Kobold DON Temp

Oval Gear Flowmeter

for Low and High Viscosity Liquids

measuring

•

monitoring

•

analyzing

DON

●● Measuring Range:

0.13 … 9.5 GPH to 40 … 660 GPM

●● Viscosity Range: up to 1000 cP

(Higher upon Request)

●● Accuracy: ± 0.2% …1% of Reading

●● Material: Aluminum or Stainless Steel

●● p

: 1450 PSI; t

max

●● Pulse Output, LCD Display, 4…20 mA,

max

Alarms, Mechanical Totalizer

KOBOLD companies worldwide:

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

05/07-30-2019

: 300 °F

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

Oval Gear Flowmeter Model DON

Description

Oval gear flowmeters are categorized as positive displacement
flow technology. When liquid flows through this type of positive
displacement flowmeter, two oval geared rotors measure a constant
volume per rotation within a precisely machined measuring chamber.
With each rotation, a constant volume of liquid is measured. The
rotation of the oval gears is sensed via magnets embedded within
the rotors. These magnets transmit a high resolution pulse output.
The output signal can be processed externally via a remote display
controller or PLC or via a variety of output/display options available
as accessories attached to the flowmeters.

Operation:
Liquid travels around
the crescent shaped
chambers created by
the rotational movement
of the rotors

Liquid in transit

Flow

Liquid entering the
measuring chamber

The positive displacement flow technology allows for precise flow
measurement of most clean liquids regardless of the media's
conductivity. Other liquid properties also have a minimal effect on
the performance of this type of meter. Flow profile conditioning is
not required, as with alternative flow technology options, making
oval gear installations simple to install in tight spaces and at a
economical price.

Areas of Application

Suitable for viscous, non abrasive, clean liquids like:



Petroleum



Grease



Pastes

●
●

Oil
Fuels

●
●

Aluminum body meters are compatible with fuels, fuel oils, & other
lubricating liquids. In addition to lubricating media, stainless steel
flowmeters are suitable for most products and chemicals.

Technical Data

Materials

DON-1
Body: Aluminum
Gears: PPS GF 30 / PTFE
Axles: 316L Stainless Steel

DON-2
Body

DON-x05 ... DON-x15: 316L Stainless Steel
(DON-205 Body Cover is 316LN SS)
DON-x20 ... DON-x60: 316L/301* Stainless Steel

2

Liquid exits
the measuring
chamber

Chemicals
Ink

www.koboldusa.com

Gears
DON-x05 ... DON-x40: 316L Stainless Steel
DON-x45 ... DON-x60: 301* Stainless Steel
Bearing: Carbon Graphite

Axles: 316L Stainless Steel
DON-8

Body
DON-x05 ... DON-x15: 316L Stainless Steel
(DON-805 Body Cover is 316LN SS)
DON-x20 ... DON-x60: 316L/301* Stainless Steel

Gears: PPS GF 30 / PTFE
Axles: 316L Stainless Steel

O-Rings (Media Temperature Limits)
FKM: -4 ... 300 °F

NBR: -4 ... 212 °F
FEP-Clad EPDM: 5... 266 °F

Electrical Cover (for Cable Connection)
Standard: Polyamide PA6 GF35 UL94 HB/VO
Optional: 316L Stainless Steel

Cable Entry: M 20 x 1.5 or ½" NPT Adapter
Screw Material
for Aluminum Housing: Stainless Steel (Standard)

Steel Coated with GEOMET® 321
(for DON-225 and DON-825)

for Stainless Steel
Housing: Stainless Steel (Standard)

Steel Coated with GEOMET®321
(optional) for Higher Pressure Rating
(See Order Details)

Accuracy**
DON-x05...DON-x15: ± 1% of Reading
DON-x20...DON-x60
SS Rotors: ± 0.5% of Reading; ± 0.2% of Reading

with Optional Z3/E3 Electronics with
Linearization Function

PPS Rotors: ± 1% of Reading; ± 0.5% of Reading
with Optional Z3/E3 Electronics with
Linearization Function

Option M4: ± 1% of Reading

Additional Inaccuracy
for Analog Outputs: ± 0.15% of Full Scale

(Better Accuracies for Higher Viscosities Available upon Request)

Repeatability: ± 0.03 % Typical
Protection Class: IP 66/67 (IP 65 for M4)
Media Temperature

Options ..Lx, ..Zx, ..M4: -4...176 °F
DON-1/DON-8 Max: 176 °F (PPS Rotors)

Pulse Out or Option ..Zx
with Cooling Fins: -4...250 °F
Option ..T0: -4...300 °F
Ambient Temperature -4 ... 176 °F,

Option M4: 32...140 °F
Cable Entry: M20 x 1.5 or 1/2" NPT Adapter

* Closest AISI Equivalent to 1.3955 Stainless Steel
** Reference Conditions: DON-x05...x20 (Mineral Oil, 10 cSt, 68 °F, 75 PSIG)
DON-x25...x60 (Mineral Oil, 3 cSt, 68 °F, 14 PSIG)
Accuracy data is valid for given viscosities and higher

No responsibility taken for errors;

subject to change without prior notice.

Oval Gear Flowmeter Model DON

ATEX-Approval
(Options E1/E2/E3/E4/E5): II 2G Ex ia IIC T4 Gb (-20 °C ≤ Ta ≤ +60 °C)
(Options HE, DE, BE,
KE, GE, LE, RE): II 2G Ex db IIC T4/T6 Gb

I M2 Ex db I Mb

IECEx-Approval
(Options E1/E2/E3/E4/E5): Ex ia llC T4 Gb
(Options HE, DE, BE, KE,
GE, LE, RE): Ex db llC, Ex db l Mb

Maximum Pressure (Threaded Models)

Maximum Pressure (PSI)

Model

DON-x05

DON-x06 - -

DON-x10 - -

DON-x15 - -

DON-x20 1000*

DON-x30

DON-x35 435

DON-x40

DON-x45

DON-x50

DON-x55

DON-x60

With flanges: Maximum pressure rating as above or as per flange rating,
whichever is lower.

* Max pressure of 1450 psi possible with steel screws (see order details)

DON-1

925

580 725

230 230 230 230

DON-

2/8

1450

DON-1 (Op-

tion-M4)

- -

580

DON-2/8

(Option–M4)

580DON-x25 870*

Output Types

Reed Switch Pulse Output (.. R0 / RE)

The reed switch output is a two wire, normally open, SPST, voltage
free contact ideal for installations without power or for use in
hazardous area locations where Intrinsically Safe (I.S.) is required.

Note: when using the reed switch output, the liquid temperature must
not change at a rate greater than 18 °F per minute.

Average switching life of reed contact (MTTF):
Max. Load (100 V / 10 mA) 5 x 105 switching cycles

Min. Load (<5 V / 10 mA) 5 x 108 switching cycles
Power supply: max. 30 VDC, max. 200 mA

Hall Sensor Pulse Output (.. H0/HE)

In the electronics options H0/HE, a Hall Effect sensor is combined
with an active push-pull output. The signal output is actively switched
either to +Vs or to ground. No additional external circuit is required
(e.g. pull-up resistor). The "high" signal is approximately equal to the
supply voltage +Vs and the "low" signal is approximately 0 V. The
electronic utilizes a 3-wire connection with an external supply voltage
of 8 ... 30 VDC. The electrical load may be optionally connected to
the supply voltage or to GND. Maximum output current (current
source or sink): 100 mA (short circuit protected). In addition to the
Hall sensor, this option is equipped with a Reed switch which works
the same as option R0/RE.

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

www.koboldusa.com

Hall Sensor Pulse Output (.. HU)

Like option H0, except an NPN output in place of the
push-pull output and a supply voltage of 5-30 V

DC.

Hall Sensor Pulse Output, (.. B0/BE)

Like options H0/HE; however with bipolar sensors and
alternating polarized magnets. This option is used for
pulsating flow, but is not equipped with a Reed switch and
has half the k-factor value as compared to H0/HE.

High-Resolution Hall Sensor Pulse Output, (..G0/GE,
..K0/KE)

Like options H0/HE; the models DON-x05 and DON-x10 can
be supplied with four times the pulse count per volume unit
and models DON-x05...x20 with double the amount of pulses
(K0/KE) (see table «Output Pulse Resolution» on the following
pages).

Quadrature Hall Effect Pulse Output (..D0/DE)

The DON with option D0/DE provides two independent Hall
sensors. They are arranged to give separate outputs out of
phase with one another.
The QUAD output is mostly suitable for detecting bidirectional
flows (detection of flow direction) or where a redundant signal
is desirable. Maximum output current per channel (current
source or sink): 100 mA (short circuit protected).

Analog Output (..L0/LE)

The options L0 and LE (Ex) are available with a loop-powered
4-20 mA output. The loop must be powered with an external,

16...32 VDC power supply. The maximum resistance of the
series loads (PLC analog input / display electronics) depends
on the magnitude of the supply voltage and can be calculated
as follows:
Max. load [Ohm] = (+Vs – 9 VDC) / 0.02 A [Ω]
Example: +Vs = 32 VDC = > max. load = 1150 Ω

+Vs = 16 VDC => max. load = 350 Ω
The load can be inserted at any point in the current loop,
observing correct polarity.

Mechanical Totalizer (..M4)

The DON-x20 .. through DON-x60 .. are available 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. Option M4 is also optionally available
in liters.

Body Material: Enameled Die-cast Aluminum,
Powder-coated
Protection: IP 65

Ambient Temp: 32...140 °F
Media Temp: -4...176 °F

Recommended Filtration Requirements:

DON-x05 ... DON-x15 < 75 μm (200 mesh)
DON-x20 ... DON-x35 < 150 μm (100 mesh)
DON-x40 ... DON-x60 < 350 μm (45 mesh)

3