The portable humidity calibrator. Generate any RH, on the bench or on site.
A new setpoint in about 30 seconds. No liquid water.
Calibrate 7 probes of any brand against a traceable reference.
The HG-101 is a portable relative-humidity generator: it produces a known, stable humidity so you can calibrate humidity sensors, probes, transmitters, data-loggers and recorders from any manufacturer — in the lab or on site, against an ISO 17025 traceable reference.
Every humidity sensor drifts. A logger that reads 45 %rh when the air is really 50 %rh quietly biases a batch record, a clean-room release, a storage decision. Calibration is the only way to know what a reading is worth.
And it has to be done against a known, stable reference humidity — held long enough to read every probe. That is exactly what the HG-101 produces, on demand, from 2 to 98 %rh.
Ask the HG-101 for a value and it gets there fast. The patented RDSa rotary-dilution system blends dry and moist air in a closed loop — so a step from 20 to 80 %rh settles inside ±0.1 %rh in about thirty seconds, with no pump and no waiting hours for a salt solution to equilibrate.
The HG-101 circulates its own air over a regenerable silica-gel desiccant and dilutes it to the humidity you asked for — there is no liquid-water reservoir to fill, spill or contaminate.
The desiccant is economical and simply reactivated in an oven at 130 °C. Nothing to empty, dry or clean between runs — so you can lay it flat, tilt it, carry it, and run a full day of calibrations.
The standard HG-101-CH7 cell holds 7 probes (adapters for 10–24 mm, up to 30 mm diameter). Interchangeable ports and a replaceable measuring chamber accept sensors, probes, transmitters, data-loggers and recorders from any manufacturer — even loggers with integrated sensors.
A mixed fleet is calibrated in one run, against the same reference humidity. Other cell configurations are available on request.
Not every hygrometer is a probe you can slide into a port. Data-loggers and recorders carry the sensor inside the instrument — so the SET132 adds a large CH132 measuring chamber that takes the whole device into the controlled humidity.
The logger is calibrated exactly as it is used, without dismantling anything. Need both worlds? The SET-COMBO pairs the CH132 chamber with the 7-port probe cell.
The HG-101 controls to your setpoint with a built-in RH probe supplied with a COFRAC or SCS traceable ISO 17025 calibration certificate. For the lowest uncertainty, pair it with an MBW 473-RP2 chilled-mirror reference — its head drops straight into a 30 mm port.
USB and the free Windows / Android software drive setpoint sequences (up to 10 points, dwell times, ramps); MBW Gecko applies certificate corrections automatically.
From the panel switches and the free Windows / Android app to the interchangeable adapters and test chamber — the HG-101 in use.
set values, dwell times and ramps from a PC or smartphone over USB.
high-contrast LED display, or full control over the USB interface.
fit most probe diameters with a simple tool — any manufacturer.
tailored cells for loggers with integrated sensors and special shapes.
pair it with an MBW 473-RP2 chilled-mirror hygrometer for the lowest uncertainty.
4.9 kg in a rugged case — 48 h battery, nothing to drain before transport.
| humidity generation range | 2…98 %rh |
| response time | 30 s for a 20→80 %rh setpoint |
| control stability | ≤ 0.1 %rh (best over 10…90 %rh) |
| temperature homogeneity | ≤ 0.10 °C (at +21 °C) |
| operating temperature | +5…+50 °C (HG-101 placed in a climatic chamber) |
| operating principle | RDSa rotary dilution, closed loop — patented, silent (no pump) |
| reference probe | built-in RH control probe · COFRAC/SCS traceable ISO 17025 certificate |
| reference hygrometer (option) | MBW 473-RP2 chilled mirror + Gecko software |
| test cell | HG-101-CH7 · 7 ports · adapters ⌀ 10…24 mm (up to 30 mm) · interchangeable |
| set point control | panel switches or USB (PC / tablet / smartphone) · sequences up to 10 points |
| software | Windows & Android apps included |
| desiccant | regenerable silica gel (reactivate in an oven at 130 °C) |
| display | high-contrast LED, 14 mm digit height |
| power supply | 5 VDC via USB · 100–240 V AC adapter included · < 0.3 W |
| battery | rechargeable cell · up to 48 h autonomy |
| dimensions | 300 × 155 × 100 mm (transport case 450 × 300 × 200 mm) |
| weight | 4.9 kg |
supplied with a rugged transport case, interchangeable adapters and an ISO 17025 (COFRAC/SCS) traceable calibration certificate as standard.
every set generates 2…98 %rh with the silent RDSa loop and up to 48 h of battery. Custom cells and adapters on request; for the lowest uncertainty, pair any set with an MBW 473-RP2 chilled-mirror reference.
Any relative-humidity instrument: sensors, probes, transmitters, data-loggers and recorders, from any manufacturer. Interchangeable ports and a replaceable measuring chamber fit most instrument types, including loggers with integrated sensors.
About 30 seconds to reach and hold a new setpoint (a step from 20 to 80 %rh), thanks to the patented RDSa rotary-dilution system — versus hours for saturated-salt methods. Over the full 2 to 98 %rh range, extended stabilisation gives the best performance.
No liquid-water reservoir. It runs on a closed circulation loop with a regenerable silica-gel desiccant, so it works in any position, needs no draining, drying or cleaning between uses, and is ready as soon as it is powered up.
Seven, in the standard HG-101-CH7 test cell (adapters for 10 to 24 mm, probes up to 30 mm). Interchangeable ports and other cell configurations are available on request for different instrument types.
Yes. The built-in control humidity probe is supplied with a COFRAC or SCS traceable ISO 17025 calibration certificate, and it pairs with an MBW 473-RP2 chilled-mirror reference for the lowest uncertainty. MBW Gecko software applies the certificate corrections automatically.
Yes. It weighs 4.9 kg, is powered and controlled over USB with up to 48 hours of battery autonomy, runs silently (no pump) and can be used in any position — so you calibrate where the instruments are installed.
Tell us about your instruments — we'll come back with a quote, a datasheet, or a demonstration with your own probes.
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