Hydronic Manometers
Hydronic Manometer
Model HM670
Owner’s Manual
LIMITATION OF WARRANTY AND LIABILITY
Copyright©
TSI Incorporated / 2007-2008 / All rights reserved.
Address
TSI Incorporated / Alnor Products / 500 Cardigan Road / Shoreview, MN 55126 / USA
Telephone No. Fax No
651 490-2811 / 800 874 2811 (651) 490-3824
LIMITATION OF WARRANTY AND LIABILITY (effective July 2000)
Seller warrants the goods sold hereunder, under normal use and service as described in the operator's
manual, shall be free from defects in workmanship and material for twenty-four (24) months, or the length
of time specified in the operator's manual, from the date of shipment to the customer. This warranty
period is inclusive of any statutory warranty. This limited warranty is subject to the following exclusions:
a. Hot-wire or hot-film sensors used with research anemometers, and certain other components when
indicated in specifications, are warranted for 90 days from the date of shipment.
b. Parts repaired or replaced as a result of repair services are warranted to be free from defects in
workmanship and material, under normal use, for 90 days from the date of shipment.
c. Seller does not provide any warranty on finished goods manufactured by others or on any fuses,
batteries or other consumable materials. Only the original manufacturer's warranty applies.
d. Unless specifically authorized in a separate writing by Seller, Seller makes no warranty with respect
to, and shall have no liability in connection with, goods which are incorporated into other products or
equipment, or which are modified by any person other than Seller.
The foregoing is IN LIEU OF all other warranties and is subject to the LIMITATIONS stated herein. NO
OTHER EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR PARTICULAR PURPOSE OR
MERCHANTABILITY IS MADE.
TO THE EXTENT PERMITTED BY LAW, THE EXCLUSIVE REMEDY OF THE USER OR BUYER, AND
THE LIMIT OF SELLER'S LIABILITY FOR ANY AND ALL LOSSES, INJURIES, OR DAMAGES
CONCERNING THE GOODS (INCLUDING CLAIMS BASED ON CONTRACT, NEGLIGENCE, TORT,
STRICT LIABILITY OR OTHERWISE) SHALL BE THE RETURN OF GOODS TO SELLER AND THE
REFUND OF THE PURCHASE PRICE, OR, AT THE OPTION OF SELLER, THE REPAIR OR
REPLACEMENT OF THE GOODS. IN NO EVENT SHALL SELLER BE LIABLE FOR ANY SPECIAL,
CONSEQUENTIAL OR INCIDENTAL DAMAGES. SELLER SHALL NOT BE RESPONSIBLE FOR
INSTALLATION, DISMANTLING OR REINSTALLATION COSTS OR CHARGES. No Action, regardless
of form, may be brought against Seller more than 12 months after a cause of action has accrued. The
goods returned under warranty to Seller's factory shall be at Buyer's risk of loss, and will be returned, if at
all, at Seller's risk of loss.
Buyer and all users are deemed to have accepted this LIMITATION OF WARRANTY AND LIABILITY,
which contains the complete and exclusive limited warranty of Seller. This LIMITATION OF WARRANTY
AND LIABILITY may not be amended, modified or its terms waived, except by writing signed by an Officer
of Seller.
Service Policy
Knowing that inoperative or defective instruments are as detrimental to TSI as they are to our customers,
our service policy is designed to give prompt attention to any problems. If any malfunction is discovered,
please contact your nearest sales office or representative, or call Customer Service at (651) 490-2811 or
(800) 874-2811.
.
CONTENTS
About This Manual.....................................................................................................................2Hiii
Formatting and Typography ....................................................................................................3Hiii
Technical Assistance—Help! ..................................................................................................4Hiii
Chapter 1. Safety......................................................................................................................... 5H1
Safety Warnings......................................................................................................................6H1
Chapter 2. Introduction ..............................................................................................................7H3
Instrument Description ............................................................................................................ 8H3
Unpacking ............................................................................................................................... 9H4
Chapter 3. Instrument Operation............................................................................................... 10H5
Keypad.................................................................................................................................... 11H5
Measurement Screen..............................................................................................................12H6
Powering the Instrument ......................................................................................................... 13H6
Using the AC Adapter .......................................................................................................14H6
Installing the Batteries.......................................................................................................15H6
Zeroing the Manometer...........................................................................................................16H8
Zeroing the Gauge Pressure Sensor ................................................................................17H8
Zeroing the Differential Pressure Sensor ..........................................................................18H8
Connecting the Manometer to the Test Points........................................................................19H8
Attaching the Hoses to the Manometer............................................................................. 20H8
Bleeding the Entrained Air ................................................................................................21H9
Attaching the Hoses to the Test Points ............................................................................. 22H9
Making Pressure Measurements ............................................................................................23H9
Continuous Pressure Measurements.............................................................................. 24H10
Discrete Pressure Measurements................................................................................... 25H10
Making Temperature Measurements ....................................................................................26H10
Connecting the Temperature Probe................................................................................ 27H10
Disconnecting the Manometer from the Test Points .............................................................28H11
Chapter 4. Maintenance and Troubleshooting....................................................................... 29H13
Routine Maintenance ............................................................................................................30H13
Draining the Hoses.......................................................................................................... 31H13
Draining the Manometer Valve........................................................................................ 32H13
In-Line Pressure Snubbers .............................................................................................33H13
Cleaning the In-line Pressure Snubbers .........................................................................34H14
Cleaning the Instrument Housing.................................................................................... 35H14
Battery Charging ................................................................................................................... 36H14
Calibration............................................................................................................................. 37H15
Troubleshooting ....................................................................................................................38H15
Specifications* .......................................................................................................................... 39H17
i
About This Manual
This manual explains how to set up, operate and maintain the Alnor® HM670 Hydronic Manometer. Read
it thoroughly before using the instrument.
Formatting and Typography
Step-by-step instructions are numbered in boldface type: 1, 2, 3, etc., set flush-left against the
margin.
References to keys on the manometer and the instrument's displayed readout are represented by a
typeface called Arial.
Technical Assistance—Help!
For technical assistance or questions about the instrument of this manual, or if the HM670 Hydronic
Manometer needs repair or recalibration, call Technical Support at (651) 490-2811 or (800) 874-2811.
iii
Chapter 1. Safety
Safety Warnings
Carefully read each of the following safety warnings prior to using the HM670 Hydronic
Manometer:
Never use the HM670 Hydronic Manometer or accessories on potable water systems or other systems
which may be used to convey fluids for human or animal consumption.
Never use the HM670 Hydronic Manometer to measure the pressure of volatile, flammable, or
otherwise hazardous fluids or gasses. The instrument is not designed to be intrinsically safe, nor is it
designed for use with caustic or corrosive chemicals.
Never connect the HM670 Hydronic Manometer or accessories to systems which exceed the
instrument’s maximum pressure specification (300 psi; 2068 kPa).
Observe proper safety precautions and wear appropriate personal protective equipment, including
gloves and eyewear, when working on high pressure or temperature systems. Ruptured or leaking
lines pose a potential risk of serious personal injury.
When using the HM670 Hydronic Manometer, verify all hose connections are secure prior to taking
pressure measurements. Loose connections may result in the discharge of pressurized water or air,
posing a potential risk of serious personal injury.
Exercise caution when disconnecting the HM670 Hydronic Manometer from a pressurized system.
Water or air discharged under pressure poses the potential risk of serious personal injury.
Exercise caution in using the HM670 Hydronic Manometer near electrical equipment. Water spray
associated with purging or disconnecting hoses presents a potential risk of damage to such equipment.
Thoroughly drain and dry the HM670 Hydronic Manometer hoses and internal piping after each use.
This will help in limiting the potential for growth of hazardous microorganisms.
1
A
A
Chapter 2. Introduction
The HM670 Hydronic Manometer is an easy-to-use instrument designed for the accurate measurement of
pressure in non-potable water and air systems. Features of the manometer include the following:
Single-function keys for ease of use
Simultaneous measurement and display of High-side gauge and Differential pressure
Calculation and display of Low-side gauge pressure
User-selectable units of measure
User-selectable time constant
Easy to read dot matrix LCD with backlight
Power input via AC adapter or batteries (alkaline or rechargeable NiMH)
Internal NiMH battery charging
Automatic power shutoff
Splash-proof case
Rugged carrying case for storage of meter, hoses, accessories, tools, and paperwork
Instrument Description
The HM670 Hydronic Manometer includes a meter, hard carrying case, (2) 6-foot (1.8 m) hoses with
shut-off valves, (2) P/T gauge adapter probes, (2) B&G readout probes, (2) ¼” Flare male × ¼” NPT male
fittings, AC adapter, (4) NiMH batteries, neck strap, owner’s manual, and NIST traceable certificate.
An accessory temperature probe is available as an optional tool for the HM670 Hydronic Manometer. The
1
⁄8” diameter, stainless steel sheathed immersion probe is designed for measurement of water line
temperatures.
Bottom Port Cover
Keypad
Dot Matrix
LCD Display
Valve Handle
Neck/Hanging
Strap Clips
Pressure
Ports
C Power
dapter
Input Port
USB Port (for factory
calibration)
Temperature Port
for Optional Probe
Temperature Port Cover
Figure 1: HM670 Meter Description
3
Unpacking
As you unpack the instrument and accessories, check the components against your packing list. If any
parts are missing or damaged, notify Alnor immediately. Tables 1 and 2 list available standard and
optional components for the HM670 Hydronic Manometer.
Table 1: Standard Components
Item Part No.
Carrying case 1319409
Red hose assembly with shut-off valve 632650035
Blue hose assembly with shut-off valve 632650034
P/T gauge adapter probes (2) 632360004
B&G readout probes (2) 632360010
AC adapter 2182003
AA-size NiMH battery, four required 1208048
Battery holder 1801206
Neck strap 2913011
Owner’s manual 1980517
Pocket screw driver 3012054
Table 2: Optional Components
Item Part No.
6 in. (15 cm), 0.125” (3.175 mm) diameter Temperature Probe 801291
12 in. (30 cm), 0.125” (3.175 mm) diameter Temperature Probe 801292
Accessory fittings kit (U.S.A.) HMFIT
Please complete the registration card included with this product and mail it promptly. The card allows us
to inform you of product updates. If you prefer, you may register through our website at
0Hwww.alnor.com.
4 HM670 Hydronic Manometer
Chapter 3. Instrument Operation
Keypad
Each key and its function is described below.
READ
Pressing the READ key initiates taking a time-averaged reading based on the current setting of the
time constant (TC). Upon taking the reading, the values are displayed on-screen for a period of ten
(10) seconds or until the READ key has been pressed again.
UNITS GAUGE
Pressing the UNITS GAUGE key allows for toggling through the available units for gauge pressure
measurements (High P and Low P). The available units of measurement are: psi, inH
inHg, kPa, mH
O, mmHg, and bar.
2
UNITS ΔP
Pressing the UNITS ∆P key allows for toggling through the available units for differential pressure
measurements (dP). The available units of measurement are: psi, inH
O, ftH2O, inHg, kPa, mH2O,
2
mmHg, and bar.
Note: When using the accessory temperature probe, the unit of measurement for temperature (°F or
°C) is driven by the selected unit of measurement for differential pressure:
Differential pressure in psi, inH
Differential pressure in kPa, mH
O, ftH2O, or inHg → temperature in °F
2
O, mmHg, or bar → temperature in °C
2
ZERO GAUGE
Pressing the ZERO GAUGE key initiates zeroing of the gauge pressure sensor.
Note: Proper zeroing of the gauge pressure sensor is achieved with the High pressure (+) port
open to atmosphere and the valve handle in the MEASURE position.
TIME CONSTANT
Pressing the TIME CONSTANT key allows for toggling through the available settings for the time
constant (TC) as follows: 1, 5, 10, 20, and 30 seconds. The current setting of the time constant is
indicated on the display.
Notes: The time constant is the sampling period over which the manometer averages pressure
measurements. Example: with the time constant equal to ten (10) seconds, the displayed
reading represents the average of measurements taken over the previous ten (10) seconds.
Increasing the time constant will serve to improve measurement stability, particularly when
measuring systems with fluctuating pressures.
CONTRAST S
Press the CONTRAST ▲ key to increase the display contrast.
O, ftH2O,
2
5
CONTRAST T
r
Press the CONTRAST ▼ key to decrease the display contrast.
ON/OFF
Press the ON/OFF key to turn the HM670 Hydronic Manometer on or off.
Press the BACKLIGHT key to turn the display’s backlighting on or off.
Note: Backlighting has a significant impact on battery life. Use backlighting only when working in
areas where you cannot read the display with existing light.
Measurement Screen
*Shown with the accessory temperature probe attached
High-Side Gauge
Pressure
Low-Side Gauge
Pressure
*Temperature
Differential
Pressure
Time Constant
Figure 2: Pressure Screen
Battery Status o
Power Input Type
Powering the Instrument
The HM670 Hydronic Manometer can be powered by four (4) AA-size batteries (alkaline or rechargeable
NiMH) or the AC adapter.
Using the AC Adapter
The AC adapter allows the HM670 Hydronic Manometer to be powered from a standard AC wall outlet.
When using the AC adapter, alkaline batteries (if installed) will be bypassed. The AC adapter also charges
the NiMH type batteries (if installed) in the unit.
Note: With the battery-type selection switch set to NiMH, the manometer will initiate charging the
batteries whenever the AC adapter is connected.
Installing the Batteries
To install/replace the batteries:
1. Turn the manometer off and locate the battery cover on the back of the unit.
2. Loosen the screw on the battery compartment cover and lift to remove.
6 HM670 Hydronic Manometer
3. Remove the battery holder. Tapping the backside of the meter against your hand may help in
removing the battery holder.
4. Remove the old batteries and replace with fresh batteries (alkaline or rechargeable NiMH). Ensure
that the batteries are correctly oriented within the battery holder.
5. Set the battery-type selection switch to indicate the type of batteries to be used (alkaline or
rechargeable NiMH).
Battery Type
Selection Switch
Figure 3: Location of Battery-Type Selection Switch
Reinstall the battery holder. Ensure the battery holder orientation is such that its terminals make
6.
contact with the spring contacts within the battery compartment.
7. Replace the battery compartment cover.
Notes: The NiMH batteries included with the instrument may require recharging prior to first use.
Fully charged batteries should enable the instrument to operate for a period of at least 12 hours.
Setting the battery-type selection switch properly will prevent unwanted charging of non-
rechargeable alkaline batteries and provide charging of NiMH batteries when the AC adapter is
connected.
A battery charge life remaining indicator is shown on the display whenever the manometer is
powered by batteries, and turned on.
When using NiMH batteries, the indicator of battery charge life remaining will not be accurate
due to their inherent non-linear voltage drop with power use.
Due to the danger of battery leakage, remove batteries from the battery compartment prior to
storage.
Never mix battery types.
For maximum battery life, ensure backlight is “off” when not needed.
Chapter 3. Instrument Operation 7
Zeroing the Manometer
The HM670 Hydronic Manometer is equipped with both a gauge and differential pressure sensor,
allowing for simultaneous measurement and display of High-side gauge and Differential pressure. The
gauge and differential pressure sensors are zeroed independently of one another.
Zeroing the Gauge Pressure Sensor
To ensure the most accurate gauge pressure (High P) measurements, the HM670 gauge pressure sensor
should be zeroed prior to taking readings on each new system. The gauge pressure sensor is zeroed as
follows:
1. Disconnect the High pressure (red) hose from the manometer such that the High pressure (+) port is
open to atmosphere.
2. Turn the valve handle on the manometer to the MEASURE position.
3. Press the ZERO GAUGE key.
4. Allow the manometer to stand undisturbed for five (5) seconds until the zero gauge pressure sensor
function has completed.
Note: The zero offset of the gauge pressure sensor is sensitive to temperature changes. If moving
the manometer between areas of extreme temperature difference, it is best to allow the meter
to settle to the new temperature prior to zeroing.
Zeroing the Differential Pressure Sensor
To ensure the most accurate differential pressure (dP) measurements, the HM670 differential pressure
sensor should be zeroed prior to taking readings on each new system. The differential pressure sensor is
zeroed as follows:
1. Turn the valve handle on the manometer to the BYPASS position.
2. Follow the on-screen instruction to complete the differential pressure sensor zeroing process.
Notes: Any pressures applied to the hoses will not affect the dP zeroing function. This feature allows
for successful zeroing of the differential pressure sensor while maintaining connections to the
system under test.
The differential pressure sensor is zeroed any time the valve handle has been turned to the
BYPASS position with the meter turned on. This feature allows for successful zeroing of the
differential pressure sensor while entrained air is being purged from the hoses.
The zero offset of the differential pressure sensor is sensitive to temperature changes. If
moving the manometer between areas with extreme temperature difference, it is best to allow
the meter to settle to the new temperature prior to zeroing.
Connecting the Manometer to the Test Points
Attaching the Hoses to the Manometer
1. Connect the straight female flare fitting on the High pressure (red) hose to the male fitting on the top
of the manometer marked with a plus (+) sign.
8 HM670 Hydronic Manometer
2. Connect the straight female flare fitting on the Low pressure (blue) hose to the male fitting on the top
of the manometer marked with a minus (-) sign.
Bleeding the Entrained Air
To ensure the most accurate pressure measurements, all entrained air within the hoses should be purged as
follows:
1. Turn the shut-off ball valve on both the High and Low pressure hoses to the closed position.
2. Turn the valve handle on the manometer to the MEASURE position.
3. Using an appropriate fitting, connect the open end of the High pressure (red) hose to the test point
with the higher line pressure.
4. Attach the appropriate fitting to the open end of the Low pressure (blue) hose.
5. To ensure all the air is bled from the hoses, hold the open end of the Low pressure (blue) hose in an
upright position over a suitable receptacle or near a drain.
6. Turn the shut-off ball valve on both the High and Low pressure hoses to the open position.
7. Turn the valve handle on the manometer to the BYPASS position to allow the liquid flow to displace
the entrained air.
Note: Zeroing of the differential pressure sensor is initiated any time the valve handle has been
turned to the BYPASS position with the meter turned on. This feature allows for successful
zeroing of the differential pressure sensor while entrained air is being purged from the hoses.
8. Once the liquid is flowing steadily from the Low pressure (blue) hose, turn the valve handle on the
manometer to the MEASURE position.
Note: The time to fully prime the hose with fluid may take up to one minute depending on the line
pressure. Higher line pressure will reduce the bleed time.
Attaching the Hoses to the Test Points
1. As indicated above, use an appropriate fitting to connect the open end of the High pressure (red) hose
to the test point with the higher line pressure.
2. Using an appropriate fitting, connect the open end of the Low pressure (blue) hose to the test point
with the lower line pressure.
Note: If the hoses are connected in the inverse orientation (i.e., High pressure (red) hose to the
lower line pressure), the displayed High-side gauge pressure (High P) will be less than the
Low-side gauge pressure (Low P), and the Differential pressure (dP) will be negative.
Making Pressure Measurements
The HM670 Hydronic Manometer allows for simultaneous measurement and display of the High-side
gauge and Differential pressure. The calculated Low-side gauge pressure is also displayed. The
manometer is equipped to make and display either discrete or continuous pressure measurements.
High-Side Gauge Pressure The High-side gauge pressure measurement is indicated as High P on the manometer display.
Chapter 3. Instrument Operation 9
Low-Side Gauge Pressure
The Low-side gauge pressure reading is indicated as Low P on the manometer display. It represents a
calculated value determined from the measured High-side gauge and Differential pressure as follows:
Low P = High P – dP
Differential Pressure The Differential pressure measurement is indicated as dP on the manometer display.
Continuous Pressure Measurements
The HM670 Hydronic Manometer makes and displays continuous pressure measurements whenever the
manometer is turned on, with the exception of when the READ key is pressed. The displayed readings are
averaged measurements taken over the sampling period as defined by the current time constant setting.
The display is updated once per second.
Discrete Pressure Measurements
Taking a discrete pressure measurement allows for measurement and display of a single time-averaged
reading taken over the sampling period as defined by the current time constant setting. Discrete pressure
measurement values are displayed on-screen for a period of 10 seconds or until the READ key has been
pressed again.
1. Press the READ key.
2. Allow the manometer to stand undisturbed until the reading is complete (time of completion
dependent on the time constant setting).
Making Temperature Measurements
The accessory temperature probe is an optional tool for the HM670 Hydronic Manometer. The 1/8”
diameter, stainless steel sheathed immersion probe is designed for measurement of water line
temperatures. When using the accessory temperature probe, the HM670 Hydronic Manometer is equipped
to make and display either discrete or continuous temperature measurements.
Connecting the Temperature Probe
Connect the keyed 3-pin plug of the accessory temperature probe to the mating connector located on the
right-hand side of the manometer.
Notes: A locking nut is provided on the accessory temperature probe plug to allow for a more secure
attachment when connecting to the manometer.
When using the accessory temperature probe, the unit of measurement for temperature (°F or °C)
is driven by the selected unit of measurement for differential pressure:
Differential pressure in psi, inH
Differential pressure in kPa, mH
O, ftH2O, or inHg → temperature in °F
2
O, mmHg, or bar → temperature in °C
2
10 HM670 Hydronic Manometer
Disconnecting the Manometer from the Test Points
Caution should be exercised when disconnecting the HM670 Hydronic Manometer from a pressurized
system, as water or air discharged under pressure poses the potential risk of serious personal injury. The
following provides a guideline for disconnecting the manometer from the test points once measurements
have been completed.
1. Turn the shut-off ball valve on both the High and Low pressure hoses to the closed position.
2. Disconnect the High pressure (red) hose from the higher line pressure test point.
3. Disconnect the Low pressure (blue) hose from the lower line pressure test point.
Note: If additional measurements at another location/system containing the same fluid are to be
made, it is not necessary to proceed to step 4 and drain the fluid entrained within the hoses at
this time. The fluid remaining within the hoses will help minimize the time necessary to bleed
entrained air prior to making subsequent measurements.
4. Place the open end of the Low pressure (blue) hose in a suitable receptacle or near a drain.
5. Turn the valve handle on the manometer to the BYPASS position.
6. Turn the shut-off ball valve on the Low pressure (blue) hose to the open position to discharge the
pressurized fluid out of the open end of the Low pressure (blue) hose.
7. Elevate the High pressure (red) hose and turn its shut-off ball valve to the open position to allow for
draining of the remaining entrained fluid.
Chapter 3. Instrument Operation 11
Chapter 4. Maintenance and Troubleshooting
The HM670 Hydronic Manometer has been designed to provide long-term field use with minimum
required maintenance. As with any precision electronic device, however, proper care, maintenance, and
handling will further ensure its accurate and reliable operation.
Routine Maintenance
The following guidelines should be followed whenever storing the HM670 Hydronic Manometer:
Draining the Hoses
Fluid within the High (red) and Low (blue) pressure hoses should be properly drained whenever the
instrument is being stored after use.
1. Disconnect the manometer hoses from the test points (reference Chapter 3).
2. Disconnect the High (red) and Low (blue) pressure hoses from the manometer.
3. Turn the shut-off ball valve on both the High and Low pressure hoses to the open position.
4. Using a suitable high pressure air source, blow the entrained liquid from both hoses.
Draining the Manometer Valve
Fluid within the manometer valve should be properly drained whenever the instrument is being stored
after use.
1. Disconnect the High (red) and Low (blue) pressure hoses from the manometer.
2. Turn the valve handle on the manometer to the BYPASS position.
3. Hold the manometer with the pressure ports directed downward to allow liquid to drain from the unit.
4. Turn the valve handle on the manometer to the MEASURE position.
5. Hold the manometer with the pressure ports directed downward to allow liquid to drain from the unit.
Note: The HM670 Hydronic Manometer should be stored with the valve handle in the MEASURE
position.
In-Line Pressure Snubbers
The blue and red hose assemblies include pressure snubbers. The pressure snubbers must be used to
prevent damage to the pressure sensors from unexpected water hammering or pressure spikes. Do not use
the HM670 Hydronic Manometer without the pressure snubbers installed in the hose assemblies or sensor
damage will occur.
Short Hose Section
Shut-Off Valve
Figure 4: Inline Filter Assembly
Pressure Snubber
13
Cleaning the In-line Pressure Snubbers
The HM670 Hydronic Manometer is equipped with in-line pressure snubbers upstream of the shut-off
ball valve on both the High and Low pressure hoses. These pressure snubbers should be flushed
periodically with clean water to minimize potential clogging.
1. Disconnect the hose from the manometer.
2. Turn the shut-off ball valve on the hose to the closed position.
3. Connect the straight female flare fitting (farthest from the hose shut-off valve) on the hose to a
suitable water source.
4. Place the open end of the hose in a suitable receptacle or near a drain.
5. Turn the shut-off ball valve on the hose to the open position and allow water to flush through for
several minutes.
6. Using a suitable high pressure air source, blow the entrained water from the hose.
7. Repeat for the other hose.
Cleaning the Instrument Housing
The HM670 Hydronic Manometer may be cleaned using a soft, damp, clean cloth.
Note: Solvents or abrasive cleaners should never be used to clean the instrument housing, keypad, or
display.
Battery Charging
The HM670 Hydronic Manometer allows for internal charging of AA-size type NiMH (only) batteries.
Charging of the batteries is initiated as follows:
1. Turn the manometer off and locate the battery cover on the back of the unit.
2. Loosen the screw on the battery compartment cover and lift to remove.
3. Remove the battery holder. Tapping the backside of the meter against your hand may help in
removing the battery holder.
4. Verify the batteries installed are rechargeable type NiMH.
5. Set the battery-type selection switch to NiMH.
6. Reinstall the battery holder. Ensure the battery holder orientation is such that its terminals make
contact with the spring contacts within the battery compartment.
7. Replace the battery compartment cover.
8. Plug in the AC adapter.
Notes: Full charge of the batteries is achieved within four (4) hours.
Fully charged batteries should enable the instrument to operate for a period of at least 12
hours.
The manometer remains fully operational while charging batteries.
Never attempt to charge battery types other than AA-size rechargeable NiMH.
Never mix battery types.
14 HM670 Hydronic Manometer
NiMH batteries should only be charged at room temperature. Starting with batteries that are
too cold or too warm can cause the charge cycle to stop early.
For maximum battery life, ensure the backlight is “off” when not needed.
Calibration
TSI recommends that the HM670 Hydronic Manometer receive an annual calibration. TSI can also verify
calibration of the instrument and re-issue a certificate of calibration with traceability to NIST. This
“annual checkup” helps to ensure the specified accuracy of the instrument is maintained.
To calibrate the instrument, please ship TSI the complete package that includes the meter and accessory
temperature probe. Everything should be packed carefully within the carrying case and then inside a
shipping box. The original shipping box is preferred. Prior to shipment, please contact Customer Service
for an RMA (Return Materials Authorization) number at (651) 490-2811, (800) 874-2811; or visit the
service page on our website at
1Hwww.alnor.com to complete an RMA# form online.
Ship directly to: TSI Incorporated
ATTN: Customer Service
500 Cardigan Road
Shoreview, MN 55126-3996
Troubleshooting
The following table lists the symptoms, possible causes, and recommended solutions for common
problems encountered with the instrument. If your symptom is not listed, or if the recommended solutions
do not address your problem, please contact the factory.
Symptom Possible Causes Corrective Action
No display Unit not turned on.
Low or dead batteries.
Dirty battery contacts.
AC adapter not connected.
Low battery charge.
“ “
flashing on display
“8888”
flashing on display
Dirty battery contacts.
The indicated measurement is
out of range.
Press On/OFF key.
Replace or recharge the batteries.
Clean the battery contacts.
Plug in AC adapter.
Replace or recharge the batteries.
Clean the battery contacts.
The allowable ranges for pressure and
temperature measurements are shown on
the specifications page.
“-----”
on display
The indicated value is invalid. The allowable ranges for pressure and
temperature measurements are shown on
the specifications page.
Chapter 4. Maintenance and Troubleshooting 15
The following table lists error codes which can be displayed should the instrument detect a problem.
Should any of these error codes recur repeatedly, the instrument should be returned to the factory for
servicing.
Error Code Possible Causes
RTC CODE: Problem detected in reading or setting the time and date.
COUNTER CODE: Problem detected with the counter chip.
LCD CODE: Problem detected in writing to the display.
ADC7718 CODE: Problem detected in reading the pressure voltage.
ADC3300 CODE: Problem detected in reading a non-pressure voltage.
EEPROM A CODE:
EEPROM B CODE:
Problem detected in reading from or writing to one of the chips that
store calibration data, user settings and logged data.
USB CODE: Problem detected with the USB chip.
Calibration CODE: The meter’s calibration data has been corrupted.
The Lithium Battery is Low. Low voltage detected on the on-board lithium battery.
16 HM670 Hydronic Manometer
Specifications*
Range
Differential Pressure ......... 0 to 300 psi (0 to 2068 kPa)
Gauge Pressure................ 0 to 300 psi (0 to 2068 kPa)
Operating Temperature .... 40 to 100°F (4 to 38°C) electronics
Storage Temperature ....... 0 to 140°F (-18 to 60°C)
Temperature Probe**........ –40 to 250°F (-40 to 121°C)
Resolution
Pressure (best) ................. 0.001 psi (0.01 kPa)
Temperature** .................. 0.1°F (0.1°C)
Accuracy
Pressure
Temperature** .................. ±0.5°F (0.3°C) from 32 to 160°F (0 to 71°C);
max ±2.0°F (1.2°C) from -40 to 32°F (-40 to 0°C) and from 160 to 250°F
Units
Pressure ........................... psi, in. H
Temperature** .................. degrees F, degrees C
Time Constant ....................... user selectable (1 to 30 seconds)
Display.................................... dot matrix LCD with backlight
Dimensions (meter only)........ 11.1 in. × 4.7 in. × 3.5 in. (28.2 cm × 11.9 cm × 8.8 cm)
Pressure Connection............ ¼” 37° Flare Fitting, Male
Weight with Batteries............ 2.65 lb. (1.20 kg)
Power Requirements ............ four AA-size cells, alkaline or rechargeable NiMH (included), or AC
Battery Life
Recharge Time ...................... 4 hours (internal charger)
Warranty................................. 2 year factory warranty
*Specifications are subject to change without notice.
**Optional accessory
1
Accuracy statement applies from 0–250 psi (0–1724 kPa).
2
The minimum battery life stated will occur after the NiMH batteries have been recharged 2-3 times after initial charge.
1
......................... ±1% of reading or .072 psi (0.5 kPa), whichever is greater
(71 to 121°C)
O, ft H2O, kPa, mm Hg, in. Hg, m H2O, bar
2
adapter (included) 7.5 VDC, 1.6 A, regulated
2
........................... minimum of 12 hours with backlight on
minimum of 18 hours with backlight off
17
P/N 1980517 Rev C Copyright © 2008 by TSI Incorporated Printed in U.S.A.
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