3000SGT系列 Photohelic三合一差压变送器/开关/表-德威尔Dwyer
3000SGT系列 Photohelic®三合一差压变送器/开关/表组合了关键的控制功能于一体,便于安装。它采用了Dwyer多年积攒的可靠耐用的低压测量技术，能够测量空气或其它兼容气体的正压，负压或差压，精度为2%。差压表是独立显示，面板4英寸，即使掉电，不会影响差压表的现场指示。
另外，两个双刀双掷的开关可用于高低限位控制，额定值为10 A @ 28 VDC or 120/240 VAC，设定点的回差大约一个指针宽度-小于满刻度的1%。正好保证方便控制，避免震荡。自带的保持线圈可以让用户把两个开关变成一个可以自由调整回差的单个开关，*适用于洁净室，建筑物压力控制，暖通空调系统，空气过滤器，液位等等控制系统。可采用前面板上的旋钮和红色的设定点指针，在在量程的满范围内调整设定点。
*后,3000SGT系列 Photohelic®包括有单独的4-20mA两线制输出变送器，采用10-35VDC供电，在后部带有零点和量程调节功能。可选择A-700电源板直接连接100-240V交流电，输出24-28V。此变送器*适合用于在变风量调节系统中来控制风机，或调整风门。将所有的控制和显示功能合为一体，除了明显的节约造价，减少安装空间的好处外，它还将取压管线由过去的三组或四组减少到一组，大大地节约了安装材料和安装时间.
GAGE SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: See model chart on catalog page.
Pressure Limits: See model chart on catalog page.
Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).
Process Connections: 1/8" female NPT.
Size: 4" (101.6 mm) dial face, 5" (127 mm) O.D. x 8-1/4" (209.55 mm).
Weight: 3 lb. 14.5 oz (1.77 kg).
SWITCH SPECIFICATIONS
Switch Type: Each set point has 2 Form C relays (DPDT).
Repeatability: ±1% of full scale.
Electrical Rating: 10A @ 24 VDC or 120 VAC, 6A @ 240 VAC.
Electrical Connections: Screw terminals.
Power Requirements: 120 VAC, ±10%.
Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.
Set Point Adjustment: Adjustable knobs on face.
TRANSMITTER SPECIFICATIONS
Accuracy: See model chart on catalog page.
Temperature Limits: 20 to 120°F. (-6.67 to 48.9°C).
Pressure Limits: See model chart on catalog page.
Thermal Effects: ±0.025% F.S./°F (0.045% F.S./°C).
Power Requirements: 10.0 to 35 VDC (2-wire).
Output Signal: 4-20 mA DC.
Zero & Span Adjustments: Multi-turn potentiometers, internally accessible.
Response Time: 250 mSec.
Loop Resistance: 0 - 1250 ohms.
Current Consumption: 38 mA DC, maximum.
Electrical Connections: Terminal block.
Warm-up Time: 10 minutes.
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