EW-32680-14 控制器-产品快照

产品介绍

EW-32680-14 控制器

Mass flow controller, digital, for air, 0 to 2 L/min

Control and monitor up to 256 devices on a single bus network Stores NIST-traceable calibration data for up to 10 gases, eliminating the need for multiple controllers on systems running diverse batch processes Controllers feature exceptional repeatability that reduces quality deviations in any process that requires multiple devices The flexible design also functions in traditional analog mode with 0 to 5 VDC signals Through the use of digital signal processing, this design offers outstanding unctionality and performance. Using a PC-based RS-485 interface, all parameters are easily programmed and updated for this device. For those users with systems operating on traditional signals, the various calibration benefits of this design can still be utilized through the unit’s capability to operate with traditional 0 to 5 VDC analog signals. The flowmeter element of these controllers features an advanced straight-tube sensor that ensures accurate and repeatable results. Gas flow measurements are unaffected by moderate temperature and pressure variations at the inlet. To further improve accuracy, each of the 10 different NIST-traceable calibrations* can be linearized around a 10-point curve. For less critical applications that can tolerate accuracies of ±3% full scale, users may select from any one of 256 mathematically determined calibration factors to match the particular gas being controlled. Once calibrated, an auto zero feature utilizes an automatic balancing circuit that eliminates zero and span drift. Enhancing performance of the PID control function, the device incorporates an adaptive PID feature through its autotune capability. This automatically sets the control response to the specific process without the user having to go through the lengthy process of determining the PID parameters. Further improving the unit’s performance is the use of local internal memory for control calculations. This feature improves the controller’s response time and reduces data loading on the control network. For control of external devices, these controllers have two SPDT relays (user settable for normally open or normally closed). The relays can be programmed to switch based on a full range of flow or totalizer set points. Other control features include a programmable cycle function that can be set to run up to 12 independent steps; the cycle can also be set to operate in a loop for repeating processes. Wetted parts include 316 stainless steel (SS), 416 SS, and Viton®. Buna-N, neoprene and Kalrez O-rings are available as an option. A 40-micron inlet screen for particulate is included. Note about accuracy: These controllers operate and maintain the stated full-scale accuracy and linearity at inlet pressures between 10 and 60 psi (0.70 to 4.10 bars) and gas temperatures between 59 and 77°>F (15 to 25°>C). If operating outside 10 to 60 psi, add ±0.01%/psi full-scale (±0.145%/bar); if operating outside 59 to 77°>F, add ±0.08%/°>F full-scale (±0.15%/°>C). *One NIST-traceable calibration certificate is included with each device. Additional calibrations may be ordered as an option. Meters can transmit the following units of measure: % of full scale, mL/min, mL/hr, scfm, scfh, sL/min, sL/hr, and one user defined unit of measure. RS-232 models are available upon request—call our Application Specialists.

Specifications Product Type Mass Flow Flowmeters Description Mass Flowmeter Max operating temperature (º F) 122 Max operating temperature (º C) 50 Max pressure 500 psi Accuracy ±1% full-scale including linearity (see below for details) Max particulate size 100 microns NIST-certified Yes Output linear 4 to 20 mA (300 ohm max); 0 to 5 VDC (2000 ohm minimum); 0 to 10 VDC (4000 ohm minimum) Pressure drop at maximum flow (PSID) 1.06 Process connection 1/4" compression fittings Repeatability ±0.15% full scale Fluid Type Viscous Dimensions 5"Wx6-1/2"Hx1-1/8"D Power ±15 VDC; 15 watts maximum

Discontinued Items Network-Ready Flow Controllers with DSP