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HM28系列 手持式高精度数显差压计 是一款具有多种量程的高精度压力/差压测量手持式仪表。组合了多种功能使得它广泛地用于各种应用场合。功能包括：有所有常用量程范围，显示精度到0.001，差压测量，双显示，可调自动关机时间。
免费提供校准证书。如果需要，HM28可以作为一个压力标准值来校准其它仪表。
? 采用了微处理器
? 差压，表压，或绝压
? 高精度，0.2%, 0.1%, 或0.05%，都带有校准证书
? 可选量程
? 分辨率到0.000
? 峰谷值指示
? 保持功能
? 可编程显示
? 可储存964组数据
? 输出用于打印机或计算机界面
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.
