The Vaisala HMK15 is a portable, power-free humidity calibrator for checking and adjusting humidity probes and transmitters with saturated salt references.
The Vaisala HMK15 generates stable relative-humidity reference points using saturated salt solutions. A humidity probe is inserted into the chamber and its reading is compared with the humidity generated by the selected salt at the measured chamber temperature.
The HMK15 is useful for routine field checks, incoming inspection, maintenance work and two- or three-point adjustment of compatible humidity probes and transmitters. Its sealed chambers and transit covers allow the kit to be moved between a laboratory, production area and service location without electrical power.
| Salt solution | Nominal reference | Typical purpose | Total uncertainty at +20 °C with ready-dosed salt |
|---|---|---|---|
| Lithium chloride, LiCl | 11 %RH | Dry-end or offset check | ±1.3 %RH |
| Magnesium chloride, MgCl2 | 33 %RH | Intermediate checkpoint | ±1.2 %RH |
| Sodium chloride, NaCl | 75 %RH | Wet-end or gain check for normal humidity applications | ±1.5 %RH |
| Potassium chloride, KCl | 85 %RH | Additional high-humidity checkpoint | ±2.0 %RH |
| Potassium sulphate, K2SO4 | 97 %RH | Wet-end reference for instruments used continuously at very high humidity | ±2.0 %RH |
Important: the exact reference humidity changes with temperature. Measure the chamber temperature and use the value in the official HMK15 calibration table; do not enter the nominal 11, 33, 75, 85 or 97 %RH value automatically.
For instruments used across a broad humidity range, calibration is normally performed at a minimum of two reference points. Begin with the dry reference before moving to the wet reference.
| Measurement application | Suggested reference points | Reason |
|---|---|---|
| Normal indoor and process humidity | LiCl 11 %RH and NaCl 75 %RH | Checks both dry-end offset and wet-end gain over a practical working range |
| Very high-humidity measurement | LiCl 11 %RH and K2SO4 97 %RH | Provides a wet reference closer to applications operating continuously from 90 to 100 %RH |
| Three-point verification | LiCl 11 %RH, MgCl2 33 %RH and NaCl 75 %RH | Adds an intermediate checkpoint to reveal non-linearity |
| High-range verification | NaCl 75 %RH, KCl 85 %RH and K2SO4 97 %RH | Useful when performance near saturation is especially important |
| Chamber arrangement | Probe fit | Selection guidance |
|---|---|---|
| Basic chamber lid | Vaisala probes and transmitters with a 12 mm diameter | Standard choice for compatible cylindrical humidity probes |
| Universal chamber lid | 12, 13.5 or 18.5 mm probe diameters | Useful when one kit must accommodate several probe-body sizes |
| Dedicated calibration adapter | Model-specific fit, including HMP9 and selected 12 mm probes | Use the correct adapter to seal the chamber and position the sensor properly |
| Custom chamber lid | Available for DMT132 and HMP60/HMP110 configurations | Confirm the required lid and whether the probe filter remains fitted before ordering |
Probe diameter alone does not confirm compatibility. The sensing element must be exposed to the chamber air, the opening must seal correctly and the probe must not extend into the salt solution. Share the complete probe model and filter arrangement when selecting a lid or adapter.
| Method | Best suited to | Consideration |
|---|---|---|
| HMK15 saturated salt calibrator | Portable two- or multi-point checks and compatible instrument adjustment | Requires correct salt preparation, stable temperature, sufficient equilibration and careful handling |
| Comparison with a reference probe | Fast operational checks at the actual process condition | Both probes must experience the same stable air and the reference instrument must have suitable accuracy |
| Accredited laboratory calibration | Formal traceability, stated measurement uncertainty and regulated quality systems | Instrument removal, turnaround time and calibration scope must be planned |
Calibration and adjustment are not the same: calibration records the difference between the instrument and a reference. Adjustment changes the instrument to reduce that difference. Always retain the as-found result before adjustment when measurement history matters.
| Specification | HMK15 |
|---|---|
| Operating temperature | 0 to +50 °C |
| Typical response time | Approximately 10 minutes for Vaisala sensors when probe and calibrator are at the same temperature and final deviation is below ±1 %RH |
| Supplied thermometer accuracy | ±1 °C |
| Dimensions | 90 × 230 × 200 mm |
| Weight | Approximately 1 kg without salt solutions |
| Power requirement | None |
Seacom Process Instruments supplies and supports the Vaisala HMK15 humidity calibrator in Malaysia for industrial maintenance teams, calibration laboratories, pharmaceutical facilities, cleanrooms, environmental chambers, HVAC applications and quality-control departments.
Our team can assist with choosing salt reference points, ready-dosed certified salt packages, chamber lids, probe adapters and a practical check procedure for your instrument fleet. We can also help determine when an HMK15 field check is appropriate and when formal laboratory calibration should be considered.
Contact Seacom with your humidity probe or transmitter model, probe diameter, filter arrangement, required reference points, expected calibration frequency and documentation requirements so we can recommend a suitable HMK15 configuration.
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The Vaisala HMK15 is a portable, power-free humidity calibrator for checking and adjusting humidity probes and transmitters with saturated salt references.
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HMK15 Catalogue
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