Ammonia & Hydrogen Sulfide BTI 2
Ammonia & Hydrogen Sulfide Breakthrough Indicator for carbon absorbers and filters

Filter Replacement Indicator

Item No. 402

Ammonia & Hydrogen Sulfide BTI 2

(4.5” x 2”, 1½”  male NPT)


The Ammonia and hydrogen sulfide breakthrough indicator for activated carbon absorbers and filters is a colorimetric indicator that indicates the saturation and exhaustion of carbon absorbers and filters. The indicator is reliable and cost effect means for protection from exposure to toxic ammonia and hydrogen sulfide in the work place. The indicator change color from light blue to purple or black when carbon absorbers and filters are saturated with ammonia and/or hydrogen sulfide. Hence alerting the user to replace the exhausted carbon absorber or filter. The indicator is easily connected to the inch female NPT outlet of the carbon absorber or filter using the 1½ inch male NPT threading at the bottom of the indicator. It is highly sensitive to ammonia and hydrogen sulfide. It operates at temperatures -20oC to 65oC (-4oF to 149oF) and humidities 5% RH to 95%RH. The indicator is 4.5 inch tall, 2 inch diameter and you can observe the bright vibrant color change from all directions. The unique design of the indicator prevents any color change due to exposure to contaminants in the surrounding environment and changes color only when carbon absorber or filter is saturated. The indicator has extended service life of 2 years and 2 years shelf life.

Product Manual

Product Specifications
a Weight: 129.5g (4.6oz)
b Dimensions: 11.43cm (4.5in), diameter 5.08cm (2.0in)
c Inlet dimensions: 1.5" MNPT
d Operating temperature: -20oC to 65oC (-4oF to 149oF)
e Operating humidity: 5% RH to 95%RH
f Minimum detectable limit: 10ppm•hr NH3, 1ppm•min H2S at 30 cm/sec face velocity
g Color change: Light blue to purple or black
h Storage temperature: 4oC to 25oC, (39oF to 77oF)
i Shelf life: 2 years at 4oC to 25oC, (39oF to 77oF)
j Service life: 2 years

THE AMMONIA & HYDROGEN SULFIDE BTI 2 CAN BE REUSED BY REPLACING THE EXHAUSTED AMMONIA & HYDROGEN SULFIDE INDICATOR AND TOP CHARCOAL WITH FRESH AMMONIA & HYDROGEN SULFIDE INDICATOR ASSEMBLY AND CHARCOAL.

Ammonia & Hydrogen Sulfide BTI 2 Refill Kit Item No.402-5000 Includes:
1- One Ammonia & Hydrogen Sulfide Indicator Assembly (Item No. 402-1600)
2- Activated Charcoal (Item No. 402-5200)
3- Two Porous Plugs (Item No. 402-1400)
4- Three Cotter Pins (Item No. 436-1300)

Miniature-Hook Pick (Item No. 431-9100) Option
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Ammonia & Hydrogen Sulfide BTI 2
Ammonia & Hydrogen Sulfide Breakthrough Indicator for carbon absorbers and filters
Filter Replacement Indicator
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