ALPHA DIS030 Dew Point Indicator
| Brand | ALPHA |
|---|---|
| Origin | United Kingdom |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | DIS030 |
| Pricing | Upon Request |
Overview
The ALPHA DIS030 Dew Point Indicator is a compact, loop-powered, single-channel display unit engineered for real-time dew point monitoring in industrial gas and compressed air systems. It operates in conjunction with the compatible PDT series dew point transmitters—utilizing chilled-mirror or aluminum oxide sensing principles (depending on configuration)—to deliver precise, trace-level moisture measurement across a wide operational range. Designed specifically for integration into power generation infrastructure, HVAC control loops, and critical drying processes, the DIS030 adheres to fundamental metrological requirements for humidity instrumentation under ISO 8573-1 (compressed air quality), IEC 61511 (functional safety for SIS), and IEEE C37.122.2 (moisture monitoring in SF₆-insulated equipment). Its architecture supports continuous operation in ambient temperatures from –20 °C to +70 °C and withstands process pressures up to 50 bar(g), making it suitable for direct mounting on switchgear enclosures, turbine inlet ducts, and desiccant dryer outlets without signal degradation or thermal drift.
Key Features
- 4-digit red LED display with 270° rotatable housing and 360° adjustable front panel for optimal line-of-sight readability in confined or angled installations
- Two-wire 4–20 mA loop-powered design (12–33 VDC supply) enabling seamless integration into existing PLC/DCS analog input channels
- IP65/NEMA 4-rated enclosure for resistance to dust ingress and water jets—validated per EN 60529 and UL 50E
- Integrated M12 5-pin connector with standard 2 m shielded cable for robust field wiring and EMC compliance (IEC 61326-1)
- Factory-configurable output units: dew point temperature (°C/°F), ppmv (11–9999, equivalent to –60 °C to +7 °C), or %RH (0–100%, optional calibration)
- Long-term stability of ±0.5 °C dew point over 12 months under typical operating conditions, verified per ISO/IEC 17025-accredited calibration protocols
Sample Compatibility & Compliance
The DIS030–PDT system is validated for use with non-corrosive, particle-free process gases including compressed air, nitrogen, SF₆, argon, and natural gas (up to 50 bar(g)). It complies with EN 61000-6-2 (immunity) and EN 61000-6-4 (emissions), and meets the mechanical durability requirements of IEC 60068-2 for vibration and shock. For power industry applications, the system satisfies the environmental monitoring provisions of IEC 62271-1 (high-voltage switchgear) and supports GLP-compliant data logging when paired with ALPHA’s optional Modbus RTU interface module. All factory calibrations are traceable to NPL (UK) and include uncertainty statements per ISO/IEC 17025.
Software & Data Management
While the DIS030 operates as a standalone indicator without embedded firmware or network connectivity, it serves as the primary local readout within larger ALPHA monitoring ecosystems. When integrated with the PDT transmitter’s 4–20 mA output, it enables direct connection to SCADA historians, Allen-Bradley ControlLogix analog input modules, or Siemens S7-1200 AI cards. Optional ALPHA Configuration Utility (Windows-based, USB-to-M12 adapter required) permits field re-ranging, unit selection, damping adjustment (0.1–10 s), and zero/span verification—each action logged with timestamp and operator ID to support audit trails under FDA 21 CFR Part 11 (when deployed in regulated pharmaceutical or biotech utilities).
Applications
- Power Industry: Continuous humidity surveillance inside GIS compartments, circuit breaker enclosures, and transformer breathers to prevent condensation-induced flashover
- Industrial Drying: Real-time feedback control for desiccant wheel dryers, refrigerated dryers, and fluidized bed granulators where residual moisture affects powder flowability and stability
- Gas Processing: Turbine inlet air monitoring to avoid ice formation; environmental chamber validation for aerospace component testing
- HVAC & Cold Chain: Precision dew point control in cleanrooms (ISO 14644), pharmaceutical cold storage, and semiconductor fab ambient conditioning
- Custom Sampling Systems: Base configurations (pressure regulator + flowmeter + sampling cell) and explosion-proof IP67 variants for Zone 1/21 hazardous areas (ATEX/IECEx certified upon request)
FAQ
Can the DIS030 be used with third-party dew point transmitters?
Yes, provided the transmitter outputs a linear 4–20 mA signal corresponding to a dew point range within –60 °C to +50 °C and complies with HART physical layer specifications.
Is NIST-traceable calibration documentation included?
Each unit ships with a UKAS-accredited calibration certificate (ref. NPL-ALPHA-2024-DP-XXXX), including as-found/as-left data, uncertainty budget, and environmental test conditions.
What is the maximum allowable pressure drop across the PDT sampling port?
For accurate measurement, differential pressure across the sensor head must remain below 5 kPa; ALPHA recommends installing a pressure-reducing regulator upstream if inlet pressure exceeds 10 bar(g).
Does the DIS030 support alarm relay outputs?
No—the DIS030 is a display-only device. Alarm functionality requires integration with external PLC logic or ALPHA’s optional PDT-ALM module (dry contact, 250 VAC/2 A).
Can the display orientation be locked after adjustment?
Yes—mechanical set screws on both the housing mount and front bezel allow permanent fixation at any rotational position to prevent accidental misalignment during maintenance cycles.
