Chilled mirror dew point hygrometer with excellent measurement accuracy, designated as a humidity standard in JIS Z 8806
DewStar S-1
Dew Point Range: -40 ℃DP to 50 ℃DP
DewStar S-1 is a reliable, long-selling chilled mirror dew point hygrometer (also known as a mirror-type or optical dew point hygrometer) that has supported humidity measurement across various industries for many years. Despite being a portable model, it offers excellent long-term stability, high measurement performance, and reliability. Additionally, with the optional platinum mirror, it is capable of measuring corrosive gases, making it a versatile and trusted choice in diverse applications.
Brochure (English)
Features
- Equipped with a uniquely designed AccuStar (automatic mirror cleaning mechanism).
- Optional durable platinum mirror enables measurement of corrosive gases.
- Calculation functions allow on-site confirmation of various measurement values.
- Portable and transportable dew point hygrometer.
Key Applications
- Humidity Calibration Standard (Humidity Reference Standard)
- Dew Point Measurement in Furnaces and Constant Temperature/Humidity Chambers
- Humidity Control in Cleanrooms and Dry Rooms
- Humidity Management in Laboratories, etc.
Order Code
| Code | Mirror | Sensor Unit Coating *2 | Heater *3 |
| S-1S-0 | Rhodium | x | x |
| S-1S-4 | Platinum | x | x |
| S-1S-6 | Platinum | o | x |
| S-1S-8 | Rhodium | x | o |
| S-1S-C | Platinum | x | o |
| S-1S-E | Platinum | o | o |
*1 Separate monitor (S-1M-0) for the chilled mirror dew point hygrometer is required.
*2 Platinum mirror and sensor unit coating enable measurement of corrosive gases. For details on compatible gases, please contact us.
*3 For measuring dew points higher than ambient temperature. This option must be specified at the time of factory shipment and cannot be retrofitted later.
| Product Name | Chilled mirror optical dew point hygrometer |
| Model | DewStar S-1 |
| Dew Point / Frost Point Range | -40 ~ 50 ℃DP * Heater option must be selected for measuring dew point temperatures higher than ambient temperature. |
| System Accuracy | ± 0.1 ℃DP (at 23 ℃DP) |
| Repeatability | ± 0.05 ℃DP（at 25 ℃） |
| Operating Conditions | Sensor Unit: 0 ~ 60 ℃ Monitor Unit: 0 ~ 35 ℃ ≤ 95%rh (non-condensing) |
| Sampling Flow Rate | 0.5 ~ 2.5 L/min |
| Measured Values | Dew Point / Frost Point (℃) Temperature (℃) Pressure (kPa) |
| Calculated Values | Relative Humidity (%rh) Absolute Humidity (g/m³) Moisture Content (PPMv, PPMw) |
| Outputs | Digital: RS-232C Analog: 4 ~ 20 mA, 0 ~ 5 VDC PhotoMOS Relay |
| Sample Gas IN-OUT | 1/4″ Compression Fitting |
| Power Supply | AC 90 ~ 240 V（50 / 60 Hz） |
| Power Consumption | 50 W |
| Dimensions | Sensor Unit : W 133 x H 180 x D 355 [mm] Monitor Unit : W 203 x H 105 x D 33 [mm] |
| Weight | Sensor Unit : Approx. 5.0 kg Monitor Unit : Approx 0.5 kg |
| Included Items | Sensor Unit ⇔ Monitor Unit Connection Cable (Standard 3 m) |
Options
- Temperature Sensor S-1S-001
- Air Pump Unit S-PU
- Heater Control Unit S-HC
Technical Documents
- Brochure (English)