DH系列 Digihelic 差压控制器-德威尔Dwyer
DH系列 Digihelic®差压控制器是将数显差压表，差压开关和差压变送器组合在一起的三合一产品，将多个功能合为一体，可减少库存，节约安装的时间和成本。Digihelic®差压控制器*适用于监控风压，风速和风量的应用场合，精度为0.5%，量程范围从0.25到100英寸水柱。
Digihelic®差压控制器可现场选择各种压力，风速和风量等工程单位。两个单刀双掷的开关，可调回差，可对应4-20mA进行量程迁移，在风速或风量测量时采用线性的开方输出。DH系列在电源的使用上极具灵活性,供电电源可使用120/220VAC,也可使用控制室常用的24VDC电源。
使用菜单按键可编程配置各种功能：安全级别选择；风压风速风量选择；工程单位选择；皮托管K系数选择；矩形或圆形管选择；设定点和报警选��；高，低或高/低报警设定；自动或手动复位；报警延时；查看峰谷值；数字阻尼调整；量程迁移；Modbus®通讯和现场校准等。
它将所有功能汇聚到一个产品，能用于所有差压监控应用场合，这就是为什么DH系列是你的唯一选择的原因。
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Material: ABS plastic, UL approved 94 V-0.
Accuracy: ±0.5% at 77°F (25°C) including hysteresis and repeatability.
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 - 7VA max.
Output Signal: 4-20 mA DC into 900 Ω max.
Zero & Span Adjustments: Accessible via menus.
Response Time: 250 ms.
Display: 4 digit LCD 0.4" height. LED indicators for set point and alarm status.
Electrical Connections: Screw terminals.
Process Connections: Compression fitting for use with 1/8" ID X 1/4" OD tubing (3.175 mm ID x 6.35 mm OD). Optional barbed fitting for 3/16" ID tubing.
Enclosure Rating: Face designed to meet NEMA 4X (IP66).
Mounting Orientation: Mount unit in horizontal plane.
Size: 1/8 DIN.
Panel Cutout: 1.772 x 3.620 in (45 x 92 mm).
Weight: 14.4 oz (408 g).
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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