Kobold DOM Specifications

Positive Displacement

Flowmeter

measuring

•

monitoring

•

analyzing

DOM

● Threaded, Flanged, and High Pressure

Series

● Aluminum or Stainless Steel Bodies

● Measures Liquids with Viscosities to

1,000 cPs (Higher with Special Cut Rotors)

● Operating Pressures to 5,800 PSIG

● Electronics Packages Include Analog and
Frequency Outputs, Mechanical or LCD
Totalizers, and Batch Controllers

● Bi-directional Flow Capability and Optional
Quadrature Output

KOBOLD companies worldwide:

ARGENTINA, AUSTRIA, BELGIUM, BULGARIA, CANADA, CHILE, CHINA, COLOMBIA, CZECH REPUBLIC,
EGYPT, FRANCE, GERMANY, GREAT BRITAIN, HUNGARY, INDIA, INDONESIA, ITALY, MALAYSIA, MEXICO,
NETHERLANDS, PERU, POLAND, ROMANIA, SINGAPORE, SOUTH KOREA, SPAIN, SWITZERLAND, TAIWAN,
THAILAND, TUNISIA, TURKEY, USA, VIETNAM

01/03- 2014

KOBOLD Instruments, Inc.
1801 Parkway View Drive
Pittsburgh, PA 15205

Main Ofce:

1.800.998.1020

1.412.788.4890
[e-mail]
www.koboldusa.com

Positive Displacement Flowmeter Model DOM

Description

The DOM series positive displacement flowmeter is the
preferred choice for measuring viscous liquids such as
lubricating/hydraulic oils, diesel fuels, chemicals, solvents,
resins, and pastes.

The Oval Gear meters are positive displacement
flowmeters where the passage of liquid causes two oval
gears to rotate within a precision measuring chamber and
with each rotation a fixed volume of liquid passes through
the meter. Magnets embedded within the gears initiate a
high resolution pulse train output. The pulse output can be
wired directly to process control and monitoring equipment
or can be used as an input to instruments supplied with or
fitted directly onto the meter.

The flowmeter is available as a blind transmitter with
pulse or 4-20mA output capable of interfacing to most
monitoring and control instrumentation or the meter can be
fitted with or supplied with instruments such as totalizers,
rate totalizers or batch controllers. These instruments also
have monitoring and control output options including 4-20
mA, scaled pulse, flowrate alarms and batch control logic
(preset metering).

This technology allows precise flow measurement and
dispensing of most clean liquids regardless of their
conductivity, with other liquid characteristics having no
or minimal effect on meter performance. This metering
technology does not require flow profile conditioning
or straightline runs as required with alternative flow
technologies making the installation relatively compact and
low cost.

Positive displacement flowmeters are an inexpensive
means to accurately meter high viscosity clean liquids as
high as 1 million centipoise. The appropriate meter must be
sized to accomodate the pressure drop across the primary
measuring elements (oval rotors) and to not exceed the
maximum pressure capability of the meter.

Specifications

Wetted Material
DOM-A05..DOM-A15
Body: Aluminum
Gear/Bearing: Sintered 316 Stainless Steel/
Carbon Ceramic or PPS/No
Bearing*
DOM-A20..DOM-A60
Body: Aluminum
Gear/Bearing: Aluminum/Hardened Steel
Rollers (Lubricating Fuels and
Oils only) or PPS/No Bearing*

Specifications

DOM-S, DOM-H

Body: 316L Stainless Steel
Gear/Bearing: Sintered 316 SS/Carbon Ceramic
or PPS/No Bearing*
O-Rings: FKM (Standard): 5...250 °F;
EPDM (Ethylene Propylene Rubber):

-4...250 °F (for Ketones only);
PTFE Encapsulated FKM: -4...250 °F;
NBR: -4...210 °F
Cover: Glass Reinforced Polyamide
Accuracy
DOM-x05...DOM-x15: ±1.0% of Reading
DOM-x20...DOM-x35: ±0.5% of Reading
DOM-x40...DOM-x60: ±0.2% of Reading
Repeatability: ±0.03% of Reading
Protection: NEMA 4X/IP66
Temperature Range
Options Z, B, L0, M4: -4...176 °F
Pulse Output: -4...250 °F
Electrical Connection: 1/2" NPT

*PPS Rotors not available on some models

Maximum Pressure

Max. Pressure (PSI)

Standard Threaded - Pulse Output* Aluminum Stainless

DOM-x05.. - DOM-x15.. 220 495

DOM-x20.. - DOM-x25.. 990 990

DOM-x30.. 435 435

DOM-x35.. 285 550

DOM-A40.. 285 x

DOM-x45.. 175 175

DOM-A50.. 175 x

DOM-A55.. - DOM-A60.. 145 x

150lb ANSI Flanged - Pulse Output* Aluminum Stainless

DOM-x20.. - DOM-x45.. 175 175

DOM-A50.. 175 x

DOM-A55.. - DOM-A60.. 145 x

Mechanical Meter - Option ..M4 Aluminum Stainless

DOM-x20..M4 - DOM-x25..M4 580 580

DOM-x30..M4 435 435

DOM-x35..M4 - DOM-x40...M4 285 285

DOM-x45..M4 175 175

DOM-A50..M4 175 x

DOM-A55..M4 - DOM-A60..M4 145 x

High Pressure Threaded - Pulse Output* Aluminum Stainless

DOM-H05.. - DOM-H30.. x 5800

DOM-H35.. x 4350

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www.koboldusa.com

No responsibility taken for errors;

subject to change without prior notice.

Positive Displacement Flowmeter Model DOM

Pulse Output

Reed/Hall Effect Sensor Pulse Output (..H0)

The Hall Effect sensor is a high resolution solid state 3
wire device providing an unsourced, open collector, NPN
transistor output. The term “un-sourced” means that no
voltage is applied to the output from within the flowmeter,
it must be pulled to a “high” or “on” state by between
5 - 24 VDC supplied from an external source, typically the
receiving instrument.
The pulse output between signal and -0 V is a voltage
square wave with the high level being the DC voltage
available at the open collector and the low level being

-0 V.
The receiving instrument must incorporate a pull up
resistor (typically greater than 10 kΩ in most instruments)
which ties the open collector to the available DC voltage
level when the Hall sensor is not energized. When
energized the open collector output is pulled to ground
through the emitter (-0 V).
For the Reed Switch technical description, see the R0
details below.

Hall Effect Power Supply: max. 5-24 VDC, max. 20 mA

Dual Reed Switch Pulse Output (..R0)

The dual reed switch output are two wire normally open
SPST voltage free contacts ideal for installations without
power or for use in hazardous area locations when
Intrinsically Safe (I.S.) philosophy is adopted.
Note: When using the reed switch output the liquid
temperature must not change at a rate greater than 50
ºF per minute. In general the reed switch life will exceed 2
billion actuations when switching less than 5 VDC/10 mA.

Power Supply: max. 30 VDC, max. 200 mA

Quadrature Hall Effect Pulse Output (..D0)

Two Hall Effect sensors arranged to give separate outputs
90° out of phase with one another. The quadrature output
is typically suited to custody transfer applications where
signal integrity verification is required, it is also used for
metering bi-directional flow.

Power Supply: max. 8 - 24 VDC, max. 20 mA

Mechanical Totalizer (..M4)

The flowmeters type DOM-x20.. up to DOM-x60.. are
available with a mechanical totalizer with a 4-digit
resettable totalizer and indication of accumulated total
value. The motion of the rotors is transmitted to the
mechanical register totalizer via an interfacing reduction
gear train and dynamic seal assembly. For models
DOM-x20.. & DOM-x25.. the resettable totalizer and
accumulated totalizer read in x1 gallons. For models
DOM-x30.. to DOM-x60.. the resettable totalizer and
accumulated totalizer read in x10 gallons.

Signal Converter (..L0)

The L0 signal converter option may be set to function as either a
frequency to current converter (2-wire 4-20mA output), a pulse
divider, or a single point flow rate alarm. The signal board also has
an NPN pulse output which mirrors the input pulse frequency, this
signal may be used for remote rate and/or total indication.
Power Supply: 24 V

DC

ATEX - Approval (..Z4)

II 2G EEx ia IIB T4 (-4°F < Ta < 140°F)

Electronic with LCD Display

Type ..Z1 ..Z3/..Z4 ..Z7 ..B1

Function Dual

Power Source

Battery-powered yes yes yes no

External (Drives

Output, Backlighting)

LCD Display

-Line 1/no. of Digits 7.5 mm/5 9 mm/8 17 mm/6 9 mm/6

-Line 2/no. of Digits 3.6 mm/8 - 7 mm/8 -

Selectable Units yes yes yes yes

Decimal Point yes yes yes yes

Subscripts Displayed yes yes yes yes

Accumulative Total yes yes yes yes

Resettable Total yes yes yes no

Linearization no yes no no

Rate Display no yes yes no

Backlighting no no yes no

Input Type

Un-powered Sensors see ZOD datasheet

Powered Sensors see ZOD datasheet

Outputs

4-20 mA (750 Ω) no yes no no

High/Low Flow Alarm no NPN/PNP no no

Batch End & Control no no no NPN/PNP

Pulse Outputs NPN/PNP NPN/PNP NPN NPN/PNP

2 x SPDT Relays no optional no optional

Installation

NEMA 4X/IP66 yes yes yes yes

Cable Entries 2 x gland 3 x M20 3 x M16 3 x M20

Intrinsic Safe (Option) yes yes no no

Mounting meter mount, pipe, wall, or panel mounting

Temperature Range -4...176 °F (Option: -4...250 °F)

Totalizer

8-24 V

Rate

Totalizer

8-24 VDC8-24 VDC12-24 V

DC

Rate

Totalizer

Batch

Controller

DC

No responsibility taken for errors;
subject to change without prior notice.

www.koboldusa.com

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