Rev. K | 2018.02
YESAIR Operation Manual
© 2018 All rights reserved. Data subject to change without notice.
13
4 SENSOR SPECIFICATIONS
4.1 Overview
The YESAIR has the capacity for 7 internal sensors – one temperature sensor,
one RH sensor and 5 plug and play gas sensors; plus one remote sensor such as
the YESDUST Particulate Sensor.
The YESDUST is connected via the auxiliary port and is a general purpose
particulate sensor that counts particulates between 1 and 10 microns in size. The
YESDUST uses the YESAIR’s data logging capabilities to record data and adds
this information to the log file along with the YESAIR’s data records. If you would
like more information on the YESDUST please visit our website.
NOTE: Neither the YESAIR nor the YESDUST are intended for use in clean
room applications.
The YESAIR has plug and play smart sensors and placement of those sensors is
an important consideration. With the display facing you, look at the top of the
YESAIR and you will see five gas sensor sockets. The three sockets closest to the
back edge are for electrochemical toxic gas sensors, with SLOT 2 configured
specifically for an Oxygen sensor. SLOTS 4 and 5, towards the front edge are for
CO2, PID or combustible gas sensor types. If a Nitric oxide (NO) sensor requiring
electronic bias within the circuit is used, it must be fitted to one specific sensor
location (left rear position, determined by looking at the front of the instrument).
Two sensors requiring bias cannot be fitted in the same instrument at the same
time. Reference the photo in
9.2 Sensor Location Restrictions
.
Sensors can be added or changed as required. However, an instrument that is
configured for Nitric oxide, Hydrogen chloride, Ethylene oxide, Hydrazine or
Formaldehyde cannot be swapped with a different sensor type without hardware
modification and cannot be placed in any other socket than SLOT 1 or 3. If this
change is desired, the unit needs to be sent back to the factory to be reconfigured.
Sticky gas sensors (ie. Chlorine (Cl
2
), Hydrogen chloride (HCl), Ozone (O
3
),
Hydrogen fluoride (HF), Fluorine (F
2
)) used in the Pump model should be installed
in SLOT 1, closest to the inlet port for calibration. The shorter the distance the
sticky gas needs to travel, the more accurate the calibration will be.
If the YESAIR is ordered with only a couple gas sensors, the unused sockets will
be populated with a dummy sensor plug to ensure a good seal and circulation of
air for sensing purposes. The dummy sensor plugs can be removed and replaced
with gas sensors as mentioned above, and vice versa. To remove a dummy
sensor plug, gently push inwards and turn, releasing the plug from the socket.
See section
9.1 Dummy Sensor Plugs.