CAMM
Air Monitor Corporation
116-044-91.P65 (8/31/10)
CAMM - IO&M Manual
3.6 – SPECIAL FUNCTIONS
When used in conjunction with an external input (second transmitter) applied to the special function input terminals,
the CAMM can perform one of the Special Functions listed below. Within the Operator Setup menu, both the external
input and the internal transmitter signals can be individually scaled to achieve a correct weighted basis. The resulting
Special Function output is available as an analog output and/or for the display on the Enhanced Display. When %
Deviation is selected as Special Function Type, contact closure is available for alarm/notification. Special Function
ON/OFF and Type are available and configurable using the Operator Setup menu.
%Deviation
. | EXTERNAL – INTERNAL | / | EXTERNAL |. This function has Alarm Setpoint, Deadband, and Delay
that are configurable via the Operator Setup menu.
Summed Flow
. IN EXTERNAL
Averaged Flow.
(EX INTERNAL) / 2
Delta Flow, Internal - External
. INTERNAL – EXTERNAL
Delta Flow, External - Internal
. EXTERNAL – INTERNAL
Low Select
. Selecting the lesser of the INTERNAL and EXTERNAL signals.
High Select
. Selecting the greater of the INTERNAL and EXTERNAL signals.
3.7 – DATA DISPLAY
The integral display is graphical backlit LCD. It is capable of displaying the transmitter flow, process temperature and
static pressure signals in Engineering units, plus the Special Function option described in Section 3.6. It can also
display a Operator settable I.D. number using any combination of standard ASCII characters. It is also used by the
Operator Setup menu for displaying the menu parameters and values. Configuring the display for
Normal
operation
is done using the Operator Setup menu.
3.8 – K-FACTOR
The CAMM is equipped with a K-factor feature which allows for the introduction of a bias and/or gain factor into the
transmitter's flow calculations. The K-factor feature is intended to be used in two types of applications:
1.
To adjust for flow measurement error as a result of highly distorted airflow induced by upstream or downstream
flow disturbances.
2.
To adjust the transmitter's output to bring it into close correlation with field measured flow data.
The K-Factor gain and bias values can be entered directly or the CAMM can calculate these values based on
measured and reference values from a 1 or 3 point airflow traverse.
3.9 – FLOW/DIFFERENTIAL PRESSURE CALCULATOR
The CAMM is equipped with an integral calculator feature that allows the Operator to determine the maximum flow or
differential pressure from the appropriate variables. This feature allows the Operator to determine input or output
values at various points of the process or new values if the process parameters have changed. Also, the calculator
can be used to implement a single-point density compensation for operating temperature and/or absolute pressure.
3.10 – NETWORK (option)
The CAMM can be provided with optional ModBus TCP/IP over Ethernet for serial data communication.
3.11 – MULTIPLE OPERATING POWER SELECTIONS
The CAMM can be powered by 24VAC, 24VDC, or 120VAC with optional transformer.
3.12 – ENCLOSURE
The CAMM is furnished in a NEMA 1 aluminum enclosure with external, unitary plug in terminal strips for ease of
installation and removal. An optional conduct connection box is available for applications requiring enclosed field
wiring.
4
SECTION 3 – FEATURES
Summary of Contents for CAMM
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