Keller LevelRat Specifications

Lift Station LeveL tranSmitter

non-fouLing deSign for waStewater appLicationS

Specically designed for extended service in sewage lift station environments, the

LevelRat by Keller America features a wide sensing diaphragm yet small overall size. Unlike similar,

competing models which feature a fragile Teon®-coated rubber diaphragm, the LevelRat incorporates

a monolithic diaphragm which combines the non-stick quality of Teon with superior toughness and

abrasion resistance.

Perfectly suited for pump control applications, the LevelRat is compatible with any standard 2-wire, 4...20

mA current loop or 3-wire voltage systems.

Keller America’s guaranteed lightning protection makes this transmitter ideal for installation in areas

prone to chronic damage due to transients caused by lightning.

For more information on the LevelRat, or any other Keller product, please contact Keller America, or

view the entire Keller catalog at http://www.kelleramerica.com/datasheets.html.

FEATURES

4...20mA models include guaranteed lightning protection at no additional cost.

16-bit internal digital error correction for cost-effective low Total Error Band (TEB)3.

316L SS housing construction.

Non-fouling diaphragm for superior resistance to puncture.

2-year warranty covers defects in materials and workmanship.

User-rangeable analog output ensures compatibility as requirements change.

RS485 modied-MODBUS compatible interface allows up to 128 transmitters on a single bus.

Standard dual (analog & RS485) outputs simplify interface to controls, data collection, and telemetry systems.

Built in the U.S.A. ARRA Section 1605 Compliant.

Standard 3-day lead time.

LeveLrat

KELLER America Inc.

Newport News, Virginia

www.kelleramerica.com sales@kelleramerica.com

Output White Black Red Blue Yellow

2-wire

(mA)

3-wire

(VDC)

OUT /

GND

GND +VCC +OUT RS485A RS485B

Braided shield wire connected to transmitter housing

+Vcc N/A RS485A RS485B

Subject to alterations

Edition 11/2017

877-253-5537

 757-596-6659

Pressure Ranges

1,2

Relative Innite between 0...5 thru 0...100 ft W.C.

1. The LevelRat can be provided with custom calibration at no extra cost. For uids other than water, the specic gravity must be given at the time the order is placed.

2. Intermediate ranges are realized by deranging the analog output from the next highest basic range: 1, 3, and 10 bar (relative). Level range may be specied in units of lb/in2(psi), inches WC or feet WC. Keller America uses the International Standard conversion of 2.3067 feet WC/psi.

Accuracy

Static Standard ±0.2% FS

Total Error Band Standard ±0.5% BR

3. Static accuracy includes the combined effects of non-linearity, hysteresis, and non-repeatability at room temperature (25°C). Total Error Band (TEB) includes the combined effects of non-linearity, hysteresis, and non-repeatability as well as thermal dependencies, over the compensated temperature range, expressed as a percentage of the basic range (BR).

The calculation for maximum TEB on intermediate ranges (IR) is: TEB

= (BR/IR) X TEB

Electrical

Supply (4-20mA) 11...32 VDC

Supply (0-5VDC) 8...32 VDC

Supply (0-10VDC) 13...32 VDC

Load Resistance (mA) <(Supply-11V)/0.022A

Load Resistance (VDC) >4k ohm

6. Nominal values may be higher depending upon cable length. Internal lightning protection increases the minimum-required supply voltage from 8VDC to 11VDC, due to internal resistance of the surge protectors. In addition, cable resistance (~70Ω / 1000ft) adds to the supply requirement. In order to insure proper system operation, calculate the minimum required supply voltage (at the source) as follows:

For two-part (internal+external) system (recommended): MINIMUM SUPPLY VOLTAGE = 11.6 + 0.022 (CABLE LENGTH x 0.07) VDC

For internal only protector (standard with 4-20mA output): MINIMUM SUPPLY VOLTAGE = 11 + 0.022 (CABLE LENGTH x 0.07) VDC

Output

Current 4...20mA + RS485

Voltage 0...5, 0...10VDC + RS485

Resolution 0.002%

4. Other voltage output options available on request.

5. Resolution applies to digital output only. Analog resolution is continuous and limited by the process meter and not the instrument.

Environmental

Protection Rating IP68

Operating Temp. -10...60° C

Compensated Temp. 0...50° C

Wetted Materials 316 L Stainless Steel

Kynar

Fluorocarbon

Certications

CE EN50081-1, EN50082-2

Cable Options Polyethylene for general purpose

Hytrel for hydrocarbon

Tefzel for chemical interaction

Optional Accessories

1/2” NPT Conduit Fitting Drying Tube Assembly Bellows Assembly Cable Hanger Termination Enclosure Pressure Test Adapter

Stabilizing Weight Process Meter Signal Line Surge ProtectorInterface Converter