Public product position; final performance and test conditions require project confirmation.
Line B · Pipeline insertion module
If the decision is made in the pipe, measure the gas in the pipe.
A separate sampling path can add maintenance and another pressure boundary. Line B is designed as a direct flow-through measurement point in the drainage pipe; the final gas path, pressure and installation still need project confirmation.
Current Status: Current status: open for project assessment. The parameters below are engineering targets; final specifications must be confirmed for each project.
SPECVALTECH · ENGINEERING MEASUREMENTFit & Boundary
When does Line B fit your project?
Line B fits when:
- You are monitoring high-concentration CH₄ (0–100 %vol) in a coal-mine gas drainage network.
- You want to avoid adding a bypass sampling line with filters and condensate management.
- You need a direct flow-through measurement point with a G1″ process fitting.
Line B is not the right form when:
- You are monitoring low-level environmental gas in ventilation shafts (This is a high-concentration module).
- Your analyzer already has an internal sampling pump (Look at Line A instead).
- You need a complete device with an existing Ex ia I Ma certificate. Line B currently states a module design target, not a certificate.
Engineering facts
What has to fit around your measurement point.
316L stainless steel; the window sits in the process flow path.
Gas is measured where it moves through the pipeline.
Confirm pipe wall, boss, hole pattern and installation access.
Proportion and interface master; manufacturing tolerances are project-specific.
Ex ia I Ma is a design target, not a certificate. UART standard; RS485 option.
Target specification envelope
Before you use a number, check its condition.
These figures are the current engineering targets derived from the locked product model. They are not completed bench results, customer acceptance data or certification claims.
Condition / boundaryTarget envelope: pressure, temperature, gas composition and flow must be written into the project test conditions.
| Metric | Target value | Condition / boundary |
|---|---|---|
| Target gas / range | TARGETCH₄ · 0–100 %vol | Gob-gas drainage is commonly discussed around 30–80 %vol; the current Line B target range remains 0–100 %vol. |
| Accuracy · low segment | TARGET0–1.00 %vol: ±0.05 %vol | Target value; low and high segments must be reconciled at the 1.00 %vol transition. |
| Accuracy · high segment | TARGET1.00–100 %vol: ±3.5% of reading | At 22 %vol this is ±0.77 %vol; the error band still crosses a 22 %vol decision threshold. |
| Resolution | TARGET0.01 %vol low segment / 0.1 %vol high segment | Segmented to match the measurement and decision use. |
| Response | TARGETT90 ≤ 5 s | Report gas arrival, cell exchange and algorithm window separately; flow-through short path is the design basis. |
| Working pressure | TARGET20–200 kPa absolute | Target envelope; approximately −81 to +99 kPa gauge. Pressure compensation effectiveness is declared separately over the same range. |
| Working temperature | TARGET−10 to +55 °C | Target underground environment envelope. |
| Power | TARGETDC 5 V ±10% | Target input envelope; Ui = 5.5 V. |
| Consumption | TARGET≤0.50 W @25 °C; ≤0.65 W at maximum temperature | High-temperature value is separated because TEC demand increases; 0.65 W remains below the Pi target envelope. |
| Intrinsic-safety inputs | TARGETUi / Ii / Pi / Ci / Li — complete set | Required input for host-instrument intrinsic-safety association; Ex ia I Ma remains a design target, not a certificate. |
| Communication | TARGETUART 3.3 V standard; RS485 optional | The mine-system protocol or CAN mapping is determined by the host instrument. |
| Materials / protection | TARGET316L insertion section · anodized aluminium body · exposed section IP66 | Confirm corrosion, water, dust and cleaning conditions in the project. |
| Calibration interval | TARGETTarget ≥ 6 months | A target service interval; actual calibration and legal inspection frequency follows the project and jurisdiction. |
A project specification should lock the gas, range, pressure, temperature, flow, background gas, warm-up state and evidence status before any value is treated as released.
Check your pipe, fitting and connector against this drawing
Check your pipe, fitting and connector against this drawing
Use the drawing to check the insertion depth, window position, body diameter, G1″ process fitting and sealed connector. Hole pattern and tolerances are confirmed on a manufacturing drawing per project.
SPECVALTECH · ENGINEERING MEASUREMENTFAQ
Questions about the product boundary
Is Line B a complete methane analyzer?
No. It is the measurement module and installation form. The host instrument supplies the system enclosure, control logic, display or interlock and the applicable approval work.
Does 0–100 %vol mean the final accuracy is already certified?
No. 0–100 %vol is the target application range. The final accuracy, pressure compensation and response figures require stated conditions and project or bench evidence.
Why is direct flow-through different from a pipeline mounting clamp?
A clamp can place a diffusion-style sensor near a pipe, but that does not make the gas path a controlled flow-through path. The measurement behaviour, exchange time and pressure response must be assessed separately.
Are 22 % and 30 % universal methane thresholds?
No. These are German drainage-rule reference points used for an engineering discussion. Thresholds and interlock logic must be confirmed for the target jurisdiction and host system.
Engineering Blog
Check the pipe conditions before treating Line B as a fit.
Specvaltech · Engineering measurement
Have a measurement point to evaluate?
Send the conditions you have. Unknown fields are acceptable; we will identify which inputs affect the next decision.