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HMK15 catalogue
Humidity Calibrator HMK15
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Vaisala HMK15 Humidity Calibrator with Salt Chambers
The Vaisala HMK15 is a portable, power-free humidity calibrator for checking and adjusting humidity probes and transmitters with saturated salt references.
- Suitable for laboratory work and on-site humidity checks
- Supports 11, 33, 75, 85 and 97 %RH nominal reference points
- Typically stabilises in 10 to 30 minutes when temperatures are equal
- Certified, ready-dosed salt packages are available
- Basic and universal chamber lids suit several probe diameters
- No electrical power or external humidity generator required
Vaisala HMK15 for Field Checking and Calibrating Humidity Instruments
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.
Choose the Correct HMK15 Salt Reference
| 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.
Recommended Two-Point Calibration
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 |
HMK15 Chamber Lids and Probe Compatibility
| 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.
HMK15, Reference Probe or Laboratory Calibration?
| 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.
HMK15 Main Specifications
| 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 |
Vaisala HMK15 Supplier and Humidity Calibration Support in Malaysia
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.
16 other products in the same category:
The Vaisala GMW90 Series provides stable wall-mounted carbon-dioxide and temperature measurement, with optional humidity, for demanding HVAC and building-automation applications.
- Carbon-dioxide measurement from 0 to 5000 ppm
- CO₂ accuracy up to ±(30 ppm + 2% of reading)
- Temperature measurement from −5 to +55 °C
- Optional HUMICAP® relative-humidity measurement from 0 to 95 %RH
- Voltage, current or Modbus RTU output models
- Display and CO₂ status-indicator options
- Field-exchangeable calibrated measurement modules
- Traceable three-point CO₂ calibration certificate included
The Vaisala HMP1 is a high-accuracy, interchangeable humidity and temperature probe for indoor spaces. It connects directly to an Indigo200 or Indigo300 transmitter to create a compact wall-mounted measurement system.
- Humidity accuracy up to ±1.0% RH
- Temperature accuracy up to ±0.2 °C
- 0–100% RH and −40 to +60 °C measurement ranges
- Modbus RTU and full Vaisala Indigo compatibility
The Vaisala HMT360 Series was an intrinsically safe transmitter platform for humidity, temperature and moisture measurement in hazardous areas. It is discontinued and replaced by the Vaisala HMT370EX with an application-specific probe.
- HMT361 wall mounting → HMP371
- HMT363 ducts and confined spaces → HMP373
- HMT364 high pressure and vacuum → HMP374
- HMT365 high temperature → HMP375
- HMT367 high humidity → HMP377
- HMT368 pressurised pipelines → HMP378
The Sekonic ST-50A displays temperature and relative humidity and records both on a continuous paper chart.
- Electronic temperature and humidity sensing with LCD display.
- Optional extension cables for remote sensor placement.
- Battery operation or a suitable external DC supply.
- Desktop or wall-mounted installation.
Being phased out: confirm availability before ordering. Alternatives include the Sato Sigma II for paper records, Sato SK-L754 for electronic logging and Vaisala viewLinc for centralised monitoring.
The Vaisala HMT140 Wi-Fi Data Logger has been discontinued and is no longer recommended for new monitoring systems.
- Primary replacement: Vaisala RFL100 with AP10 VaiNet Access Point
- Existing HMT140 installations can continue to be supported
- Migration should be checked against the existing sensor and input type
- Contact Seacom for replacement selection and viewLinc compatibility
The Vaisala HMDW80 Series provides cost-effective humidity and temperature measurement for routine HVAC and building-automation applications.
- Humidity accuracy up to ±3% RH
- Wall, duct and outdoor installation models
- Current or voltage output configurations
- Replaceable INTERCAP® humidity sensor
The Sato Mini-Cube 7008-10 records temperature and relative humidity on a seven-day paper chart for routine inspection and filing.
- Temperature range: −15 to 40°C.
- Humidity range: 5 to 100%RH, non-condensing.
- Quartz-controlled seven-day chart rotation.
- Replaceable cartridge pens.
- Powered by one AA zinc-carbon battery.
- Supplied with 55 sheets of seven-day chart paper.
The Vaisala XMW85 Series provides reliable indoor CO2, humidity and temperature measurement for demand-controlled ventilation, smart buildings and indoor air-quality monitoring.
All models support Modbus RTU over RS-485, with two-in-one and three-in-one measurement configurations and optional metric or non-metric displays.
The Vaisala HMP3 is a high-accuracy, field-maintainable probe for industrial HVAC, air-handling units, cleanrooms, paint booths and environmental chambers.
- Humidity accuracy up to ±0.8% RH
- Temperature measurement from −40 to +120 °C
- Field-replaceable filter and HUMICAP sensor option
- Standalone Modbus RTU or Vaisala Indigo transmitter operation
The Vaisala HMM100 provides reliable humidity measurement and a configurable analog output for integration into environmental chambers and OEM equipment.
- 0–100% RH measurement range
- Relative-humidity or dew-point output
- Current and voltage output options
- Plastic or stainless-steel probes for temperatures up to +180 °C
The Vaisala HMT120 and HMT130 provide accurate, stable humidity and temperature measurement for cleanrooms, laboratories, data centres and demanding HVAC applications.
Product transition: HMT120/HMT130 are expected to be phased out. For new projects, the Vaisala Origo10 is the recommended replacement platform.
- Humidity accuracy up to ±1.5% RH
- HMT120 loop-powered 4–20 mA output
- HMT130 voltage outputs, RS-485 and relay
- Interchangeable fixed or remote measurement probe
- Origo10 recommended for new installations
The Vaisala Indigo200 Series is the standard transmitter platform for one interchangeable Indigo-compatible smart probe, providing local display and practical automation-system connectivity.
- Indigo201 with three analog outputs and two relays
- Indigo202 with Modbus RTU and two relays
- Colour display with numerical and graphical views
- IP65 enclosure for industrial measurement applications
The Vaisala PTU300 combined barometric pressure, relative humidity and temperature in one transmitter. The series is discontinued and has been replaced by a suitable Indigo520 barometric-pressure configuration with an application-specific HMP probe.
- Legacy three-in-one pressure, humidity and temperature transmitter
- PTU301, PTU303, PTU304, PTU305, PTU307 and PTU308 variants
- Former applications include laboratories, meteorology and semiconductor measurement
- Current replacement platform: Indigo520 with barometric-pressure measurement
- Humidity probe selected according to mounting and process conditions
- Existing wiring, outputs and process connections require migration review
The Isuzu TH27R paper temperature and humidity recorder has been discontinued and is no longer recommended for new installations. Seacom continues to support existing instruments with selected chart papers and recording pens.
- Legacy temperature range from −20 to +50 °C
- Relative-humidity range from 0 to 100 %RH
- Quartz-driven cylindrical paper-chart recorder
- Replacement TH27R chart papers and cartridge pens remain available
- Existing recorder and chart details must be confirmed before ordering
- Closest current substitute: Sato Sigma II NSII-Q thermohygrograph
The Vaisala Indigo300 is a rugged industrial transmitter for one Vaisala Indigo-compatible smart probe, providing local measurement display and up to three configurable analog outputs.
Its corrosion-resistant IP66 metal enclosure, flexible probe mounting and interchangeable probe design make Indigo300 suitable for humidity, temperature, dew point, CO2, moisture in oil and other demanding industrial measurements.
The Vaisala HMD60 Series provides high-accuracy humidity and temperature measurement for demanding HVAC ducts and light-industrial applications.
- Humidity accuracy up to ±1.5% RH
- Temperature accuracy up to ±0.1 °C
- Analog, Modbus RTU and BACnet MS/TP options
- Robust IP66 metal enclosure