CAMS™

Product Type: Transmitter / Automatic Purge Combination System
Technology Type: Electro-pneumatic system (requires 80-120 psig compressed air)

Reduce maintenance cost and time with clean sensing ports purged automatically with CAMS™ (CAMM™ + AUTO-purge III).

The Air Monitor Power CAMS™ – Combustion Airflow Management System – is designed to fulfill the need for a reliable and accurate means of flow measurement in combustion airflow applications. Combined into a single engineered package are the CAMM™ – Combustion Airflow Management Module – containing the microprocessor-based instrumentation to measure the airflow and manage the purge cycle, and AUTO-purge III to protect against any degradation in performance of the duct mounted measurement device(s) due to the presence of airborne particulate.

Reduced maintenance costs
Increase process efficiency

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Explore Air Monitor’s Custom Panel Capabilities

This customer-specific VELTRON II + AUTO-purge III panel illustrates Air Monitor’s ability to integrate airflow instrumentation and automatic purging. The featured configuration differs from the CAMM™ + AUTO-purge III package described on this page.

Features and Benefits:

Accuracy. The CAMM™ is designed to maintain a measurement accuracy of ±0.1% of Natural Span. For a span of 0 to 0.05 IN w.c., this accuracy is equivalent to an output accuracy of ±0.00005 IN w.c. differential pressure or ±0.45 FPM velocity at Natural Span.
Continuous Display of Process. All CAMMs are equipped with a large multi-line, backlit, graphical 5×20 LCD for use during transmitter configuration and calibration, and to display multiple measured process variables (Flow, Temperature, Absolute Pressure, Differential Pressure, or Special Function). For high visibility, the main process variable (flow) is displayed with easy-to-read, triple-size digits. Other process variables are displayed with standard size digits. Each measured process variable is individually scalable in user selectable engineering units.
Special Functions Capability. Built into the CAMM™ micro-processor is the capability to perform special application functions involving two transmitters. Using a second transmitter as an input, the CAMM™ can compute the sum of, or differential between the two measured flows. The special function output can be both displayed and provided as an analog output signal.
Microprocessor Based Functionality. The CAMM’s™ on-board microprocessor performs the functions of operating parameter selection, transmitter configuration, input/output and display signal scaling, density correction, and transducer calibration.
Keypad. A cover mounted keypad provides instant access to all CAMM™ configuration menus and calibration functions. The durable membrane keypad is user configurable for password protection.
ModBus Network Communication. Each analog input and output signal can be individually configured for 0-5VDC, 0-10VDC or 4-20mADC by means of a single jumper.
High Turndown Ratio Operation. The CAMM™, with its high level of accuracy and automatic zeroing circuitry, can maintain linear output signals on applications requiring flow measurement turndown of 10:1.
Primary Signal Noise Filter. To eliminate background noise and pulsations from the flow signal, the CAMM™ is equipped with a user selectable digital low pass filter.
Air Density Correction. The CAMM™ can perform density compensation for both air temperature and air pressure variations. Temperature input is an analog signal from a remote temperature transmitter; non-linear temperature inputs can be linearized by the microprocessor. Process pressure is measured by means of an internal absolute pressure transducer connected to the transmitter static pressure signal input.
Optional Rapid Stop™. The Rapid Stop™ valving combined with purge sequence timing in the CAMM™ permits a reduction of the recovery portion of an AUTO-purge cycle from a typical 30 seconds to as short as 5 seconds.
Built-in Characterization Function. For installations requiring a field characterization factor (K-factor) the CAMM™ has an integral “K-factor” calculator with gain and/or bias, or multi-order polynomial function to accurately match field testing results throughout flow turndown..

SPECIFICATIONS

PERFORMANCE SPECIFICATIONS
Accuracy:	±0.1% of Natural Span, including non-linearity, hysteresis, and non-repeatability.
Stability:	±0.5% of Natural Span, including non-linearity, hysteresis, and non-repeatability.
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OPERATING SPECIFICATIONS
Temperature Effect:	Zero. Corrected by AUTO-zero. Span. 0.015% of Full Span/ºF.
Mounting Position Effect:	None. Corrected by AUTO-zero.
Transducer Response Time:	0.5 second to reach 98% of a step change.
Power Consumption:	35VA at 24VAC, 20VA at 24VDC, and 42VA at 120VAC.
Digital Output:	Form “A” dry contacts (maintained) for AUTO-purge activation and acknowledgment.
Digital Inputs:	External dry contact closure for AUTO-purge external start and purge interrupt commands.
Analog Outputs:	Four outputs for flow, temperature, absolute pressure, and special function individually configurable via jumper for 0-5VDC, 0-10VDC or 4-20ADC.
Analog Inputs:	Dual inputs are field configurable via jumper for 0-5VDC, 0-10VDC, or 4-20mADC. One is reserved for temperature input; the other for use with optional special function.
Network Communication:	Optional ModBus TCP/IP over Ethernet.
AUTO-purge Management:	The AUTO-purge cycle is initiated via an external dry contact input, or via the CAMM timer, with field selectable frequencies of 1 to 24 hours in 1 hour increments. A pair of CAMM dry contacts control the AUTO-purge System, and third dry contact provides remote purge activation acknowledgment.
Power Supply:	Standard 24VAC (20-28VAC) or 24VDC (20-40VDC), with automatic selection. Optional 120VAC (100-132VAC) via external UL listed transformer.
Overpressure and Static Pressure Limit:	25 psig.
Low Pass Filtration:	Response time to reach 98% of a step change is adjustable from 2.0 to 250.0 seconds.
Automatic Zeroing:	Accuracy within 0.1% of calibrated span. Frequency. Every 1 to 24 hours selectable on 1 hour intervals.
Circuit Protection:	Power input is fused and reverse polarity protected.
Span and Zero Adjustment:	Electronic adjustment via keypad.
Display:	Backlit, graphical LCD provides indication of up to four process variables. Triple-size digits for main process variable, standard size characters for the other process variables.
Temperature Compensation Selection:	Push-button selection of linearized or nonlinear input. Choice of thermocouple (Type E, K, J, and T) or 100 ohm platinum RTD temperature sensor type.
Pressure Compensation:	Absolute pressure (atmosphere or duct static), up to 60″Hg.
Humidity Limits:	0-95% RH, non-condensing.
Temperature Limits:	–20ºF to 180ºF Storage. +40ºF to 140ºF Operating.
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PHYSICAL SPECIFICATIONS
Standard Construction:	Brass and Copper Construction: – All wetted tubing, fittings, and valves constructed of copper and/or brass. – Enclosure is NEMA 4 painted steel – External connection fittings are stainless steel FPT. Stainless Steel Construction: – All wetted tubing, fittings, and valves constructed of 316 stainless steel. – Enclosure is NEMA 4 painted steel. – External connection fittings are stainless steel FPT.
Optional Construction:	Brass and Copper Construction: – NEMA 4X Stainless Steel Enclosure. – Vortex Cooler (requires 80-100psi air supply) – Rapid Stop™ – Enclosure Heater (requires 120VAC power supply) -Viewing window. – Special functions: * Summed flow * Differential flow – Power: * 24VAC * 24VDC * 120VAC – Certification: * Standard * NIST-traceable

Applications:

— Combustion Airflow Processes:
- — Power Boilers
- — Combination / Biomass Boilers
- — Recovery Boilers
- — CFBs
- — Fired Heaters
- — Foundry Kilns (Lime, Ceramic, Cement)
- — Thermal Oxidizers
— Dirty Airflow processes:
- — Pneumatic Conveyors
- — Primary Air for Pulverized Coal
- — Paper Drying
- — CNCG & HVLC
- — Dust Collection Systems
- — Cement
- — Quench Exhaust
- — Paint Spray Booths
- — Fluidized Bed Dryers / Coaters
- — Rotary Drum Dryers / Coaters

Best in Class Value Proposition:

Industry leading transmitter measurement accuracy for low DP ranges typical of air and gas flow applications.
Shortest straight run requirements in the industry.
Non-uniform flow profile problem solved: highest density of sensing point + patented measurement technology = excellent airflow measurement accuracy.
Dirty applications are no problem with AUTO-purge III feature.
Excellent long-term stability, repeatability, and unmatched accuracy when used with Air Monitor’s family of flow computers featuring AUTO-zero circuitry.
Available field start up services.