Twin Tube Holder GV500

GASTEC Twin Tube Holder GV500

GASTEC Twin Tube Holder GV500 Dual Channel Protector

Rigid. Shockproof. Protect Twin-Tube Sampling Pairs.

The GASTEC Twin Tube Holder GV500 is an engineered protective accessory designed for GASTEC twin-tube chemical detection systems. Certain chemical compounds (such as Vinyl Chloride, Nitric Acid, or specific Chlorinated Hydrocarbons) require a two-tube combination where the air first passes through a pre-treatment or drying tube before entering the primary indicator tube. The GV500 encases both fragile glass tubes in a shock-resistant cradle, preventing inter-tube buckling, air leaks, or accidental breakage during sampling.

DualTube Pretreatment & Reagent Pair Support
ShockproofElastomer Protective Outer Armor
SeriesAirtight Zero-Leak Inter-Tube Coupling
Zero SparkATEX Zone 0 Intrinsically Safe

Rigid Dual-Tube Cradle

Securely locks both the pre-treatment and indicator tubes in perfect linear alignment.

Airtight Silicone Inter-Tube Coupler

Precision-molded flexible connector creates a leak-proof bridge between the two tube ends.

Shock-Absorbing Rubber Armor

Thick outer elastomer bumper cushions the glass tubes against dropped tools and heavy field knocks.

Unobstructed Scale Inspection Windows

Dual elongated viewing slots allow complete visibility of reagent color stain lines at all times.

Direct GV-100S Pump Coupling

Locks directly into the inlet of GASTEC manual sampling pumps (GV-100S / GV-110S) with zero play.

Intrinsically Safe & Spark-Free

Manufactured with non-conductive, anti-static polymers safe in hazardous petrochemical environments.

Twin-Tube Alignment. Secure Pre-Treatment for Critical Gas Detection.

01

Break Tube Tips

Break all 4 glass tips of the pre-treatment tube and reagent tube pair using the pump tip breaker.

02

Connect with Rubber Sleeve

Join the two tubes in series using the airtight silicone connecting sleeve, observing directional airflow arrows.

03

Encase in GV500 & Sample

Snap the connected tube pair into the GV500 cradle, attach to GV-100S pump, and perform normal sampling strokes.

GASTEC GV500 Twin Tube Holder
04

Linear Axis Stabilization

Prevents the flexible rubber joint from bending under vacuum tension, ensuring constant flow geometry.

05

Reagent Layer Shielding

Provides 360-degree impact defense around delicate chemical conversion layers.

06

Quick Release Thumb Latch

Allows rapid single-handed ejection of spent tube pairs when moving to the next sampling location.

Vinyl Chloride & Polymer Production

Enables reliable two-stage sampling (Tube 131 series) to eliminate interfering chlorinated solvents.

Nitric Acid & Nitrogen Dioxide Pairs

Uses pre-scrubber tubes to remove moisture and sulfur dioxide before measuring acid mists.

Fumigant Analysis in Complex Cargo

Houses pre-filter tubes that scrub out moisture and heavy organic vapors during container testing.

Combustion Flue Gas Interference Removal

Allows pre-cleansing of soot, particulates, and high humidity in industrial boiler exhaust tests.

Petrochemical Aromatic Profiling

Separates Benzene from complex background aliphatic hydrocarbons using selective pre-treatment beds.

Wastewater Treatment Plant Gas Audits

Protects dual-tube setups when analyzing trace sulfides in heavily saturated bio-gas streams.

The Specs Speak for Themselves

Mechanical features that guarantee reliable multi-tube measurements.

Did you know?

Zero Joint Bend

prevents flexible rubber connector kinking during pump stroke pulling suction

Did you know?

100% Impact Proof

elastomer outer armor protects delicate glass tubes against sudden drops onto concrete floors

Did you know?

Dual Window

elongated scale windows allow simultaneous observation of both pre-treatment and indicator tubes

GASTEC Twin Tube Holder GV500 Technical Specifications

Compatibility, construction materials, and physical dimensions.

Specification ParameterDetails
Product ModelGASTEC Twin Tube Holder GV500 (Part No. GV500)
Compatible TubesAll GASTEC Twin Tube series (two tubes connected in series)
Construction MaterialHigh-impact chemical-resistant thermoplastic elastomer
Inter-Tube ConnectorPrecision medical-grade silicone airtight connecting sleeve
Compatible PumpsGASTEC GV-100S, GV-100LS, GV-110S
DimensionsApprox. 260 (L) × 28 (W) × 25 (H) mm
WeightApprox. 65 g
Operating Temperature-10°C to +50°C

Frequently Asked Questions

A twin tube consists of two separate glass tubes—a pre-treatment tube (which absorbs humidity or interfering gases) and an indicator tube (which produces the color stain). They are connected in series with a rubber sleeve before sampling.
While you can physically connect them with a rubber sleeve, the long assembly easily bends or snaps when you pull the pump handle. The GV500 keeps both tubes rigidly aligned and protected from breakage.
Each tube has a printed directional arrow and is clearly marked as 'Pre-treatment tube' or 'Primary tube'. The pre-treatment tube always faces the air intake, and the primary tube connects to the pump.
Yes, the GV500 holder is completely reusable for years. Only the glass detector tubes and inter-tube sleeves are consumable items.
Yes. The holder is made of spark-resistant non-metallic materials, making it intrinsically safe for ATEX Zone 0 applications.