HM28系列 手持式高精度數顯差壓計是一款具有多種量程的高精度壓力/差壓測量手持式儀表。組合了多種功能使得它廣泛地用于各種應用場合。功能包括：有所有常用量程范圍，顯示精度到0.001，差壓測量，雙顯示，可調自動關機時間。
免費提供校準證書。如果需要，HM28可以作為一個壓力標準值來校準其它儀表。
• 采用了微處理器
• 差壓，表壓，或絕壓
• 高精度，0.2%, 0.1%, 或0.05%，都帶有校準證書
• 可選量程
• 分辨率到0.000
• 峰谷值指示
• 保持功能
• 可編程顯示
• 可儲存964組數據
• 輸出用于打印機或計算機界面
Pressure Connection: Hose; 4/6 mm or 1/8" NPT.
Accuracy: (Includes linearity, hysteresis, and repeatability): per order code. ±0.20% full scale ±1 digit. ±0.10% full scale ±1 digit. ±0.05% full scale ±1 digit.
Wetted Materials: 18/8 stainless steel.
Temperature Limits: 23 to 122°F (-5 to 50°C).
Storage Temperature: -4 to 140°F (-20 to 60°C).
Humidity: 30 to 95% rH, non-condensing.
Display: 2 line, 16 character, dot matrix LCD, with switchable display sizes.
Power Requirements: 9 V alkaline battery, installed functional, user replaceable. Can operate from external power supply of 7 to 14 VDC.
Current Consumption: <9 mA.
Memory: 964 measured values. Recording intervals adjustable from manual, 1, 5, 10, 20, 30 seconds, 1, 2, 3, 5, 10, 30, 60 minutes.
Case Protection: IP54 (NEMA 3).
Case Dimensions: 6" x 3.27" x 1.34" in (152 x 83 x 34 mm).
Weight: 9.5 oz (270 g).
Maximum Measurement Rates: Stand alone: 2-1/2 readings/sec (0.1% and 0.05% ratings), 5 readings/sec (0.2% rating). Output to RS-232: 20 measurements/sec (0.2% rating). 10 measurements/sec (0.1% and 0.05% ratings).
RS-232 Baud Rate: Adjustable, 1200, 2400, 4800, or 9600 baud.
Agency Approvals: CE.
Service: Air and compatible gases.
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