Keller Microlevel Specifications

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Micro-bore SubMerSible level TranSMiTTer

high accuracy 0.63” oD level TranSMiTTer

The Microlevel by Keller America is the smallest diameter, media isolated submersible level transmitter

in its class. At only 0.63”, it is specically designed for applications that demand small size and high

performance.

The Microlevel combines proven piezoresistive silicon sensor technology with Keller’s state-of-the-art

signal conditioning circuitry to provide outstanding ±0.25% FS Total Error Band (TEB)3 accuracy over a

wide compensated temperature range.

Combined with Keller America’s guaranteed lightning protection, the Microlevel is the ideal solution for

ground water level measurement and environmental monitoring applications, especially areas prone to

chronic damage due to transients caused by lightning.

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

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

FEATURES

Class-leading 0.63” outside diameter

Guaranteed lightning protection included at no additional cost

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

316L stainless steel construction

2-year warranty covers defects in materials and workmanship.

Microlevel

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.

KELLER America Inc.

Newport News, Virginia

www.kelleramerica.com sales@kelleramerica.com

Output White Black Blue Yellow

2-wire

(mA)

Braided shield wire connected to transmitter housing

Min. pipe bend radius 1” IPS 1.5” IPS 2” IPS

Schedule 40 18” 5” 3”

Schedule 80 22” 6” 4”

OUT /

GND

+Vcc RS485A RS485B

Edition 07/2019

Subject to alterations

877-253-5537

 757-596-6659

Pressure Ranges

1,2

Relative Innite between 0...3 thru 0...900 ft W.C.

1.The Microlevel 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, 10, and 30 bar. 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.

Electrical

Supply (4-20mA) 10...30 VDC

Load Resistance (mA) <(Supply-10V)/0.022A

5. Nominal values may be higher depending upon cable length. 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:

MINIMUM SUPPLY VOLTAGE = 10 + 0.022 (CABLE LENGTH x 0.07) VDC

Accuracy

Static ±0.1% FS

Total Error Band ±0.25% 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:

TEBIR = (BR/IR) X TEB

Output

Current 4...20mA + RS485

Resolution

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

0.002%

Optional Accessories

Environmental

Protection Rating IP68

Operating Temp. -10...60° C

Compensated Temp. 0...50° C

Wetted Materials 316 L Stainless Steel

Polyamide

Fluorocarbon

Cable Options Polyethylene for general purpose

Hytrel for hydrocarbon

Tefzel for chemical interaction

Certications

CE EN50081-1, EN50082-2

Drying Tube Assembly Bellows Assembly Cable Hanger Termination Enclosure

Pressure Test AdapterInterface Converter Process Meter Signal Line Surge Protector