HXB-V1 Specifications and reference

What the HXB-V1 is for, how it looks and what flows inside, its specifications and electrical ratings, and the terms used in this handbook. Read it once before installation and come back when you need a value.

On this pageIntended use

Intended use
Product views
Flow inside the unit
Specifications
Electrical ratings and environment
Labels on the unit
Terms
Manufacturer

Intended use#

The HXB-V1 is a 2 kW AEM water electrolysis system that makes hydrogen from DI water with a 0.1 M KOH electrolyte. One 6U 19-inch rack holds the stack (HXS-2), electrolyte tank, pumps, heat exchanger, power and controls.

Laboratory research on AEM stacks, electrodes and operating strategies
Small-scale hydrogen production and system-integration test beds

Installation, operation and maintenance are for people who know hydrogen safety and venting, high-current DC and alkaline electrolyte handling. If you modify the unit or run it outside the recommended conditions, verifying safety and performance is your responsibility and the warranty may change (see Warranty and service).

Product views#

HXB-V1 in perspective: a black 6U rack case with a handle on each side of the front — Figure 11-1 The HXB-V1. Appearance may vary by revision.

HXB-V1 front: tubing ports, status LED, power switch and inlet — Figure 11-2 Front. For port numbers and names, see figure 4-1 in Quick start.

HXB-V1 rear, with ventilation openings and the label — Figure 11-3 Rear. The Device ID on the label identifies the unit.

Flow inside the unit#

Electrolyte leaves the tank through the circulation pump and heat exchanger into the stack; oxygen and electrolyte return to the tank, where they separate. Hydrogen leaves the stack on its own line to H2 OUT. The make-up pump replaces the water used, through H2O IN.

Control app P&ID screen showing the tank, circulation pump, heat exchanger, stack, gas outlets and measuring points — Figure 11-5 The P&ID screen in the control app. Live readings appear at each point.

Specifications#

The specifications below are the same values as the product page and datasheet. They are beginning-of-life values unless stated otherwise.

Production performance

H₂ production: 500 L/h (approx. 1 kg/day)
Energy use (kW): 2.4 kW (BOL · 2.0 stack + 0.4 BoP)
Energy use (kWh/Nm³): 4.8 (BOL)
Energy use (kWh/kg-H₂): Stack 44 · system 54 (the difference, about 10 kWh/kg, is the BoP)
Operating current: 15–67 A (50 A recommended)

Hydrogen purity & pressure

H₂ purity @ 0 barg: 98–99% (no dryer) · ≥ 99.999% (with dryer)
H₂ purity @ 10 barg: 99% (no dryer) · ≥ 99.999% (with dryer)
H₂ pressure: 0 or 10 barg · chosen at order (relief valve); 35 barg by agreement

Power & water

Power supply: 200–240 V AC · 50/60 Hz · single phase
Water conductivity: Recommended ASTM D1193 Type II (≤1.0 µS/cm) · in-service ≤30 µS/cm
Water consumption: 0.55 L/h (50 A · 60 °C)
Feed water top-up: Built-in gear pump refills automatically
Electrolyte: KOH 0.1–1 M · circulation 2–5 L/min

Installation

Ambient temp: 5–45 °C
IP rating: IP 20
Dimensions: 482 × 647 × 266 mm (6U)
Weight: 51.3 kg
Fluid connections: H₂O · H₂ · O₂ · VENT · DRAIN 1/4″ double-ferrule
Power inlet: C20 AC inlet (C19 cable)
Installation clearance: Front ≥ 300 mm · rear ≥ 400 mm

Controls & communications

Control: Desktop app (MQTT/Ethernet)
Direct control: Voltage · current · electrolyte temperature · electrolyte flow
Stack handling: Removable · disassemblable · replaceable
Telemetry: 1 s interval · 8 external control variables · Modbus TCP supported (not RTU)

Safety & warranty

Safety: H₂ detection · emergency stop (control app) · interlocks · electrolyte tank pressure switch auto-stop
Warranty: 12 months from shipment, or from acceptance where an acceptance procedure applies (consumables excluded)

Electrical ratings and environment#

Rated supply: 200–240 V AC · 50/60 Hz · single phase · 2.4 kW
Power connection: IEC 60320 C20 inlet (16 A) · C19 power cord
Protection class: Class I. Plug into an earthed outlet.
Enclosure rating: IP20
Location: Indoor use only, non-condensing
Ambient temperature: 5–45 °C
Altitude: Up to 2,000 m
Overvoltage category · pollution degree: Overvoltage category II · pollution degree 2
CE conformity: Self-declared to the Low Voltage (2014/35/EU), EMC (2014/30/EU) and RoHS (2011/65/EU) directives, applying EN 61010-1, EN 61326-1 and EN IEC 63000. Download the declaration under “Sources for this chapter” below.

Labels on the unit#

General warningBeside H2 OUT and H2 VENT, where hydrogen comes out. Follow the hydrogen section of the safety chapter.
Do not obstruct the outletBeside H2 OUT and H2 VENT. Never block the outlets or stack things in front of them.
Electric shock hazardBeside the power switch and C20 inlet. Always disconnect from the mains before opening any cover.

Terms#

Term	Meaning
AEM	Anion exchange membrane: a membrane that passes hydroxide ions (OH⁻).
KOH	Potassium hydroxide, used as a 0.1 M solution for the electrolyte.
DI water	Deionised water. Quality is judged by conductivity (µS/cm at 25 °C).
MEA	Membrane electrode assembly: the electrodes and membrane that make up the heart of a cell.
BoP	Balance of plant: everything around the stack, such as power, pumps, tank, heat exchanger, piping, sensors and controls.
barg	Gauge pressure in bar, relative to atmosphere.
NL/h	Gas volume per hour in litres at standard conditions (0 °C, 1 atm).
BOL	Beginning of life. Specifications are BOL values unless stated otherwise.
SDS	Safety data sheet. Check it before handling KOH.
P&ID	Piping and instrumentation diagram. The P&ID screen in the control app shows the flow and measuring points inside the unit.
PSU	The power supply that feeds DC to the stack.

Manufacturer#

Manufacturer: HydroXpand Inc.
Address: 3F, 59 Dongtansandan 6-gil, Hwaseong-si, Gyeonggi-do 18487, Republic of Korea
Contact: +82 70-4110-1201 · [email protected] · hydroxpand.com

Serial numbers take the form HXB-V1-YYMM-#### (year and month of manufacture, then a sequence number). Quote the serial number or Device ID from the label when you contact us.