Heated Gas Sampling Hose Selection Against Condensation in Flue Gas and Laboratory Analyzer Lines

JINGCHENG Gas Sampling Hose is an electrically heated sample line for flue gas pretreatment equipment, online monitoring equipment, infrared and ultraviolet sampling analyzers and laboratory test equipment, heat resistant up to 230°C with a bend and kink resistant build. This page maps condensation, sample-loss and kink failures in unheated sample tubing, then shows how to read the three-size JINGCHENG heated gas sampling hose table for flue gas pretreatment, online monitors and laboratory analyzers.

What Goes Wrong in an Unheated Sample Path

A flue-gas or process analyzer can only report the gas that actually reaches its measuring cell. Between the sampling probe and the analyzer the sample often travels several meters of tubing. If that tubing is colder than the gas, four failures follow:

• Condensation — the sample drops below its dew point and moisture collects inside the line.

• Sample loss — soluble components dissolve in the condensate or stick to cold surfaces, so the reading no longer represents the stack.

• Blockage and corrosion — condensate and particulates build up in fittings and narrow passages and shorten the life of the line and downstream parts.

• Kinks and collapsed bore — a sample line routed around a platform, cabinet or laboratory bench can fold, restrict flow and leak.

Keeping the entire sample path at a controlled temperature above the dew point is the standard way to avoid the first three problems. The hose is usually the longest part of that path, so it must heat evenly and survive real routing.

Construction Aimed at Those Failures

JINGCHENG's gas sampling hose is an electrically heated sample line for flue gas pretreatment equipment, online monitoring equipment, infrared and ultraviolet sampling analyzers and laboratory test equipment. Uniformly braided heating elements surround the inner hose so the temperature difference along the inner wall stays small — the point of that construction is to leave no cold section where condensate can form. High-efficiency insulation is selected with the outer surface temperature in mind, keeping heat in the sample and the jacket safer to handle on platforms and in analyzer shelters. The catalog describes the hose as bend and kink resistant, so it keeps a clear bore and stable insulation when it is routed along walkways, through trays and into cabinets, including on portable sampling setups. A sensor (Type J or Type K thermocouple, Ni120, PT100 or PT1000) allows closed-loop control. Heat resistance is up to 230°C (higher on request).

How to Read the Three-Size Catalog Table

Unlike the seven- or eight-row heated-hose tables used for adhesive or high-pressure service, this catalog page lists three small-bore sizes chosen for sample-gas flow: 3/16", 1/4" and 5/16".

• Match bore to sample flow, not to a process-fluid habit of picking 1/2" or larger. The three rows are 3/16" (7.6 mm OD), 1/4" (9 mm OD) and 5/16" (11 mm OD), each ±0.2 mm on OD.

• Working pressure is 203 bar (2936 psi) at 3/16", 173 bar (2501 psi) at 1/4" and 158 bar (2284 psi) at 5/16". Sampling lines are rarely pressure-limited by these figures; still, use the row for your ID if the probe or conditioning unit is pressurized.

• Burst pressure is four times working pressure: 810 / 203 bar, 690 / 173 bar and 630 / 158 bar.

• Minimum bend radius is 30 mm at 3/16" and 1/4", and 40 mm at 5/16". The hose is bend and kink resistant, but the listed radius is still the routing limit next to fittings and cabinet entries.

• Temperature: size the set point from the analysis method and the dew point of the gas, then confirm it against the 230°C standard heat-resistance rating.

Data source: JINGCHENG 2025 Electrically Heated Hose Catalog. Heat resistance up to 230°C; higher temperature on request. Confirm the rating at your operating temperature with our engineers when ordering.

Catalog Uses

Typical duties are heated transfer from a sampling probe to a flue-gas pretreatment or sample-conditioning unit; continuous online monitoring; heated inlets for infrared and ultraviolet sampling analyzers; laboratory bench analyzers and test rigs; and flexible heated lines for portable flue gas sampling.

Selecting a Heated Sample Line

Every JINGCHENG electrically heated hose is built to order. Catalog options include 380 Vac, 220 Vac, 110 Vac, 12 Vdc or other; the sensor types listed above; lengths of 3 m, 4.5 m, 5 m, 6 m, 10 m or other; inner diameters Φ8, Φ12, Φ16, Φ19, Φ25 mm or other; working-pressure options of 4 MPa, 10 MPa, 20 MPa, 35 MPa or other; 110–200 W/m; US, British or metric threads; and the connector pin layout.

A code such as JCH-200-16-B-3X220-P2-8 reads as 200°C, Φ16 mm, inner-tube type (B / TB / T / X), 3X220 supply, PT100 two-wire, 8 MPa.

• Describe the sample gas, its moisture content and the line temperature the method requires (standard up to 230°C).

• Pick 3/16", 1/4" or 5/16" ID for the sample flow and measure the route from probe to analyzer or conditioner.

• State supply voltage, power per meter and the sensor type the controller reads.

• Specify the thread standard at each end and the electrical pin layout.

• Plan the route so the hose is not twisted and bends stay at or above the listed radius, especially next to fittings.

Send gas, temperature, length and connection details for a matching specification and quotation.