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

2

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

3

Positive Displacement Flowmeter Model DOM

Maximum Flowrate Multiplier (for Higher Viscosities)

Viscosity

(cPs)

≤ 1,000 1 1

≤ 2,000 0.5 1

≤ 4,000 0.42 0.84

≤ 6,000 0.33 0.66

≤ 8,000 0.25 0.5

≤ 30,000 0.15 0.3

≤ 60,000 0.12 0.25

≤ 150,000 0.1 0.2

≤ 250,000 0.05 0.1

≤ 1,000,000 0.025 0.05

Standard

Rotor

Special Cut

Rotor

Special Cut Rotors for Higher Viscosities

For viscosity > 1000 cP, special cut rotors option "S" should
be used to reduce pressure drop. This applies to DOM-x15
and larger sizes. For higher viscosities, the flowmeter max.
flowrate is de-rated according to the table above. Example:
DOM-x25 measuring oil at 6000 cP, max. flow 40 GPM x

0.33 = 13.2 GPM new maximum flow rate.

Output Pulse Resolution

Model

Flow Range

(GPM)

Switch

DOM-x05.. 0.13...9.5 GPH 10,598 10,598 10,598

DOM-x10.. 0.5...27 GPH 3,975 3,975 3,975

DOM-x15.. 4...145 GPH 1,345 2,690 2,690

DOM-x20.. 0.26...10.6 318 636 636

DOM-x25.. 2.6...40 102 405 204

DOM-x30.. 4...66 53 212 106

DOM-x35.. 8...120 25 99 49

DOM-x40.. 9...150 18 73 36

DOM-x45.. 10...200 10 40.5 20

DOM-x50.. 13...260 5.68 22.7 11.36

DOM-x55.. 20...400 4.15 16.6 8.3

DOM-x60.. 40...660 2.1 8.5 4.24

Pulse per Gallon

Reed

Recommended Filter

DOM-x05 ... DOM-x15: 75 micron
DOM-x20 ... DOM-x35: 150 micron
DOM-x40 ... DOM-x60: 350 micron

Order Details Thread Connection (Example: DOM-A05G N8 2 H0 0)

Measuring

Range

0.13...9.5 GPH 1/8"

0.5...27 GPH 1/4"

4...145 GPH 3/8"

0.26...10.6 GPM 1/2"

2.6...40 GPM 1"

4...66 GPM 1-1/2"

8...120 GPM 2"

9...150 GPM 2"

10...200 GPM 3"

13...260 GPM 3"

20...400 GPM 4"

40...660 GPM 4"

* not for DOM-x05.., -x10.., -x15..; for DOM-x20.. to DOM-x60.., see M4 option description for details on minimum incremental volume unit per model number
** not available for DOM-x05.., -x10.., -x15.., -x20.., only available for DOM-A..
*** not available for DOM-x05.., -x10..

Fitting

(NPT)

AL/SS AL/PPS SS/SS SS/PPS

DOM-A05G

N1..

DOM-A10G

N2..

DOM-A15G

N3..

AL/AL

DOM-A20G

N4..

DOM-A25G

N6..

DOM-A30G

N8...

DOM-A35G

N9..

DOM-A40G

N9..

DOM-A45G

NB..

DOM-A50G

NB..

DOM-A55G

NC..

DOM-A60G

NC..

Housing/Gear Set Material

-

-

DOM-715G

N3..

DOM-720G

N4..

DOM-725G

N6..

DOM-730G

N8...

DOM-735G

N9..

- - -

DOM-745G

NB..

DOM-750G

NB..

DOM-755G

NC..

- - -

DOM-S05G

N1..

DOM-S10G

N2..

DOM-S15G

N3..

DOM-S20G

N4..

DOM-S25G

N6..

DOM-S30G

N8..

DOM-S35G

N9..

DOM-S45G

NB..

- -

- -

-

-

DOM-815G

N3..

DOM-820G

N4..

DOM-825G

N6..

DOM-830G

N8..

DOM-835G

N9..

DOM-845G

NB..

O-Ring

Material

..1.. = FKM

(standard)

..2.. = EPDM

..3.. = PTFE

coated FKM

..4.. = NBR

..1.. = FKM

(standard)

..2.. = EPDM

..4.. = NBR

Output
and/or

Display

..H0.. = Dual pulse,

reed and NPN

..R0.. = Pulse output
(reed switch)

..L0.. = 2-wire, 4-20mA

..D0.. = Quadrature

NPN

..Z1.. = Dual LCD
totalizer

..Z3.. = Dual LCD
totalizer/rate,
4-20mA

..Z4.. = ATEX Approved
Dual LCD
totalizer/rate,
4-20mA

..Z7.. = Dual LCD
totalizer/rate

..B1.. = Batcher

..M4*.. = 4-digit mech.

totalizer

Hall

Sensor

..0 = None

..A** = coupled with

air eliminator­ strainer ZAL

..S*** = special cut
rotors for
higher
viscosities

..C = Cooling fin for
LCD displays,
250°F Max

Quadr.

Hall Sensor

Options

4

www.koboldusa.com

No responsibility taken for errors;

subject to change without prior notice.

Positive Displacement Flowmeter Model DOM

Order Details Flange Connection (Example: DOM-A45G AB 2 H0 0)

Measuring

Range
[GPM]

0.26...10.6 1/2" 150lb

2.6...40

4...66 1.5" 150lb

8...120

9...150

10...200

13...260

20...400

40...660

Fitting

[ANSI]

1" 150lb DOM-A25G

2" 150lb DOM-A35G

2" 150lb DOM-A40G

3" 150lb DOM-A45G

3" 150lb DOM-A50G

4" 150lb DOM-A55G

4" 150lb DOM-A60G

AL/AL AL/PPS SS/SS SS/PPS

DOM-A20G

A4..

A6..

DOM-A30G

A8..

A9..

A9..

AB..

AB..

AC..

AC..

Housing/Gear Set Material

DOM-720G

A4..

DOM-725G

A6..

DOM-730G

A8..

DOM-735G

A9..

- - -

DOM-745G

AB..

DOM-750G

AB..

DOM-755G

AC..

- - -

DOM-S20G

A4..

DOM-S25G

A6..

DOM-S30G

A8..

DOM-S35G

A9..

DOM-S45G

AB..

- -

- -

DOM-820G

A4..

DOM-825G

A6..

DOM-830G

A8..

DOM-835G

A9..

DOM-845G

AB.

O-ring

Material

..1.. = FKM

(standard)

..2.. = EPDM

..3.. = PTFE

coated FKM

..4.. = NBR

..1.. = FKM

(standard)

..2.. = EPDM

..4.. = NBR

Output
and/or

Display

..H0.. = Dual pulse,

reed and NPN

..R0.. = Pulse output
(reed switch)

..L0.. = 2-wire, 4-20mA

..D0.. = Quadrature

NPN

..Z1.. = Dual LCD
totalizer

..Z3.. = Dual LCD
totalizer/rate,
4-20mA

..Z4.. = ATEX Approved
Dual LCD
totalizer/rate,
4-20mA

..Z7.. = Dual LCD
totalizer/rate

..B1.. = Batcher

..M4*.. = 4-digit mech.

totalizer

Options

..0 = None

..A** = coupled with air

eliminator­ strainer ZAL

..S = special cut
rotors for
higher
viscosities

..C = Cooling fin
for LCD displays,
250°F Max

* see M4 option description for details on minimum incremental volume unit per model number
** only available for DOM-A...
300lb Flanges are availabe for most models upon request

Order Details High Pressure (Example: DOM-H35G N9 2 H0 0)

Measuring

Range

0.13...9.5 GPH 1/8" DOM-H05G N1.. -

0.5...27 GPH 1/4" DOM-H10G N2.. -

4...145 GPH 1/4" DOM-H15G N2.. DOM-915G N2..

0.26...10.6 GPM

2.6...40 GPM

4...66 GPM

8...120 GPM

* only available for DOM-H15.. to DOM-H35...

Fitting

[NPT]

1/2"

1"

1 1/2"

2"

Housing/Gear Set Material

SS/SS SS/PPS

DOM-H20G N4.. DOM-920G N4..

DOM-H25G N6.. DOM-925G N6..

DOM-H30G N8.. DOM-930G N8..

DOM-H35G N9.. DOM-935G N9..

..1.. = FKM (standard)

..2.. = EPDM

..3.. = PTFE coated

FKM

..4.. = NBR

O-ring

Material

Output
and/or

Display

..H0.. = Dual pulse, reed and NPN

..R0.. = Pulse output (reed switch)

..L0.. = 2-wire, 4-20mA

..D0.. = Quadrature NPN

..Z1.. = Dual LCD totalizer

..Z3.. = Dual LCD totalizer/rate,

4-20mA

..Z4.. = ATEX Approved Dual LCD
totalizer/rate, 4-20mA

..Z7.. = Dual LCD totalizer/rate

..B1.. = Batcher

Options

..0 = None

..S* = special cut rotors

for higher
viscosities

..C = Cooling fin for
LCD displays,
250°F Max

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

www.koboldusa.com

5

Dimensions

DOM-x05...DOM-x15

DOM-x20...DOM-x40

Positive Displacement Flowmeter Model DOM

DOM-H05...DOM-H20

DOM-H25...DOM-H35

DOM-x45...DOM-x60

Model

DOM-x05.. - [2.67] - 3.62 [3.54] 4.45 [4.45] 4.80 [4.76] 4.92 [4.92] - 2.83 [2.91] 3.70 [3.70] 4.88 [4.88] 3.77 [3.77]

DOM-x10.. - [2.67] - 3.62 [3.54] 4.45 [4.45] 4.80 [4.76] 4.92 [4.92] - 2.83 [2.91] 3.70 [3.70] 4.88 [4.88] 3.77 [3.77]

DOM-x15.. - [3.74] - 3.89 [4.60] 4.72 [5.51] 5.08 [5.83] 5.19 [5.98] - 2.83 [3.94] 3.70 [3.94] 4.88 [4.88] 3.77 [3.94]

DOM-x20.. 4.33 [4.41] 7.44 4.17 [4.80] 5.70 [5.70] 6.06 [6.02] 6.18 [6.18] 7.00 [4.72] [4.72] [4.88] [4.72]

DOM-x25..

DOM-x30.. 7.4 [9.21] 9.92 6.10 [6.49] 7.67 [7.40] 7.99 [7.71] 8.15 [7.87] 8.94 [6.29] [6.29] [6.29] [6.29]

DOM-x35.. 8.34 10.8* (10.9) 6.69 [7.36] 8.27 [8.27] 8.58 [8.58] 8.74 [8.74] 9.33 [7.09] [7.09] [7.09] [7.09]

DOM-x40.. 8.34 10.8* 8.66 10.2 10.6 10.7 11.3 - - - -

DOM-x45.. 10.5 13.9 8.38 (8.11) 9.92 (9.80) 10.2 (10.1) 10.4 (10.2) 10.6 - - - -

DOM-x50.. 11.6 15.0 9.02 10.6 10.9 11.1 11.3 - - - -

DOM-x55.. 11.6 15.3 10.8 12.4 12.7 12.8 13.1 - - - -

DOM-x60.. 12.6 16.3 13.9 15.4 15.8 15.9 16.3 - - - -

A (inch) B (inch) C (inch)

Thread

Connection

5.39 (6.93)
[5.98]

Flange

Connection

7.79 (9.33) 4.72 [5.55] 6.29 [6.46] 6.61 [6.77] 6.77 [6.93] 7.40 [4.72] [4.72] [4.72] [4.72]

Cover ..Z1

..Z3/..Z4

..B1

..Z7 ..M4 Cover ..Z1

..Z3/..Z4

..B1

..Z7

Note: Dimensions for DOM-S... are specifi ed in ( ) only when they are different from DOM-A,
Dimensions of DOM-H... are specified in [ ].
* Dimensions for DIN flanges, 10.7" for ANSI flanges

6

www.koboldusa.com

No responsibility taken for errors;

subject to change without prior notice.

Positive Displacement Flowmeter Model DOM

Dimensions for DOM-A25… DOM-A40 with Option “A”

Dimensions for DOM-A45… DOM-A60 with Option “A”

Thread Connection (G or NPT)

Model

A B C D A B C D

DOM-A25 11.7 13.3 10.6 5.94 14.2 14.5 11.8 8.39

DOM-A30 11.3 15.7 11.5 5.55 14.2 17.0 14.3 8.39

DOM-A35 11.8 16.9 13.9 5.55 14.2* 18.1* 15.1* 8.39*

DOM-A40 11.8 16.9 13.9 5.55 14.2* 18.1* 15.1* 8.39*

DOM-A45 12.8 19.9 17.3 6.33 16.6 22.8 19.0 10.4

DOM-A50 12.8 21.1 18.4 6.33 16.6 23.9 20.1 10.4

DOM-A55 17.3 23.1 19.6 8.62 21.3 25.9 21.5 13.0

DOM-A60 17.3 24.1 20.7 8.62 21.3 27.0 22.5 13.0

* +0.04" for DIN flanges

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

(inch)

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Flanged Connection (DIN or ANSI)

(inch)

7

Positive Displacement Flowmeter Model DOM

Customer Name: __________________________________________

DOM Series Flowmeters Company Name: __________________________________________
Application Guide

Rev 09/2013 Phone: __________________________________________
FAX to:
KOBOLD Instruments Inc. Fax: __________________________________________
412-788-4890 (USA)
514-428-8899 (Canada) E-mail: __________________________________________

Design Conditions

Note:

1. Pressure: Maximum ____________ PSIG Accurate design pressure and temperature are essential to
ensure the flowmeter will be built to operate without damage.

2. Temperature: Maximum _________ °F Please fill out accurately and completely.

Process Conditions

1. Type of Liquid: ________________________________ 4. Desired Measuring Range: _______________GPM

2. Normal Operating Temperature: _______________°F 5. Maximum Liquid Viscosity: ___________________

3. Normal Operating Pressure:________________ PSIG 6. Line Size: ______________________

Body Material

Aluminum 316L SS Hi-Pressure 316L SS

O-ring Material

FKM (standard) EPDM PTFE coated FKM NBR

Rotor Material

Aluminum 316L SS PPS (not available on all models)

Fittings

NPT Thread 150LB Flange Other (Specify) _____________________________

Output/Display Options

H0 = Dual Pulse, Reed & NPN Z4 = LCD Ratemeter/Totalizer ATEX Approved

R0 = Reed Switch Z7 = LCD Dual Line Ratemeter/Totalizer

D0 = Quadrature NPN B1 = LCD Batch Controller

L0 = Signal Converter 4-20 mA 2-wire Output M3 = 4-digit Mechanical Totalizer (LPM)

Z1 = LCD Dual Line Totalizer M4 = 4-digit Mechanical Totalizer (GPM)

Z3 = LCD Ratemeter/Totalizer

Other Options

S = High-viscosity Rotors C = Cooling Fin for LCD Displays A = Coupled with Air Eliminator-
(not available on all models) (250 °F rating) strainer: Model ZAL

Special requirement, specify below: _____________________________________________________________________

____________________________________________________________________________________________________________

____________________________________________________________________________________________________________

8

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No responsibility taken for errors;

subject to change without prior notice.