Enmet Formaldemeter htV Manuale Utente Scaricare il pdf (Pagina 6)

ENMET Corporation Formaldemeter htV

3.2 Interferants

3.2.1 Phenol & Resorcinol

The presence of phenol in the air can give a reading on the Formaldemeter

™

htV. When monitoring formaldehyde in

situations where phenolic resins are used, the phenol filters provided should be used. These fit on to the sampling port of the

instrument. The filters will completely remove phenols from the sample even at concentrations in excess of 1000 ppm without

affecting the formaldehyde reading.

3.2.2 Phenol filter life

Each filter should be used no more than five times and then discarded. Partially used filters should not be stored in the vial with

unused filters. Replacement filters can be ordered from through your local distributor.

3.2.3 Alcohols & Aldehydes

As is found with other portable detection equipment, the meter is not totally specific to formaldehyde alone, being susceptible

to a degree of interference from a small range of other chemicals. Other aldehydes and alcohols such as methanol and ethanol

in the atmosphere can cause cross-interference effects.

Table 1: Relative Response of the Formaldemeter

™

htV to Various Compounds in the Vapor Phase

Compound Concentration Required

to Give Reading of 1

PPM

Comments

Acetone No response

Acetaldehyde 8 – 12

Linear response similar to that for

Ethanol

Acetic Acid No response

Ammonia 71000 Response only at very high

concentration

Butanol Very little interference (See note)

Carbon Monoxide 100 Linear response

Ethylene 160

Ethanol 12 – 20 Linear response

Formaldehyde 1.0

Glutaraldehyde 7100 at 25°C

Methanol 50 Linear response

Phenol 5 Can be completely removed with filter

provided

Propanol Very little interference(See note)

Resorcinol 5 Can be completely removed with filter

provided

OTE

: Propanol and Butanol are only likely to interfere at high temperature (greater than 60°C) and high concentration (higher

then 20 ppm).

3.3 Sensor Background Reading

Due to the high sensitivity of the sensor and the widespread occurrence of formaldehyde in the indoor environment, a

background reading of up to 0.05 ppm can often be produced, even when sampling in an atmosphere considered to be free of

formaldehyde or other contaminants.

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Commenti su questo manuale

Nessun commento

Enmet Formaldemeter htV Manuale Utente Pagina 6

Commenti su questo manuale

Prodotti e manuali riguardandi Strumenti di misura Enmet Formaldemeter htV