Sierra Monitor Corporation Sentry 1260 Series - Manual (Page 2)

1991 Tarob Court, Milpitas, CA USA 95035 Phone: 408-262-6611 Fax: 408-262-9042
(800) 727-4377 Email: [email protected] www.sierramonitor.com
ACCESSORIES
ACCESSORIES
SAMPLE DRAW PRODUCTS
Sample draw products are used in applications in which
the sensor cannot be installed directly at the gas sensing
location due to poor accessibility or the harshness of the
environment. Sample is continuously drawn from the sens-
ing location to the sensor at a more suitable location.
The primary component of the sample draw product is a
venturi manifold that uses a continuous flow of driver air to
pull a slight vacuum through the sample supply line draw-
ing the sample into the manifold cavity connected to the
sensor.
5399-01 Sample Draw Fitting
The sample manifold assembly is the 5399-01 Sample
Draw Fitting. Sample stream draw and flow control is pro-
vided by the user.
5398-01 Sample Draw Assembly
The 5398-01 is a complete sample draw assembly includ-
ing the sample draw fitting, driver air, sample and exhaust
fittings and flow metering assembly. This allows accurate
adjustment of sample flow using the signal flow meter lo-
cated on the flow metering assembly.
5398-02 Sample Draw/Dilution Assembly
The 5398-02 is used in applications in which the expected
gas concentration is either higher than the maximum range
of the sensor or sufficiently high to significantly reduce sen-
sor life with extended exposure. This assembly adds a
second flow meter for control of dilution air. Adjustment of
sample and dilution air flow meters determines the dilu-
tion ratio. Concentrations displayed on the Sentry Con-
troller must then be multiplied by the dilution factor to ar-
rive at actual concentrations.
SENSOR MOUNTING PRODUCTS
5311-00 Rainshield
The Rainshield is mounted over the sensor head to pro-
tect the sensor from direct exposure to rain, hosedown
and other splashing liquids.
5394-00 Duct Mount Fitting
The Duct Mount Fitting facilitates installation of the gas
sensor module onto an air duct. The fitting also includes
the 5360-00 calibration gas delivery fitting so that calibra-
tion gas can be delivered to the sensor with out removing
the module from the duct.
CALIBRATION ADAPTERS
The Sentry system is designed for easy calibration of the
sensor modules. The standard calibration adapter screws
over the head of the sensor. Then calibration gas is fed
through a tube connected onto the adapter.
Magnetic calibration adapters are commonly used with
Sentry gas sensor modules. The magnetic calibration
adapter is used to control a switch inside the sensor mod-
ule. When the adapter is first applied to the sensor the
switch closes to indicate the start of calibration and the
zero gas stage. The second time the adapter is applied to
the module, the switch closure indicates that span gas is
being applied. When the magnetic adapter is removed,
the module knows that calibration is complete and sends
the appropriate signal to the controller.
5398-01
5360-00
5394-00
© 2002 Sierra Monitor Corporation
ACCESSORIES
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