Formaldehyde

NO.91PL

HCHO

Specifications

Calibration Range	(0.01)-0.20 ppm
Measuring range	0.01-0.80 ppm
Sampling (flow) Rate	200mL/min
Sampling Volume	6000mL, 2000mL
Sampling Time	30min, 10min.
Detecting Limit	0.005 ppm
Colour Change	Light yellow → peach (pale pinkish) colour
Corrections for temperature/humidity	Temperature
Shelf life	1 year (in the refrigerator)
Accuracy	CV=5-10% (CV: Coefficient of variation = σ: standard deviation / mean value x 100)

Possibly coexisting substances and their interferences (NOTE)

Substance(s)

Interference

Colour change by itself

Ammonia	max. 2 ppm	No	No
Nitrogen dioxide	max. 1 ppm	No	No
Acetaldehyde		"+" error (higher reading)	produces pinkish discolouration
Acetone	max. 0.3 ppm	No	Produces pinkish stain around tube opening (inlet)
Ethanol		No	No
Ethyl acetate		No	No
p-dichlorobenzene		No	No
Toluene		No	No
Scrubber 1 (black):removes acetone Scrubber 2 (purple): Ammonia and nitrogen dioxide are removed. The presence of ammonia causes the purple scrubber 2 to turn yellow. The presence of nitrogen dioxide causes scrubber 2 to turn a darker shade of purple

Calibration gas generation

Diffusion tube method (analysis: by absorptiometry, acetylacetone method)

Miscellaneous

Electric sampling pump
This detector tube is suited for measuring formaldehyde in indoor environments. The GSP-200 / GSP-300FT series automatic gas samplers (or comparable sampling devices/pumps) should always be used for optimal performance.
A deviation of +/-10% in the sampling flowrate (i.e. amount of air flowing through the tube at a given moment) or the sampling amount (total sampled amount of target substance) causes an average margin of error of approx. +/-10% (maximum +/-20%) in the indicated value.
Formaldehyde indoor concentration threshold: 0.08 ppm (mean value during 30 minutes)

TLV-TWA	TLV-STEL	Explosive range
-- --	C0.3ppm	7.0×73%