ENMET SDS-97D - Manual (Page 8)

SDS – 97D Sensor / Transmitter ENMET Corporation
6
2.3 Calibration
C AUTION : Sensor/transmitters must be calibrated with the stipulated calibration gas. Although safeguards are provided, it is
possible to miscalibrate a sensor/transmitter by using the incorrect gas.
Calibration is the process of aligning the pre set instrument electronics to the installed sensors, making the instrument read
accurately. It consists of a zero reading which tells the instrument what it should read in uncontaminated (clean) air, and a span
reading that tells the instrument what it should read in the presence of its target gas. Calibration, including the zero and span
adjustments should be performed on a quarterly basis.
Sensor/transmitters are supplied with a pushbutton switch, located on the left side of the front surface. Never push this switch
unless zero or span gas is being applied to the sensor (see caution). This switch facilitates automatic zeroing and automatic
calibration with appropriate gas. The parameters described; stipulated calibration gas, response to calibration gas and the
ENMET part number for a cylinder of calibration gas are given for various sensor types in Table 4.
Table 4: Stipulated Calibration Gases for Digital Sensor/Transmitters
S/T for Gas Calibration Gas Response Cal Gas P/N
Ammonia 50ppm NH3 50 ppm 03318-050
Arsine 0.5 ppm PH3 0.5 ppm 03305-005
Boron Trichloride 10 ppm HCL 10 ppm 03302-010
Carbon Monoxide 100 ppm CO 100 ppm 03219-100
Chlorine 5 ppm CL2 5 ppm 03331-005
Chlorine Dioxide Consult ENMET
Chlorine Trifluoride Consult ENMET
Dichlorosilane 10 ppm HCL 3 ppm 03302-010
Ethylene Oxide 5 ppm ETO 5 ppm 03332-005
Fluorine Consult ENMET
Hydrogen 800 ppm H2 800 ppm 03227-800
Hydrogen Bromide 5 ppm HCL 25 ppm 03302-005
Hydrogen Chloride 10 ppm HCL 10 ppm 03302-010
Hydrogen Cyanide 10 ppm HCN 10 ppm 03303-010
Hydrogen Fluoride 5 ppm CL2 3 ppm 03331-005
Hydrogen Sulfide 20 ppm H2S 20 ppm 03314-020
Nitrogen Dioxide 5 ppm NO2 5 ppm 03333-005
Nitric Oxide 25 ppm NO 25 ppm 03334-025
Oxygen *see note 2 20.9 % O2 20.9 % 03296-209
Ozone 0.3 ppm O3 0.3 ppm Use Ozone generator
Phosgene Consult ENMET
Phosphine 0.5 ppm PH3 0.5 ppm 03205-005
Silane 5 ppm SiH4 5 ppm 03306-005
Silicon Tetrachloride 5 ppm HCL 25 ppm 03302-005
Sulfur Dioxide 10 ppm SO2 10 ppm 03315-010
N OTE 1: All specifications stated in this manual may change without notice.
N OTE 2: * Oxygen S/T with a 0 – 30% range are zero set at the factory. 20.9% by volume O2/78.1% by volume N2 is the
calibration gas. If zeroing of an Oxygen S/T should be needed 100% by volume N2 (0% by volume O2) is the zero
gas.
Toxic S/T 20.9% by volume/78.1% by volume N2 may be used for (clean air) zero gas, see section 2.3.1 automatic
zeroing.