ENMET MX-2100 - Manual (Page 12)

MX2100 ENMET Corporation
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3.6 Measurements
All the instantaneous measurements regarding gases are displayed simultaneously and continuous.
The display is divided into four separate fields (quadrants). See Figure 3.
The following information can be read:
• Measurement which is displayed continuously,
• The measuring unit preceding the gas symbol.
In normal operation mode in ambient air, measurement is continuously displayed.
N OTE : Due to cross sensitivities some types of toxic gas sensors are not compatible or reading may be affected.
Example:
• Non-compatible: H2S & NO2, and NO2 & SO2.
• Cross sensitive: CL2 & NO2, and NO & NO2.
For further information contact you local ENMET Corporation distributor or ENMET Corporation.
3.6.1 Using the MX-2100 in Diffusion Mode
W ARNING : MX-2100 sensors must always be unobstructed in order to be able to carry out the measurements correctly.
If obstructed, gas readings could be underestimated and could be fatal to the user.
The persons using the instrument can:
• Use MX-2100 as a stationary monitor by placing the MX-2100 in the vertical position.
According to the type of gas to be detected or liable to be present, the instrument should be placed:
◆ On the ground in order to detect heavy gases (H2S),
◆ At mid-height (about one meter above the ground) or at the outlet of a ventilation port for general detection of a maximum gas
level or monitoring of oxygen,
◆ In a high position for the detection of light gases (hydrogen, methane etc.).
• Use MX-2100 as portable instrument, taking measurements at various locations with a sampling system.
The MX-2100 is fitted with a belt clip or an optional harness can be used. These accessories avoid the sensors being
placed against clothing, so that the gas exchange openings are unobstructed.
N OTE : The detection of some types of gases requires, or are enhanced by, the use of a motorized sampling pump module.
Example: CL2 requires a sampling pump module while HCL, SO2 and NO2 responses are enhanced.
For further information contact you local
ENMET Corporation distributor or ENMET Corporation.
Consult ENMET Corporation regarding monitoring of HF and Ozone.
3.6.2 Using the MX-2100 in Remote Sampling Mode
The MX-2100 can be equipped with a sampling system to measure gas concentrations either in normally inaccessible locations
or before entering places which may be contaminated by gas (such as tanks, sewers or tunnels).
When using Sampler systems:
• Wait for the measurements to stabilize. There may be either overestimated (combustible gases) or underestimated (oxygen)
during sampling because of the movement of air.
• When an electric pump is used, wait a few seconds before reading the measurement. Approximately 1 second for every foot
of tubing or sampling wand. Any fault in the pumping system will be indicated by an audio alarm and the display.
When using a manual pumping systems:
Before taking a reading, wait for the measurements to stabilize. They may be inaccurate while using a hand aspirator due to
pressure fluctuations during each squeeze of the bulb, either overestimated (explosive gases) or underestimated (oxygen) during
manual pumping (with bulb) owing to the movement of air and the bleeding of the system.
C AUTION : If fluids are a possibility in the area to be sampled it is recommended that a hydrophobic filter be added to the sample
pump to prevent fluid from entering the instrument.
3.6.3 Storing histogram measurements
The MX-2100 can store measurements so they can be restored later on a computer.
The Histograms function in the COM2100 software program can be used to output values and events stored by MX-2100
during its operating period to a computer. Resetting of the data contained in the histogram memory can only be performed with
a computer. Turning off the MX-2100 has no effect on stored data.
Operating principle:
To make the best possible use of the data output when histograms are printed, you must understand the operating principle of
data storage.