Introducing the next generation Hydra-Pulse 275 - a continuous non-contact water level measurement sensor that is versatile, easy to use and program. Installation is simple and since the sensor measurement is non-contact (installed above the water) accurate water level measurements can be taken even in flood conditions without possibility of damage to the sensor. The new Hydra-Pulse 275 has a proven mean time between failure (MTBF) of more than 50 years, and is the most accurate in the industry with a measure-ment accuracy of ±2 mm up to 246 ft (75 m).

HYDRA-PULSE 275 SDI -12 Non-Contact Radar Level Sensor

• Industry best ±2 mm accuracy to a measuring distance of 246 ft (75 m)• Accuracy unaffected by rain, humidity, dust, temperature or vibration• 4-20mA & HART • Optional dual SDI-12 outputs (with HartBeat & HartBeat Plus)• Remote sensor configuration (with HartBeat Plus)• Completely waterproof and dustproof• 50+ years Mean Time Between Failure (MTBF) • Corrosion resistant powder coated aluminum housing • 316L Stainless Steel Mounting & Levelling Flange• Completely maintenance free• Easy installation

OVERVIEW

FEATURES

MEASURING RANGE: 246 ft ACCURACY: ±2 mm

The Hydrological Services HART to SDI-12 / Modbus Interface allows any 4-20mA HART device to be connected to an SDI-12 Data Logger and/or an RS485 Modbus RTU providing the best accuracy available from the HART protocol.

HartBeat

All the features of the HartBeat with additional high quality LCD display. The Hydrological Services HART to SDI-12 Interface allows any 4-20mA HART device to be connected to an SDI-12 Data Logger and/or an Analog RTU providing the best accuracy available from the HART protocol.

HartBeat Plus

Radar Configuration with the HartBeat Interface

Radar Configuration with the HartBeat Plus Interface

In continuous non-contact level measurement with radar, the sensor sends microwave signals towards the water from above. The surface of the water reflects the signals back in the direction of the sensor. Using the received microwave signals, the sensor determines the distance to the product surface and calculates the level from it.

The adjustment of the Hydra-Pulse is carried out via the display module or via a PC with the adjustment software PACTware and corresponding DTM. Further adjustment options are possible via a HART Communicator such as the HartBeat and HartBeat Plus.

Hydra-Pulse 275Available as a standalone with 4-20mA output or combine with SDI-12 ‘HartBeat’ interface for additional flexibility and features

Measure from 1 to 246 ft from a bridge or the riverbank

LCD Display

Measuring Range 0-246 feet or 0-75 meters

Accuracy ±2 mm

Sensor Output 4-20mA, HART

Operating Temperature -196°F to 450°F

Storage Temperature -40°F to 176°F

Power Supply 9.6 to 36V DC

Mounting Thread from G1 1/2; 1 1/2 NPT; flanges from DN 40, 1 1/2”

Power +9.6V to +30V DC

Over voltage protected with resettable polyfuse

Reverse polarity protection

Powers down Hart interface to conserve power

HART Interface +16V DC (Even when power source is+9.6V)

Current limited to 30mA - in the event of a short circuit

Interface #1 SDI-12 available on all units (conforms to SDI-12 V1.3)

Interface #2 Select via DIP switch 1-2, either:

1. SDI-12 V1.3 OR

2. RS485 (2 wire) Modbus interface

Operating Temperature -40°F to 176°F

Environmental IP65

Dimensions 4.75” x 3.25” x 2.25” (W x H x D)

Power +9.6V to +30V DC, Over voltage protected with resettable polyfuse

Reverse polarity protection

Powers down Hart interface to conserve power

HART Interface +16V DC (Even when power source is +9.6V)

Current limited to 30mA - in the event of a short circuit.

Interface #1 Dual SDI-12

Interface #2 4-20mA

LCD Display 16 char x 2 line backlit LCD

HartBeat

HartBeat Plus

Hydrological Services America3550 23rd Ave S. Suite 5

Lake Worth, FL 33460Phone: +1 (561) 459–4876 Fax: +1 (561) 582–0049

email: sales@hydrologicalusa.comwww.hydrologicalusa.com

Indicators LED 1 Blue = HART Comms Red = Battery low Green = Battery ok

LED 2 Red = SDI-12 #1 comms

LED 3 Red = SDI-12 #2 commsGreen = Modbus comms

User Selectable Options Internal DIP Switches

Sw 1-1 RS485 Modbus / SDI-12 #2

Sw 1-2 HS Comms / Modbus Comms

Sw 1-3 Request Meas /Auto Measure

Sw 1-4 Normal Op / External HART Config

Connections Plug-in 12 way screw terminals:

1. Earth/Shield 7. 0V DC

2. 4-20mA + (Hart+) 8. SDI-12 #2

3. 4-20mA - (Hart-) 9. 0V DC

4. +9.6V to +30V DC 10. RS485+ (Modbus)

5. 0V DC 11. RS485- (Modbus)

6. SDI-12 #1 12. Spare

Dimensions 6.25” x 4” x 3.25” (W x H x D)

Connections Plug-in 3 way terminals Plug-in 6 way terminals

1. Earth/Shield 1. 9.6V to +30V DC

2. 4-20mA + (Hart+) Input 2. SDI-12

3. 4-20mA - (Hart-) Input 3. 0V DC

4. Extra SDI-12

5. 4-20mA+ Ouput

6. 4-20mA- Ouput

Operating Temperature -40°F to 176°F

Environmental IP65

Hydra-Pulse 275