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DH3系列 Digihelic®微差压控制器是一款三合一的组合仪表，它将数显表，控制开关和变送器组合成一体。这样组合不仅仅节约了仓储空间，还节省了安装费用和时间。Digihelic®微差压控制器*适用于测量差压，风速或风量的应用场合。量程低至0.25到2.5英寸水柱的范围时精度为1%，量程大于或等于5英寸水柱时的精度为0.5%，还可以有正负组合量程。
Digihelic®微差压控制器可选各种通用的压力，风速，风量工程单位，它带有2个单刀双掷的开关，可调回差，并且还输出可对应量程的4-20mA输出信号。
采用面板上的按键编程配置非常容易：安全设置，工作方式选择（压力，风速或风量），工程单位选择，K系数选择，圆管方管选择，报警设定点设置，手动自动复位选择，报警延迟，峰谷值记录，数字阻尼，4-20mA对应量程等等。
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Material: Die cast aluminum case and bezel.
Accuracy: ±1.5% for 0.25" and ±0.25" w.c. ranges. Ranges 0.5" to 5" w.c. and corresponding bi-directional (except ±2.5" w.c.) ±1%; All other ranges: ±0.5% @ 77°F (25°C) including hysteresis and repeatability (after 1 hour warm-up).
Stability: < ±1% per year.
Pressure Limits: Ranges ≤ 2.5 in w.c.: 25 psi; ±2.5", 5 in w.c.: 5 psi; 10 in w.c.: 5 psi; 25 in w.c.: 5 psi; 50 in w.c.: 5 psi; 100 in w.c.: 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). For 0.25" and ±0.25" w.c. ranges: ±0.03%/°F (±0.054%/°C).
Power Requirements: 12 to 28 VDC, 12 to 28 VAC 50 to 400 Hz.
Power Consumption: 3 VA max.
Output Signal: 4 to 20 mA DC into 900 Ω max.
Zero & Span Adjustments: Accessible via menus.
Response Time: 250 ms (damping set to 1).
Display: Backlit 4 digit LCD 0.4" height LED indicators for set point and alarm status.
Electrical Connections: 15 pin male high density D-sub connection. 18" (46 cm) cable with 10 conductors included. 4' and 10' cables available.
Process Connections: 1/8" female NPT. Side or back connections.
Mounting Orientation: Mount unit in vertical plane.
Size: 5" (127 mm) OD x 3-1/8" (79.38 mm).
Weight: 1.75 lb (794 g).
Agency Approvals: CE.
SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 1 A @ 30 VAC/VDC.
Set Point Adjustment: Adjustable via keypad on face.
