FIX800 Sample Conditioning System for High-Temperature and High-Humidity Gas Measurement (Nationwide)

FIX800 Sample Conditioning System — High-Temperature and High-Humidity Gas Measurement (Nationwide)

This article introduces gas measurement technology for environments exceeding 100°C or with humidity above 80% — conditions beyond the standard operating range of most gas detectors.

Why Is Sample Conditioning Necessary?

Gas detectors are electronic instruments rated for approximately −20 to +60°C and 10–90% RH. When measurements are required beyond these limits — gas temperatures exceeding 100°C, humidity above 90%, or sampling from a specific pipe or enclosed point — the FIX800 must be configured in a conditioning enclosure with pump-based suction sampling.

System Configuration

The sample conditioning enclosure is straightforward in concept: a pump draws gas from the measurement point and delivers it to the detector.

Since the FIX800 does not include a built-in pump in this configuration, an external pump is required. High-temperature or high-humidity gas sampling also introduces moisture and particulates, so a dedicated moisture and dust filter is necessary. A power distribution module supplies both the pump and the detector. These three components make up the complete conditioning enclosure.

Moisture Filter — Selection by Temperature

Sampled gas temperature around 100°C: A standard moisture filter is used — a silica gel cartridge removes humidity, and a manual drain valve discharges accumulated condensate.

Sampled gas temperature around 150°C: An advanced moisture filter is required — a Peltier cooling system chills the gas, and an auto-drain pump automatically purges condensate at set intervals.

The completed enclosure connects to the target pipe or sampling point via hose or stainless steel tube at the lower inlet connector — after which the system is ready for measurement.

Depending on site conditions and measurement requirements, two FIX800 units can be mounted in a single enclosure for multi-channel or dual-point measurement.

Frequently Asked Questions

Q1. In what environments is a sample conditioning system required?

Any application involving high-temperature flue or exhaust gas above 100°C (incinerators, boilers, combustion stacks), high-humidity environments above 90% RH (steam lines, cooling towers, wastewater facilities), or remote point sampling from specific pipes where the detector cannot be placed directly at the measurement point.

Q2. What is the difference between diffusion and pump-based sampling?

Diffusion sampling relies on ambient gas naturally contacting the sensor — simple and requiring no pump, but limited to the immediate surroundings. Pump-based suction actively draws gas from a specific point and delivers it to the sensor — essential for high-temperature, high-humidity, or remote measurement points where diffusion cannot reach.

Q3. How often does the moisture filter need to be replaced?

Standard silica gel cartridges saturate over time and require replacement — typically every few weeks to months depending on humidity levels and measurement frequency. Auto-drain advanced units reduce maintenance burden, but drain line integrity should be verified periodically.

Q4. When would two FIX800 units be installed in one enclosure?

When two separate measurement points must be monitored simultaneously, when different gas combinations are needed for each channel independently, or when one unit operates as primary and the other as a calibration backup.

Q5. Which gases can be measured with the high-temperature conditioning system?

All sensor combinations supported by the FIX800 — including EX, CO, O₂, H₂S, CO₂, H₂, and VOC — are available. Sensor suitability for the specific high-temperature process stream and potential cross-interference should be reviewed with a specialist before configuration.

#HighTempGasDetector #HighHumidityGasMeasurement #FIX800 #SampleConditioningSystem #MoistureFilter #FlueGasAnalyzer #PumpSamplingAnalysis #IndustrialGasMonitoring #WANDI #Nationwide