DHII系列 Digihelic 微差压控制器-德威尔Dwyer
DHII系列 Digihelic®微差压控制器 组合了标准的微差压控制器的所有功能，防护外壳的级别达到NEMA 4 (IP66)。
它组合了2个单刀双掷的开关，4-20mA输出，Modbus通讯，4位LCE大屏显示于一体。可移除的接线排很方便地在外部接线后再直接卡入电路板上，方便简单，节约了安装时间。
DHII系列 Digihelic®微差压控制器的NEMA 4 (IP66)的防护使得它可用于室外安装，特别是用于楼顶安装的空气处理机。它也可采用表面安装的方式用于洁净室，或其它特殊的场合。
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Material: Aluminum, glass.
Accuracy: ±0.5% at 77°F (25°C) including hysteresis and repeatability (after 1 hour warmup).
Stability: < ±1% per year.
Pressure Limits: Ranges ≤ 2.5 in w.c. = 2 psi; 5": 5 psi; 10": 5 psi; 25": 5 psi; 50": 5 psi, 100": 9 psi.
Temperature Limits: 32 to 140°F (0 to 60°C).
Compensated Temperature Limits: 32 to 140°F (0 to 60°C).
Thermal Effects: 0.020%/°F (0.036/°C) from 77°F (25°C).
Power Requirements: High voltage power = 100 to 240 VAC, 50 to 400 Hz or 132 to 240 VDC; Low voltage power = 24 VDC ±20%.
Power Consumption: Low voltage power = 24 VDC - 130 mA max; High voltage power = 100 to 240 VAC, 132 to 240 VDC - 7 VA max.
Output Signal: 4-20 mA DC into 900 Ω max.
Zero & Span Adjustments: Accessible via menus.
Response Time: 250 ms (dampening set to 1).
Display: 4 digit backlit LCD 0.6" height. LED indicators for set point and alarm status.
Electrical Connections: Euro type removable terminal blocks with watertight conduit fittings for 1/2" watertight conduit.
Process Connections: 1/8" female NPT.
Enclosure Rating: Designed to meet NEMA 4 (IP66).
Mounting Orientation: Mount unit in horizontal plane.
Weight: 2 lb 10 oz (1.19 kg).
Serial Communications:
Modbus® RTU, RS485, 9600 Baud.
Agency Approvals: CE, UL.
SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 8 amps at 240 VAC resistive.
Set Point Adjustment: Adjustable via keypad on face.
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