DH3系列 微差壓控制器
和Photohelic®尺寸一樣的數顯微差壓控制器，有用于流量測量的開方輸出
DH3系列 Digihelic®微差壓控制器是一款三合一的組合儀表，它將數顯表，控制開關和變送器組合成一體。這樣組合不僅僅節約了倉儲空間，還節省了安裝費用和時間。Digihelic®微差壓控制器zui適用于測量差壓，風速或風量的應用場合。量程低至0.25到2.5英寸水柱的范圍時精度為1%，量程大于或等于5英寸水柱時的精度為0.5%，還可以有正負組合量程。
Digihelic®微差壓控制器可選各種通用的壓力，風速，風量工程單位，它帶有2個單刀雙擲的開關，可調回差，并且還輸出可對應量程的4-20mA輸出信號。
采用面板上的按鍵編程配置非常容易：安全設置，工作方式選擇（壓力，風速或風量），工程單位選擇，K系數選擇，圓管方管選擇，報警設定點設置，手動自動復位選擇，報警延遲，峰谷值記錄，數字阻尼，4-20mA對應量程等等。
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: 12-28 VDC, 12-28 VAC 50 to 400 Hz.
Power Consumption: 3 VA max.
Output Signal: 4-20 mA DC into 900 ohms 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 amp @ 30 VAC/VDC.
Set Point Adjustment: Adjustable via keypad on face.
