USER MANUALSeptember 2005 Edition 10 >

Visit http: //www.hach.com >

Hach Company, 2002, 2003, 2005. All rights reserved. Printed in the U.S.A.te 09/05 10 ed >

Visit http: //www.hach.com >

Dimensions 11.4 cm dia. x 44.8 cm L (4.5" dia. x 17.625" L) Weight 3.54 kg (7.8 lb) with batteries Enclosure Material PVC Enclosure Rating NEMA 6P (IP67) Operating Temperature Range 18 to 60 ְC (0 to 140 F) Storage Temperature Range Ж 40 to 60 C (Ж 40 to 140 F) Power Source One Energizer EN-529, Alkaline, 6 V dc battery Battery Life 60 days typical, with a 15-minute recording interval, one level and one velocity, one data download per week, at 10 аC (50 F) (also affected by site conditions) User Interface PC MonitoringIntervals 1, 2, 3, 5, 6, 10, 12, 15, 20, 30, 60 minutes Program Memory Non-volatile,...

Dimensions 16.8 cm dia. x 44.7 cm L (6.625" dia. x 17.625" L) Weight 7.5 kg (16.5 lb) with batteries Enclosure Material PVC Enclosure Rating NEMA 6P (IP67) Operating Temperature Range 18 to 60 ְC (0 to 140 F) Storage Temperature Range Ж40 to 60 C (Ж40 to 140 F) Power Source Two Energizer EN-529, Alkaline, 6 V dc batteries Battery Life 90 days typical, with a 15-minute recording interval, one level and one velocity, one data download per week, at 10 аC (50 F) (also affected by site conditions) User Interface PC Monitoring Intervals 1, 2, 3, 5, 6, 10, 12, 15, 20, 30, 60 minutes Program Memory Non-volatile,...

The 910 and 920 Flow Meters are not approved for use in hazardous locations as defined in the National Electrical Code. DANGERAlthough some Hach products are designed and certified for installation in hazardous locations as defined by the National Electrical Code, many Hach products are not suitable for use in hazardous locations. It is the responsibility of the individuals who are installing the products in hazardous locations to determine the acceptability of the product for the environment. Additionally, to ensure safety, the installation of instrumentation in hazardous locations must be per...

1. The Federal Communications Commission (FCC) has established Rules which permit this device to be directly connected to the telephone network. Standardized jacks are used for these connections. This equipment should not be used on party lines or coin lines. 2. If this device is malfunctioning, it may also be causing harm to the telephone network; this device should be disconnected until the source of the problem can be determined and until repair has been made. If this is not done, the telephone company may temporarily disconnect service. 3. The telephone company may make changes in its technical...

The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of all the devices does not exceed 100. > Use only Energizer EN-529, Alkaline, 6 V dc batteries (Cat. No. 3667). Batteries Battery Compartment Desiccant Use a desiccant cartridge to avoid moisture damage to the batteries and electronics. See Desiccant Maintenance on page26 for more...

The accuracy of flow measurements greatly depends on the suitability of the monitoring site. Select sites that have normalized flow and minimal turbulence. Turbulence can make it difficult to detect an average velocity in the flow stream. Obstructions, vertical drops, pipe bends, and elbows can create turbulence and affect the accuracy of your measurements. Table 1 contains suggestions for preventing turbulence. Table 1Suggestions for Preventing Turbulence > Site ConditionSuggested Remedy OutfallsAttach the sensor at least ten times the maximum expected level upstream of the outfall.Vertical...

Submerged Depth/Velocity Sensors Submerged Depth/Velocity sensors can measure level and velocity simultaneously. A submerged pressure transducer measures level. Velocity is measured with sound waves, using the Doppler principle. Wafer Velocity Sensor The Wafer Velocity Sensor (Cat. No. 88005 or 88006) is an extremely low-profile velocity sensor. It does not measure level. The streamlined shape of the wafer probe allows velocity measurement in very low-flow conditions. When used in conjunction with a level sensor (such as the In-Pipe Ultrasonic Level Sensor), you can calculate flow. In-Pipe Ultrasonic...

You can program or retrieve data from your flow meter via modem, DTU II, or direct connection to the RS232 serial port using a PC and one of the following software packages: ? InSight > Data Analysis Software is a Microsoft Windows > ή program for small- to medium-sized flow monitoring jobs. ? Vision > Integrated Sewer System Management Software provides high-end, automated data collection and automated batch report processing, using an unlimited number of meters. Vision is a Microsoft Windows > ή program. > ? Built-in flow equations ? Pager activation upon alarm condition ? 2-way modem and serial...

CAUTION Use care when making modem connections as high voltage may be present on the phone wires! The 920 Flow Meter can be configured with a 14,400 baud, cellular capable internal telephone modem (Cat. No. 4872).These advanced, very low power modems let you communicate with Hach loggers over long distances using public telephone lines or a cellular phone.The 920 Flow Meter modems communicate at speeds from 300 to 14,400 baud. Connect the red and green wires from the logger modem connector to the red and green wires provided by the telephone company. Figure 3Modem Receptacle Pins > Pin LetterDesignationWire...

Pin LetterWire ColorDescription AWhiteNot used.BGroundBlueProvides the ground line that is used in conjunction with the other signals on this connector.CFlow Pulse OutputYellowUsed in conjunction with Pin B (ground) to tell a sampler that a pre-determined amount of flow has accumulated. Rating: +8 V dc. Output current is 100 mA dc (max.) with a duration of 500 ms.DSamplerStartBlackUsed to wake upӔ a wastewater sampler when a level and/or rainfall set-point condition is met so that it can begin sampling. Used in conjunction with Pin B (ground), this line is normally allowed to float and is switched...