NAGCO Hydrogen Sulfide (H2S) Detector Tubes 2-40% | N10-103-50

The NAGCO N10-103-50 Hydrogen Sulfide (H2S) Detector Tubes provide direct-reading measurement of very high concentrations of hydrogen sulfide expressed as percent by volume. The standard measurement range is 2–40% H2S using a half pump stroke with a 50 mL sample volume and a sample time of approximately 1.5 minutes.

For applications requiring lower measurement ranges, the N10-103-50 can also measure 0.5–10% H2S using two pump strokes or 1–20% H2S using one pump stroke with the appropriate correction factor.

Key Features

• Designed for very high concentration hydrogen sulfide (H2S) measurement
• Readings expressed in percent (%) H2S
• Standard measurement range: 2–40%
• Extended measurement ranges: 0.5–10% and 1–20%
• Direct-reading colorimetric detector tube
• Standard measurement uses 0.5 pump stroke / 50 mL sample volume
• Approximately 1.5-minute sample time at standard range
• No humidity effect from 5–85% RH under specified conditions
• Light blue to black color change
• Precision: ≤ ±10% Relative Standard Deviation
• 3-year storage life under specified storage conditions
• No electrical power required

Specifications

• Manufacturer: NAGCO
• Part Number: N10-103-50
• Target Gas: Hydrogen Sulfide (H2S)
• Standard Range: 2–40%
• Extended Ranges: 0.5–10% / 1–20%
• Standard Pump Strokes: 0.5
• Standard Sample Volume: 50 mL
• Standard Sample Time: 1.5 minutes
• Standard Correction Factor: 1.0
• Precision: ≤ ±10% Relative Standard Deviation
• Linearity: r² = 0.999
• Humidity: No effect from 5–85% RH
• Temperature Range: 0–40°C (32–104°F); correction factors apply
• Color Change: Light Blue → Black
• Storage Life: 3 years in darkness at 5–25°C (40–77°F); refrigeration preferred

Measurement Ranges

• 0.5–10%: 2 pump strokes / 200 mL / 2 × 1.5 minute sample time / correction factor 0.25
• 1–20%: 1 pump stroke / 100 mL / 1.5 minute sample time / correction factor 0.5
• 2–40%: 0.5 pump stroke / 50 mL / 1.5 minute sample time / correction factor 1.0

Temperature Correction

• 0°C (32°F): Correction factor 0.75
• 10°C (50°F): Correction factor 1.0
• 18°C (64°F): Correction factor 1.0
• 40°C (104°F): Correction factor 1.0

Cross-Sensitivity & Interferences

NAGCO documents cross-sensitivity testing with carbon monoxide, carbon dioxide, nitric oxide, ammonia, methane, sulfur dioxide, isobutylene, hexane, benzene and toluene. At the specified test concentrations, most of the listed compounds produced no apparent reading. However, 10% ammonia produced an apparent reading of 3.5% with a blue indication. NAGCO also identifies mercaptans as possible interferences and reports no response to sulfides under the documented test conditions. Refer to the NAGCO datasheet for complete cross-sensitivity information and test conditions.

Pump Information

NAGCO recommends using NAGCO detector tubes with NAGCO sampling pumps. CPS Calibrations can assist customers transitioning from another detector tube system with selecting the appropriate NAGCO tube and sampling equipment for their application.

Important: This detector tube measures hydrogen sulfide in percent (%) rather than ppm. NAGCO notes that measurement timing should be controlled to exactly 2 minutes for best accuracy. Detector tube readings may also be affected by temperature, interfering compounds and application conditions. Always follow the NAGCO datasheet and pump operating instructions for the specific measurement being performed.

View NAGCO N10-103-50 Hydrogen Sulfide Detector Tube Datasheet (PDF)