地表水监测仪器Systems designed for long-term monitoring of surface water

Measuring Water Level

Our systems use 6-wire resistive gages or vibrating-wire pressure transducers for measuring groundwater level. In deep observation wells, these pressure transducers provide accurate water level measurement. We use piezometers, bubblers, or float and pulley systems to measure water level in shallow water applications. On the high end of groundwater level measurements, our portable pump and slug test systems can simultaneously measure water level in up to 8 wells, yet are easy to setup and customize from site to site.

For surface water level, measurements are often made in a vertical stand-pipe (stilling well) installed adjacent to a lake, river, or stream. The stream level (stage) is the same as the water elevation in the stilling well. A float and pulley is often used, but pressure transducers, ultrasonic, and resistive tape sensors work well also. Self-calibrating double bubblers are accurate sensors for measuring water level, and have the added benefit of keeping the sensor out of the measured liquid—critical in corrosive environments.

测量水流

水flow is usually calculated using a structure built across an open channel, such as a weir or flume. The water level is measured as it flows through the structure. Discharge rates are determined by using a site-unique rating curve and the water level. A float and pulley system, strain gage pressure transducer, or ultrasonic sensor may be used in stilling wells to measure water level fluctuations, then calculate flow.

New sensors that use ultrasonic and Doppler technologies to measure water velocities in two or three dimensions are also available. Velocity is measured directly; additional calculations are not required.

水位和流量测量的数据记录仪

我们的数据记录仪的多功能性允许为每个应用程序定制系统。可用的一系列数据记录仪具有越来越多的功能。我们所有的数据记录仪都具有广泛的工作温度范围，低功耗以及与各种传感器直接接口的能力。由于我们的数据记录器可在电池（带有或不使用太阳能电池板）上运行，因此它们非常适合长期独立操作，例如在遥控静止的井中。如果需要其他通道，我们的大多数数据记录仪都可以使用多路复用器和其他外围设备扩展。功能强大的车载指令集允许根据时间或条件事件进行无人值守的控制决策。例如，如果测得的级别不在预定范围之外，则数据记录仪可以发出警报，敞开的阀门或门，或者呼叫到电话报告条件。数据通常显示并存储在所需的度量单位中（例如CFS，PSI，脚，英寸，米，厘米，厘米）。

Sensors for Water Level and Flow Measurements

由于它们可以测量多种频道类型的能力，我们的数据记录仪几乎可以读取几乎每个市售的传感器，从而可以为每个安装定制系统。我们提供各种水位和流动传感器，具有低漂移和高可靠性。此外，通常可以测量几乎所有可用的水质和气象传感器，通常没有外部信号调节。我们帮助创建了原始的SDI-12标准，因此您可以确保我们的系统与SDI-12兼容。

Communications

多次电信和现场选项可用于检索数据，还可以定制系统以满足确切的需求。现成的电信选项包括卫星（DCP），广播，电话，手机和语音合成的手机。可以通过呼叫计算机，电话，收音机或寻呼机来编程系统以发送警报或报告站点条件。可以使用Campbell Scientific软件显示或处理实时或历史数据。数据也可以作为ASCII文件导出，以通过电子表格，数据库或分析程序进行进一步处理。