AC/DC channels.
You get the same ultra-precise results delivered
immediately to your inbox.
Setup is identical to the PQube 3: You only need to
configure voltage values and the unit uses the same easy-
to-use Configurator tool.
1.3.4 PQube 3r
PQube 3r is the best choice for protecting sensitive
processes that need accurate detection of power
disturbances and flexible relay programming. The PQube
3r Power Analyzer has 4 built-in programmable relay
outputs that can be individually assigned to a specific
trigger condition associated to the type or severity of
disturbance. The output relays can trigger on sag, swells,
interruptions, wave shape changes, over/under
frequency, high frequency impulses, and over/inrush
current.

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1.3.5 PQube 3LV
PQube 3LV is equipped with low voltage inputs ranging
from 0 to 28 Vac nominal and up to 40 Vac maximum. These
low voltage inputs are ideal for interfacing with medium
voltage sensors in the distribution grid. This model has
many equivalent features of the PQube 3 such as being a
class 0.2 revenue grade meter and certified for Class A
power quality according to IEC 61000-4-30 Ed3. Install the
PQube 3LV in an outdoor enclosure for applications that
require power analyzed in the distribution grid, data
centers, or harsh outdoor environments.

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1.3.6 Modules and Accessories
Each PQube 3 comes standard with the following features:
•Three AC mains voltage channels
•Eight current channels (for CTs with 0.333 V secondary), fourteen channels for PQube 3e
•Four analog input channels for additional signals (for example, the output of a power
supply)
•One digital input channel (monitor the state of an interlock switch)
•One signal output relay (notify your PLC that an event has occurred)
•Power supply input rated for 24 Vac or 24 to 48 Vdc
•One 10/100 Ethernet Port (PoE compatible)
•One high-speed USB 2.0 port (for USB Drive or ENV2 environmental probe)
•Two standard USB 1.0 ports (for ENV2 environmental probes)
•Full-color touchscreen
•32 GB internal memory
•One USB Drive included with each PQube 3 (contains manual, quick-start guide, setup file,
Configurator program, and Report Writer program)
Several types of modules and accessories are available, including:
•AC/DC Interface: VAT2, ATT1, and ATT2
•Power Supply and Backup: UPS1, UPS2, and UPS3
•Time and Synchronization: GPS-R
•Relay Extensions: RM8
•Environment Sensors: ENV2
•Current Interface for 1A/5A CT Secondaries: CTI-1A and CTI-5A
Frequently asked questions on choosing modules for specific applications:
•Will the PQube 3 be powered from 100 to 240 Vac (50/60/400 Hz) and if so, is battery
backup required in the event of a power outage? See Power Supply and Backup Modules
•Do I need current inputs to measure the 1 A or 5 A secondary of a CT at ANSI Class 0.2 or IEC
62053-22 Class 0.2S revenue energy accuracy? See CTI Series CT Interface Modules
•Do I need ultra-precise GPS time stamps on my data? See Time and Sync Modules
•Do I want to record the environmental conditions such as temperature, humidity, pressure,
or acceleration? See Environmental Sensor

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Below is an overview of the PQube 3 family and accessories. The left-hand connected modules
include the GPS-R, RM8 relay, and CTI 1A/5A modules. The right-hand connected modules
include the PM1/PM2 power supplies and UPS 1/2/3 power backup modules. Other accessories
include the ATT1/ATT2 attenuators, split core CTs, and ENV2 environmental probes.
1.4 Overview of PQube 3 Ports, Connections and Controls
GPS-R

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A
Coin-cell battery (keeps real time clock
alive when instrument power is lost)
I
10/100 Ethernet RJ-45 Port. 48V PoE compatible.
B
USB-1 High-Speed USB 2.0 Port for USB
hard drives and adjacent microSD card
slot (format using FAT32 file system)
J
USB-2 Standard USB 1.0 Port for use ONLY with ENV2
environmental probes.
C
Touchscreen display
K
USB-3 Standard USB 1.0 Port for use ONLY with ENV2
environmental probes.
D
Signal relay output. Normally closed
during recording mode. Opens ½ cycle
after the event or device shutdown.
L
Current transformer inputs—nominal 0.333V RMS
(LOW range) or ±10Vpk (HIGH range)
E
Analog inputs. Maximum ±60 Vdc or 33
Vac to earth. Can be used as differential
inputs.
M
L1, L2, L3 voltage inputs. See page 29 for
maximum voltage ratings.
F
Earth—functional. Use as a reference
point for analog inputs (not needed if
using analog channels in differential
mode).
N
Neutral terminal—optional depending on
your power configuration
G
Digital input. Wetted with 2.4 V at 3
microamps. 1.5 V threshold. 60 V
maximum.
O
Not connected, for isolation from ground.
H
Power supply input. 24 Vac or 24 Vdc to
48 Vdc (either polarity) nominal. 20 VA
max
P
Earth—functional. Used as the reference
point for voltage measurements.
IMPORTANT: This terminal must be properly
connected to ground for safety, accuracy, and
reliability.

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1.5 Choosing Modules
1.5.1 Power PQube 3 from 100 to 240 Vac (PM1/PM2)
If you have 24 to48 Vdc or 24 Vac, you can use your PQube 3’s internal
power supply (just connect the voltage to the power supply screw terminal
blocks).
If you need to power your PQube 3 from 100 to 240 Vac, you’ll need the
plug-in PM1 or PM2 Power Manager module.
The PM2 module also includes a 24 Vdc auxiliary output so you can power small
accessories (up to 5 W) like LEDs or fans.
1.5.2 Backup PQube 3 during a power outage (UPS1/UPS2/UPS3)
UPS1
Connect the UPS1 Battery Backup module to your PQube 3 to provide
up to 30 minutes of backup power during a power outage. It can be
used with or without a PM1 or PM2 module.
UPS2 and UPS3
Extended autonomy models are
available: The UPS2 backup module
provides extended power backup (up to
one hour) with a POWERSIDE XB1 lead
acid battery pack. The UPS3 is identical
to UPS2 but also includes power source
to back up 5 watts of accessories. Both
units offer a wide temperature range
(25 °C to 60 °C)forsevereenvironments
such as shipboard.

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1.5.3 Measure currents from secondary of current transformers (CTI-
1A/CTI-5A)
Your PQube 3 comes standard with 8 current
channels which are compatible with CTs with
0.333V secondary.
But if you need to measure CTs with 1A or 5A
secondary wires for your application, use the CTI
Current Transformer Input module.
There are two versions: one with 1A input and
one with 5A input. Use the CTI module that
matches the secondary rating of your external
CTs.
There are four current inputs per module. Your
PQube 3 can accommodate up to two CTI
modules.
Use this module if your application requires
ANSI C12.20 Class 0.2 or IEC 62052-22 Class 0.2S
revenue grade accuracy.
1.5.4 VAT2-600 Three Phase AC/Dual DC Voltage Attenuator
The perfect solution for monitoring two sets of three-phase AC voltages
such as the primary and secondary side of transformers or the input and
output of a three—phase UPS.

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1.5.5 Relay Extension Module for load shedding (RM8)
You can now turn your PQube 3 into a powerful controller,
command the shedding of loads to protect your main distribution
circuit from tripping.
The RM8 extension relay module easily plugs in to your PQube3
(also PQube 3e) and its 8 relays are fully programmable.
This allows you to customize your load shedding scheme by
assigning incremental thresholds, or by applying the scheme to
protect up to 4 circuits. And the PQube 3 power Analyzer measures,
reports in real-time and records the power, VA, VARs and Power
Factor of all the circuits monitored.
1.5.6 Measure Environmental Conditions (ENV2)
The ENV2 environmental probe allows your PQube 3 to measure ambient temperature, humidity,
pressure.
It also includes an accelerometer to measure shock and vibration, a thermocouple input for wide
temperature ranges, and a solar irradiation input.
Connect up to 2 probes to your PQube 3 using a MicroUSB to USB cable.
You can use a USB cable with a length of up to 15 ft /5 m.

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1.5.7 Synchronize your PQube 3 clock to GPS time
Your PQube 3 can synchronize its time clock to GPS, which provides a 1
microsecond internal clock accuracy. This is useful for Class A
measurements, or if you need time synchronization for diagnostic and
troubleshooting purposes.
GPS-R Sync Module
The GPS-R module interfaces with OEM TNC type GPS antennas to provide
your PQube 3 with ultra-precise time (no drift) timestamping for power
quality events.
The GPS-R receiver locks onto GPS satellites to provide your PQube 3 with
ultra-precise GPS timing.
Connect the GPS-R module using an RG58C/U cable with 50 ohm
impedance with maximum attenuation of 20 dB. The maximum cable
length is 50 ft cable length.

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2Installing the PQube 3
2.1 Unpacking the PQube 3
Verify that your package contents are complete:
➢1 PQube 3
➢1 USB thumb drive (contains the manual, quick-start guide, setup file, Configurator program,
and Report Writer program)
➢1 six-pole voltage connector (mains voltage)
➢8 two-pole connectors (current inputs)
➢1 two-pole connector (power supply)
➢1 ten-pole connector (for analog channels, digital input, relay output)
Note:
•PQube 3e comes with an additional 6 two-pole connectors (additional current inputs)
•PQube 3v, PQube 3vr do not have current terminals nor connectors
•PQube 3r and PQube 3vr come with a set of 3 three-pole connectors (for the additional 3 relays)
2.2 Installation
2.2.1 Disconnect mains prior to servicing
IMPORTANT: Your PQube 3 must be installed only by qualified personnel for electrical installations.
Always disconnect all mains connections, and verify disconnections, prior to servicing.
In the United States and Canada, the equipment installation shall meet ANSI/NFPA 70, NEC, with
CSA C22.1, CEC, Part I or with both as appropriate. In other countries, follow all local installation
requirements and regulations.
2.2.2 Mount your PQube 3 properly and securely
Your PQube 3, and its optional modules, are designed to be mounted on an industry standard 35
mm DIN rail as rack- or panel-mounted equipment.

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GPS module on left
side of PQube 3
PQube 3 (main module)
PM1/PM2 Module
on right side of
PQube 3
UPS1 Module
on far right
side
Example installation:
2.2.3 Include overcurrent protection and a disconnecting device
An external overcurrent protection device, such as a fuse or a circuit breaker, must be installed on
each mains connection. The recommended fuse rating is 2 A, 600 Vac, 200 kA IR AC, Time Delay, and
Class CC. The device shall be UL Listed, branch circuit type overcurrent protector. You should
consult a qualified electrician to determine the overcurrent protection installation.
Your PQube 3 can share the overcurrent protection device with other loads.
An operator-activated disconnecting device, such as a switch or a circuit breaker, must be installed
on the mains connections. The recommended disconnecting device rating is 600 Vac/dc, Max 30 A,
SCCR: 200 kA This device must be clearly marked as the disconnecting device for your PQube 3 and
must be marked to indicate the disconnection function. Do not install your PQube 3 in such a way
that it becomes difficult to operate this disconnecting device. The disconnecting device must not
disconnect the earth connection. The disconnecting device should be installed near your PQube 3,
within easy reach of the operator.
2.2.4 Protect the Operator from the Hazardous Terminals
IMPORTANT:All high-voltage parts must be covered, including the AC power to your PQube 3. Install
your PQube 3 so that all of the screw terminal blocks are not accessible
1
to the operator. Your PQube
3 can also be installed without a cover if installed in a lockable UL 508 control panel.
1
Accessible, as defined in UL 61010-1,means able to be touched with a standard test finger ortest pin, when used as specified
in UL61010-1 6.2.

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The operator must be protected from the hazardous screw terminal blocks by a barrier. The screw
terminal blocks must be made “not accessible,” as defined in UL /IEC 61010-1 6.2, using an enclosure
or barrier that meets the rigidity requirements of UL /IEC 61010-1 8.1 and that requires a tool to
remove.
If you choose to install your PQube 3 in an enclosure, select a UL-listed enclosure that is appropriate
for the purpose. If you plan to use an enclosure of this type, you should review its mechanical
compatibility with any optional features of your PQube 3 that you plan to use: optional USB
connections, optional temperature-humidity probes, etc.