Corrosion-Resistant Dew Point Transmitter - HG808-G

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HG808-G Corrosion-Resistant Dew Point Transmitter

HG808-G Corrosion-Resistant Dew Point Transmitter Display Option

Corrosion-Resistant Dew Point Transmitter HG808-G HENGKO

Output Option of HG808 Temperature Humidity Transmitter

Probe Type Option of HG808 Temperature Humidity Transmitter

HG808-G Corrosion-Resistant Dew Point Transmitter

Accurate Dew Point Monitoring for Corrosive and Chemically Aggressive Environments

The HG808-G is an industrial-grade transmitter for dew point, temperature, and humidity measurement in harsh chemical and solvent environments.
Made from 316L stainless steel with a nano-coated anti-corrosion finish, it ensures long-term accuracy and stability in the presence of acids, alkalis, and salt mist.

Key Features:
*Corrosion-Resistant Build: 316L stainless steel probe with protective coating
*Wide Measuring Range: Dew point −60 °C ~ +20 °C (−76 °F ~ +68 °F)
*High Accuracy: ±3 °C Td dew point, ±0.2 °C temperature
*Flexible Outputs: RS-485 (Modbus-RTU), 4–20 mA, 0–5 V / 0–10 V
*Industrial Protection: IP65 housing, 16 bar pressure resistance
*Fast Response < 1 s: Ideal for real-time process monitoring
*Easy Integration: Connects directly to PLC, DCS, or SCADA systems

Perfect for:
Chemical | Pharmaceutical | New-Energy | Solvent Recovery Processes

📩 Contact us to configure your corrosion-resistant dew point solution today.

SPECIFICATION

Product Highlights:

Constructed from 316L stainless steel with protective coating for superior corrosion resistance
Measures dew point, temperature, humidity, and PPM simultaneously for comprehensive analysis
Wide measuring range:
Dew point −60 … +20 °C (−76 … +68 °F)
Temperature −20 … +60 °C (−4 … +140 °F)
High accuracy: ±3 °C Td (dew point); ±0.2 °C (temperature @23 °C)
Excellent stability: <1 % RH/year humidity drift; ≤0.1 °C/year temperature drift
Flexible outputs: RS-485 (Modbus-RTU), 4–20 mA, 0–5 V, 0–10 V
Fast response time: <1 s; PLC-adjustable acquisition frequency
Pressure-resistant design: Operates up to 16 bar with IP65-rated enclosure
Non-condensing operation: 0–95 % RH for long-term reliability
Easy integration: Compatible with PLC, DCS, and SCADA systems for continuous process monitoring

HG808-G Data Sheet Details

Here’s a specification details for the HG808-G series Humidity Transmitter :

Category	Specification
Measurement Parameters	Dew Point, Temperature, Humidity, PPM (for reference)
Dew Point Range	–60 °C ~ +20 °C
Dew Point Accuracy	±3 °C Td (±5.4 °F)
Temperature Range	–20 °C ~ +60 °C
Temperature Accuracy	±0.2 °C (@ 23 °C)
Temperature Long-Term Stability	≤ 0.1 °C / year
Humidity Long-Term Stability	≤ 1 % RH / year
Digital Output	RS485 (Modbus-RTU); outputs temperature, humidity, dew point, PPM (humidity & PPM for reference only)
Analog Outputs	Temperature + Dew Point – select one: 4-20 mA / 0-5 V / 0-10 V
Pressure Resistance	≤ 16 bar
Baud Rate	1200, 2400, 4800, 9600, 19200, 115200 bps (selectable; default 9600 bps)
Acquisition Frequency	Fastest response 1 second; adjustable via PLC
Working Environment	–20 °C ~ +60 °C; 0 % ~ 95 % RH (non-condensing)
Power Supply	DC 12 V ~ 24 V, reverse-polarity protected
Power Consumption	< 0.5 W
Output Protocol	Standard Modbus-RTU; compatible with PLC, DCS, and SCADA systems
Construction	Compact aluminum housing with industrial grade ESD & anti-reverse protection
Installation & Customization	Custom probe design available according to application needs (structure, shape, length, material, mounting method)
Protection Rating	IP65 – dustproof and moisture-resistant
Applicable Probe Options	Two probe types available: • Gas Sampling Unit • 316L Stainless Steel Sintered Protective Housing (A-Type, 0A# / 8A#)

HG808 #3 Probe Items List

We offer 6 types of probes for the HG808 Humidity Transmitter, with each type available in both A and B versions, providing a total of 12 probes for various application options.

A-Series Humidity Probe

0A#

8A#

Probe Connector

M20 Hexagonal thread stainless steel probe connector

G1/2 Hexagonal thread stainless steel probe connector

NTP1/2 Hexagonal thread stainless steel probe connector

M27 Hexagonal thread stainless steel probe connector

M20 Flange stainless steel probe connector

About Installation

4-20mA Temperature Humidity Transmitter Wire Connect Diagram

0-10v Temperature Humidity Transmitter Wire Connect Diagram

0-5v Temperature Humidity Transmitter Wire Connect Diagram

Each color wire connect diagram HG808 Humidity Transmitter

Wiring Standard of 4-20mA + RS485 Analog Output Type

Line Color	Definition	Specification
Power Cord
Red	Power supply positive	10 ~ 30V DC
Black	Power supply negative	GND
Analog Output Lines
Brown	Temperature signal positive	4-20mA output
Blue	Temperature signal negative	Connects to Black (GND)
Grey	Humidity signal positive	4-20mA output
White	Humidity signal negative	Connects to Black (GND)
RS485 Wiring
Yellow	RS485A	Twisted pair cable
Green	RS485B	Twisted pair cable

Additional Notes:

Load Capacity:
- Current output: ≤ 600Ω
- Voltage output (not applicable in this table): ≤ 250Ω

Applicable Models: All HG808 Series

Important:

Refer to the device manual for specific connection instructions and any additional requirements.
Ensure proper termination resistors are used on the RS485 bus as per the device manual and relevant communication standards.
Do not attempt electrical wiring without proper knowledge and qualifications.

APPLICATION

Typical Applications – HG808-G Corrosion-Resistant Dew Point Transmitter

1. Lithium Battery Electrolyte Filling / Electrode Coating

Precise dew point and humidity monitoring is critical to prevent moisture contamination of electrolyte solutions and ensure uniform electrode coating quality.

Typical conditions: Dew point ≤ –40 °C, temperature 20 – 30 °C, humidity < 1 % RH.
Control requirement: Continuous online dew point monitoring in glove boxes and drying chambers for ultra-low humidity environments.

2. Chemical Reactors & Solvent Recovery Pipelines

During chemical synthesis or solvent recovery, excessive moisture can affect reaction yield, purity, and safety. The HG808-G provides stable measurements even in acidic, solvent, or oil-vapor atmospheres.

Typical conditions: Dew point –40 ~ 0 °C, temperature 25 – 60 °C, humidity 5 – 40 % RH.
Control requirement: Corrosion-resistant dew point monitoring under HF, HCl, NH₃, or VOC exposure to prevent condensation and corrosion.

3. Pharmaceutical Raw Material Drying

Humidity and temperature stability are essential to maintain API potency and drying uniformity. The HG808-G ensures accurate dew point and temperature control in cleanrooms and drying ovens.

Typical conditions: Dew point –30 ~ +10 °C, temperature 40 – 80 °C, humidity 2 – 20 % RH.
Control requirement: Real-time humidity feedback to optimize drying cycles and ensure GMP-compliant environmental monitoring.

4. Flue Gas Desulfurization (FGD) Towers

FGD processes involve high-temperature, corrosive gases with varying moisture content. The HG808-G’s 316L stainless-steel probe withstands SO₂/SO₃ and acid mist for long-term reliability.

Typical conditions: Temperature 60 – 120 °C, humidity 10 – 80 % RH, dew point 0 ~ 50 °C.
Control requirement: Dew point monitoring for condensation control and corrosion prevention in gas treatment systems.

5. Industrial Exhaust Gas & Emission Treatment

Stable dew point monitoring is required to prevent pipeline condensation, corrosion, and particulate accumulation in emission control systems.

Typical conditions: Temperature 30 – 90 °C, dew point –20 ~ 40 °C, humidity 5 – 70 % RH.
Control requirement: Continuous dew point trend tracking to maintain safe moisture levels before gas filtration or catalytic processing.

Download Product Manual / Certification / Software

1.Tem & Humidity Transmitter E-Catalogue

2. Check All Other Download Files

FAQs

1. What makes the HG808-G suitable for corrosive industrial environments?

The HG808-G is engineered with an integrated corrosion-resistant structure, using 316L stainless steel and a sealed cast-aluminum housing (IP65). It resists acids, alkalis, electrolyte vapors, and chemical solvents, making it ideal for lithium battery, chemical, and pharmaceutical applications where standard sensors fail.

2. How durable is the HG808-G under harsh operating conditions?

This transmitter has undergone strict testing for oil-gas mixtures, chemical corrosion, and dust impact. Its IP65-rated aluminum enclosure and pressure-resistant 316L probe can withstand up to 16 bar, ensuring long-term stability and reliability even in challenging process environments.

3. What output and communication options does the HG808-G support?

The HG808-G offers flexible signal outputs for easy system integration:

Digital: RS485 (Modbus-RTU) for dew point, temperature, humidity, and PPM values.
Analog: Dual-channel outputs of 4-20 mA, 0-5 V, or 0-10 V (user selectable).
This design allows seamless connectivity with PLC, DCS, or SCADA systems for automated dew point and temperature control.

4. Can the HG808-G record and analyze measurement data?

Yes. The transmitter includes data-recording functionality and supports connection to backend analysis software. Users can generate reports and trend charts with one click, enabling efficient monitoring, traceability, and process optimization.

5. What parameters can the HG808-G measure simultaneously?

The HG808-G can output dew point temperature, process temperature, relative humidity, and PPM values at the same time—providing a complete picture of gas dryness and system conditions.

6. How does the HG808-G compare to imported dew point transmitters?

By integrating advanced sensor technology and optimized circuitry, the HG808-G matches the performance of imported brands at a significantly lower cost. It delivers high precision, strong corrosion resistance, and excellent long-term stability, helping customers reduce maintenance and procurement costs.

7. Is customization available for different installation conditions?

Yes. HENGKO offers customized probe designs (structure, length, material, and mounting method) to meet specific process requirements—ensuring accurate and stable dew point measurement under any industrial condition.

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