Hytek HO Series Instruction manual

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Technical Data
HO Range of Flow Meters
Applies to the following models only:
- HO 25 A MM - HO 40 A MM - HO 50 A MM
- HO 25 A ME - HO 40 A ME - HO 50 A ME
- HO 25 A PM - HO 40 A PM - HO 50 A PM
- HO 25 S MM - HO 25 S ME - HO 25 S PM
Please read carefully before commencing installation
Registered Office: HYTEK (GB) LIMITED, Delta House, Green Street, Elsenham, Bishop’s Stortford
CM22 6DS UK. Registered in England No. 1915382
Tel: [phone] Fax: [phone] email: [e-mail]
Web: www.hytekgb.com
HO 25 A MM HO 40 A ME
HO 25 A PM

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ENVIRONMENTAL INFORMATION
European Directive 2012/19/EU requires that the
equipment bearing this symbol on the product and/or its
packaging must not be disposed of with unsorted
municipal waste. The symbol indicates that this product
must be disposed of separately from regular household
waste streams. It is your responsibility to dispose of this
and other electric and electronic equipment via
designated collection facilities appointed by the
government or local authorities.
IMPORTANT WARNING NOTES
1. This meter is only be used to measure diesel or liquids classed as cat. 3
in accordance with European Regulation No. 1272/2008. It must not be
used to measure petrol or any other liquid with a similar flash point.
2. This product must not be used if it is damaged or leaking, located in a
fully enclosed environment or not provided with adequate ventilation.
3. Installation of this equipment and its associated tank, pipe work and
fittings should only be carried out by qualified fuel installation engineers
and must conform to the latest relevant electrical and local authority
regulations and standards.

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Meter Code Description Body
Material
Seal
Material
Flow Rate
/ L/min Accuracy
Max.
Pressure
/ PSI (bar)
Port Size
Register/
Total
Pulse
Output
HO25AMM 1" Mechanical
Meter Aluminium Viton 20-200 +/-0.5% 485 (34) 1" F BSPP
4 digit/
6 digit N/A
HO40AMM 1 1/2" Mechanical
Meter Aluminium Viton 23-250 +/-0.5% 257 (18)
1 1/2"
F BSPP
4 digit/
6 digit N/A
HO50AMM 2" Mechanical
Meter Aluminium Viton 30-300 +/-0.5% 257 (18) 2" F BSPP
4 digit/
6 digit N/A
HO25AME 1" Electronic
Meter Aluminium Viton 20-200 +/-0.25% 485 (34) 1" F BSPP
5 digit/
7 digit N/A
HO40AME 1 1/2" Electronic
Meter Aluminium Viton 23-250 +/-0.25% 257 (18)
1 1/2"
F BSPP
5 digit/
7 digit N/A
HO50AME 2" Electronic
Meter Aluminium Viton 30-300 +/-0.25% 257 (18) 2" F BSPP
5 digit/
7 digit N/A
HO25APM 1" Pulse Meter Aluminium Viton 20-200 +/-0.5% 485 (34) 1" F BSPP N/A Reed
83.3P/L
HO40APM 1 1/2" Pulse
Meter Aluminium Viton 23-250 +/-0.5% 257 (18)
1 1/2"
F BSPP N/A Reed 32.5P/L
HO50APM 2" Pulse Meter Aluminium Viton 30-300 +/-0.5% 257 (18) 2" F BSPP N/A Reed
16P/L
HO25SMM 1" Mechanical
Meter
Stainless
Steel Viton 20-200 +/-0.5% 485 (34) 1" F BSPP
4 digit/
6 digit N/A
HO25SME 1" Electronic
Meter
Stainless
Steel Viton 20-200 +/-0.5% 485 (34) 1" F BSPP
5 digit/
7 digit N/A
HO25SPM 1" Pulse Meter Stainless
Steel Viton 20-200 +/-0.5% 485 (34) 1" F BSPP N/A Reed 83.3P/L
PRODUCT SPECIFICATION
• Only suitable for use with diesel, gas oil or biodiesel up to B30.
• Maximum viscosity 1000cPs
• Operating temperature -25°C to +55°C
INSTALLATION INSTRUCTIONS
1. Prior to meter installation the entire piping system must be cleaned to
prevent damage to the meter as a result of contamination.
2. Install the meter so that the arrow on the side of the meter points in the
direction of flow.
3. Install a suitable strainer (60 mesh or finer) upstream of the meter.
4. Install the meter so that the dial face is facing forward with the counter
reading horizontally. See diagram below.

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5. When filling the fuel line, introduce the liquid slowly so as not to force air
through the meter at high rate.
6. The HO25/40/50APM and HO25SPM have a twin passive, reed switch
pulse outputs rated at 5-36V, 15mA max with a 90° signal phase shift.
One reed switch is connected across the red and yellow wires with the
other connected across the blue and black wires.
OPERATING INSTRUCTIONS
HO25/40/50AME & HO25SME
1. Activate the display - Prior to running fuel through the meter press the
ON/CLEAN button to activate the display. If no fuel is drawn for one
minute the display will de-active.
2. Reset display - With the display activated press the ON/CLEAN button
again to reset the main volume display.
3. Batch Total – This is shown at the bottom of the display in the normal
operation mode. To reset the batch total press the TOTAL button twice
,so that the batch total is flashing, followed by the ON/CLEAN button.
4. Totalizer - To view the ongoing (non-resettable) totalizer press the
TOTAL button. Press the ON/CLEAN button to return to the previous
normal operation mode with the batch total showing.
5. Calibration – The calibration mode is accessed by pressing the SETUP
button. The calibration factor and the units of measure are then
displayed with the calibration factor which can be adjusted by pressing
the SETUP button until the digit to be changed is flashes. This digit can
then be increased by pressing the ON/CLEAN button and decreased by
pressing the TOTAL button. Each single unit of increase or decrease in
the calibration factor equates to a percentage of liquid volume
adjustment. For the HO25AME the percentage is 0.07%, for the
HO40AME 0.03% and for the HO50AME 0.01%. An increase of one unit
will result in a decrease of 0.07%/0.03%/0.01% in the volume of liquid
dispensed for the volume displayed on the meter and a decrease will
have the opposite effect so if, during a measure check, the display of a
HO25AME shows 20 litres and the volume in the test measure is 20.1
litres increase the calibration factor by 7 to bring the accuracy to within
0.05%. Once the calibration factor has been set and no more buttons
are pressed the meter will return to the normal operation mode after 3
seconds and retain the changes made.
6. Unit of measure – This can be changed by accessing the calibration

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mode and then repeatedly pressing the SETUP button, to scroll though
the calibration factor changing routine, until the unit of measure is
displayed on the next screen. Change the unit of measure by pressing
the ON/CLEAN or TOTAL button. Once the unit of measure has been
set and no more buttons are pressed the meter will return to the normal
operation mode after 3 seconds and retain the changes made.
HO25/40/50AMM & HO25SMM
1. Resettable totalizer – To reset the lower, resettable totalizer press the
reset button.
2. Calibration – The calibration of these meters is factory set and cannot be
adjusted.

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TROUBLESHOOTING
Fault Cause Remedy
Fluid will not flow
through meter
a) Foreign matter blocking
rotors
b) Line strainer blocked
c) Damaged rotors
d) Meter connections over
tightened
e) Fluid is too viscous
Dismantle meter and clean
rotors
Clean strainer
Replace rotors
Re-adjust connections
See specifications for
maximum viscosity
Reduced flow
through meter
a) Strainer is partially blocked
b) Fluid is too viscous
Clean strainer
See specifications for
maximum viscosity
Meter reading
inaccurate
a) Fluid rate is too high or too
low
b) Fluid is too viscous
c) Excess wear caused by
incorrect installation
See specifications for
minimum and maximum
flow rates
Bleed air from system
Check meter body and
rotors. Replace as
required. Refer to
installation instructions.
Fluid flows but no
reading on meter
a) Bevel gear is loose on
shaft
b) Rotor drive gear is
damaged
c) Transmission gears
damaged
d) Register gears damaged
Tighten grub screws
Replace rotors
Replace gears
Replace register assembly
Fluid leaks into
register
a) Cover plate seal worn or
damaged
Replace seal (check seal
compatibility with fluid)

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COMPONENTS HO25 40 50AMM & HO25SMM
No. Description Qty. No. Description Qty.
1 Measuring Assy. 1 7 Rotor (Oval Gear) 1 1
2 Upper Cover Gland 1 8 Rotor (Oval Gear)
Shaft
1
3 O-ring (Viton) 1 9 Rotor (Oval Gear)
Shaft - Short
1
4 Upper Cover 1 10 Rotor (Oval Gear) 2 1
5 O-ring (Viton) 1 11 Bolt 4
6 Meter Body 1

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E.U. DECLARATION OF CONFORMITY
Company Name: Hytek (GB) Ltd
Address: Delta House, Green Street
Elsenham, Bishops Stortford
Hertfordshire
CM22 6DS, UK
Date of Issue: 9
th
June 2016
Equipment Details: HO Range of Meters and Components
HO25/40/50AMM, HO25/40/50AME,
HO25/40/50APM, HO25SME, HO25SPM
Applicable Directives: 2004/108/EC EMC Directive &
& Standards 2014/30/EU EMC Directive
(effective date 20
th
April 2016)
EN 61000-6-3:2007 (+A1)
Electromagnetic compatibility (EMC) - Part 6-3:
Generic standards - Emission standard for residential,
commercial and light-industrial environments
EN 61000-6-2:2005
Electromagnetic compatibility (EMC) Part 6-2:
Generic standards - Immunity for industrial environments
2006/42/EC Machinery Directive
97/23/EC Pressure Equipment Directive &
2014/68/EU Pressure Equipment Directive
(effective date 19
th
July 2016)
2012/19/EU Waste Electrical & Electronic Equipment
Regulations
2011/65/EU Restriction of Hazardous Substances
Directive (RoHS2)
Declaration Number: EU129
On behalf of the above named company, I declare under our sole responsibility that,
on the date the equipment accompanied by this declaration is placed on the market,
the equipment conforms with all technical and regulatory requirements of the above
listed directives.
Clive Wellings
Technical Manager
THE INFORMATION CONTAINED IN THIS DOCUMENT IS PROTECTED BY COPYRIGHT © AND PROPERTY LAWS
AND IS THE SOLE PROPERTY OF HYTEK (GB) LTD. ANY REPRODUCTION IN PART OR AS A WHOLE WITHOUT
THE WRITTEN PERMISSION OF HYTEK (GB) LTD IS PROHIBITED.