Shortridge Instruments ADM-860C Operating Instructions Manual
AIRDATA™ MULTIMETER ADM-860C
ELECTRONIC MICROMANOMETER
WITH RS232 COMMUNICATIONS PORT
AIR FLOW • VELOCITY • PRESSURE • TEMPERATURE
OPERATING INSTRUCTIONS
Shortridge Instruments, Inc.
S
i
7855 East Redfield Road / Scottsdale, Arizona 85260-3430
®
Phone (480) 991-6744 • Fax (480) 443-1267
www.shortridge.com
ADM-860C 04/14/08
CONTENTS
1.0 INTRODUCTION 1
1.1 GENERAL DISCUSSION 1
2.0 SPECIFICATIONS 2
3.0 EXTERNAL FEATURES 4
3.1 KEYPAD 4
3.2 FEATURES ON SIDES AND BACK OF METER 4
4.0 DISPLAY MESSAGES AND PROMPTS 7
4.1 READ PROMPTS 7
4.2 MEASUREMENT READOUTS 7
4.3 FUNCTION READOUTS 8
5.0 USING THE AIRDATA MULTIMETER 16
5.1 GENERAL USE 16
5.2 TREND READINGS 17
5.3 MEMORY/AVERAGE/TOTAL FUNCTION 17
5.3.1 MEMORY OPERATION 17
5.3.2 RECALL 18
5.3.3 REPLACE READING IN MEMORY 18
5.3.4 ERASE READING IN MEMORY 18
5.3.5 CLEAR MEMORY 19
5.4 DATA DOWNLOAD TO A PRINTER 19
5.4.1 DOWNLOAD INDIVIDUAL READINGS TO A PRINTER 19
5.4.2 DOWNLOAD READINGS IN MEMORY TO A PRINTER 19
5.5 DATA DOWNLOAD TO A COMPUTER 20
5.5.1 CONFIGURATION FILE SET-UP IN WINWEDGE 21
5.5.2 PORT AND DATA INPUT SETTINGS 22
5.5.3 FUNCTION KEY COMMANDS 22
5.5.4 SET-UP CONNECTIONS AND OPEN THE APPLICATIONS 23
5.5.5 INDIVIDUAL READINGS CONTROLLED FROM COMPUTER KEYBOARD 23
5.5.6 DOWNLOAD READINGS FROM MEMORY USING COMPUTER KEYBOARD 23
5.5.7 CONTROL BUTTONS, CURSOR CONTROL, AND FILE PATHS 23
5.5.8 AUTOMATIC REPEAT READINGS CONTROLLED BY WINWEDGE 24
5.5.9 MINIMIZING WINWEDGE 25
5.5.10 ALTERNATIVE DOWNLOAD METHOD 25
6.0 VELOCITY MEASUREMENT 26
6.1 VELOCITY CORRECTION FACTORS 26
6.2 PITOT TUBE VELOCITY MEASUREMENT 27
6.3 AIRFOIL VELOCITY MEASUREMENT 29
6.3.1 DUCT VELOCITY USING AIRFOIL PROBE 30
6.3.2 FUME HOODS AND SAFETY CABINETS - AIRFOIL PROBE 30
6.3.3 EXHAUST HOODS - AIRFOIL PROBE 30
6.3.4 LAMINAR FLOW WORKSTATIONS - AIRFOIL PROBE 31
6.4 SINGLE POINT CENTERLINE AIR VELOCITY MEASUREMENTS 31
6.5 VELGRID AIR VELOCITY 31
6.5.1 CHEMICAL EXHAUST HOODS - VELGRID 32
6.5.2 LAMINAR FLOW WORKSTATION - VELGRID 32
6.5.3 AIR FLOW CALCULATION FROM VELGRID VELOCITY 32
7.0 PRESSURE MEASUREMENT 34
7.1 DIFFERENTIAL PRESSURE 34
7.1.1 STATIC PRESSURE PROBES 34
7.1.2 PITOT TUBE "VELOCITY PRESSURES" 34
7.1.3 PITOT TUBE "STATIC PRESSURES" 35
7.1.4 PITOT TUBE "TOTAL PRESSURES" 35
7.2 ABSOLUTE PRESSURE 35
ADM-860C 04/14/08i
8.0 TEMPERATURE MEASUREMENT 36
8.1 TEMPROBE 36
8.2 AIRDATA MULTITEMP 36
9.0 AIR FLOW MEASUREMENT 39
9.1 FLOWHOOD FUNCTION 39
9.2 BACKPRESSURE COMPENSATION 39
10.0 FLOWHOOD ASSEMBLY 40
10.1 UNPACKING 40
10.2 FRAME ASSEMBLIES 40
10.3 FABRIC TOPS 40
10.4 TOP SUPPORT ASSEMBLY 40
10.5 HANDLE 41
11.0 FLOWHOOD OPERATING PROCEDURE 46
11.1 AIR FLOW - NONBACKPRESSURE COMPENSATED READINGS 46
11.2 AIR FLOW - BACKPRESSURE COMPENSATED READINGS 46
11.2.1 MEMORY DISPLAY IN FLOWHOOD MODE 47
11.2.2 RATIO ERR DISPLAY 47
12.0 SPECIAL BALANCING PROCEDURES 48
12.1 PROPORTIONAL BALANCING 48
12.2 LARGE RETURN AIR GRILLES 48
12.3 KITCHEN EXHAUST HOODS 48
12.3.1 RANGE EXHAUST FILTERS AND GREASE EXTRACTORS 48
12.4 CONSTANT VOLUME CONTROLLERS 48
12.5 LINEAR SLOT DIFFUSERS 49
12.6 SIDEWALL REGISTERS 49
12.7 14"x14"x14" SHORT TOP SET 49
12.8 SYSTEM PROBLEMS 49
13.0 CORRECTION FACTORS 50
13.1 BAROMETRIC PRESSURE DENSITY CORRECTION - LOCAL DENSITY 50
13.2 BAROMETRIC PRESSURE DENSITY CORRECTION - STANDARD DENSITY 50
13.2.1 STANDARD DENSITY - TEMPROBE USED 50
13.2.2 STANDARD DENSITY - TEMPROBE NOT USED 50
13.3 TEMPERATURE DENSITY CORRECTION 50
13.4 RELATIVE HUMIDITY CORRECTION 50
13.5 HOT WIRE ANEMOMETER VERSUS AIRDATA MULTIMETER 51
14.0 METER ACCURACY FIELD TESTING 52
14.1 METER ZERO FUNCTION 52
14.2 DIFFERENTIAL PRESSURE FUNCTION 52
14.3 ABSOLUTE PRESSURE FUNCTION 52
14.4 AIR FLOW ACCURACY 52
14.5 DUCT TRAVERSE COMPARISONS, INCLINED MANOMETER, MICROMANOMETER 53
14.6 DUCT TRAVERSE USING THE AIRDATA MULTIMETER 53
14.7 BACKPRESSURE COMPENSATED COMPARISON READING 53
14.8 NONBACKPRESSURE COMPENSATED COMPARISON READING 53
15.0 METER MAINTENANCE 54
16.0 FLOWHOOD MAINTENANCE 54
17.0 RECALIBRATION AND REPAIR INFORMATION 55
AIR BALANCE MANUALS & TRAINING PROGRAMS 55
WARRANTY 56
APPENDIX A - NIST VELOCITY TESTING 57
ADM-860C 04/14/08ii
APPENDIX B - LABORATORY DIFFERENTIAL PRESSURE TEST 58
APPENDIX C - BATTERY TEST PROCEDURE 59
PROLONGING BATTERY LIFE 60
BATTERY RECYCLING 60
REPLACEMENT PARTS LIST 61
INDEX 63
Copyright © Shortridge Instruments, Inc., 2008. All rights reserved. This information
may not be reproduced or duplicated in any manner, or for any purpose, without
permission in writing from Shortridge Instruments, Inc.
ADM-860C 04/14/08iii
ILLUSTRATIONS
3.1 ADM-860C METER FRONT AND BACK 6
6.1 PITOT TUBE 28
6.2 AIRFOIL PROBE 29
6.3 VELGRID ASSEMBLY 33
7.1 STATIC PRESSURE PROBE 34
8.1 ADT442 TEMPROBE 36
8.2 AIRDATA MULTITEMP 37
10.1 FRAME STORAGE 42
10.2 FLOWHOOD IN CASE 42
10.3 FLOWHOOD ASSEMBLY 43
10.4 2X2 FRAME ASSEMBLY 44
10.5 1X4 FRAME ASSEMBLY 44
10.6 2X4 FRAME ASSEMBLY 44
10.7 1X5 FRAME ASSEMBLY 45
10.8 3X3 FRAME ASSEMBLY 45
ADM-860C 04/14/08iv
1.0 INTRODUCTION
1.1 GENERAL DISCUSSION
These instructions will be much easier to follow if the meter is in front of you as you read through them. You can
note the various connections and press the keys, observing the displayed results as you read through the various
procedures. The operation of the meter is quite simple and straightforward, as will become apparent after a little
practice.
The ADM-860C AirData Multimeter performs the following essential functions. This meter measures air velocity
when used with a pitot tube, AirFoil probe, or VelGrid, and automatically corrects for density variations due to local
temperature and barometric pressure. When used with the Series 8400 FlowHood Kit, this meter measures air
flow and compensates for air density and backpressure effects, allowing direct air flow readings. Accurate
differential pressure measurements can be obtained using static pressure probes, pitot tubes, or any direct
pressure source. Temperature and absolute pressure measurements can be taken over a wide range.
The Model ADM-860C AirData Multimeter features sequential storage and recall of up to 100 individually obtained
measurements, with sequence tags for each value. Recall of the sum and average, along with the minimum and
maximum readings for the stored sequence is available at any point, without terminating the process.
The ADM-860C has an RS232 port that may be used with a portable printer. The optional printer and cable can
download each reading as it is taken, or the contents of the memory can be downloaded and printed all at once.
The RS232 link may also be used in conjunction with optional WinWedge software or HyperTerminal Private
Edition and a computer to download readings directly into any 32 bit Windows® (95, 98, ME, NT 2000, XP or
VISTA) application for display, analysis, and manipulation.
Internal calibration and zeroing of the AirData Multimeter are fully automatic. No external adjustments are ever
needed. This instrument is extremely tolerant of overpressure, and is unaffected by position or ambient
temperatures from 40
/ F to 140 / F.
It is recommended that the AirData Multimeter kit be returned to the factory at least every two years for
recalibration and software update. This preventive maintenance program will assure that the original accuracy
of the meter is maintained throughout the life of the meter.
ADM-860C 04/14/081
2.0 SPECIFICATIONS
AIR VELOCITY: Measured in feet per minute (fpm), or meters per second (m/s), corrected for local air density.
The measurement range is 25 to 29,000 fpm with a pitot tube, and 25 to 5,000 fpm with the Shortridge
Instruments, Inc. AirFoil probe. The measurement range using the VelGrid is 25 to 2500 fpm. Accuracy
is ± 3% of reading ± 7 fpm from 50 to 8000 fpm. Pitot tube velocity readings from 8,000 fpm to 29,000 fpm
are based on compressible isentropic flow theory and are not certified NIST traceable.
DIFFERENTIAL PRESSURE: Measured in inches of water column (in wc) or Pascals (Pa). The measurement
range is from 0.0001 to 60.00 in wc. Maximum safe pressures are 20 psid (900% full scale) and 60 psia
common mode. Accuracy is ± 2% of reading ± 0.001 in wc from 0.0500 to 50.00 in wc.
ABSOLUTE PRESSURE: Measured in inches of mercury (in Hg) or bars with reference to a vacuum. The
measurement range is 10-40 in Hg. Maximum safe pressure is 60 psia. Accuracy is ± 2% of reading ± 0.1
in Hg from 14 to 40 in Hg.
TEMPERATURE: Accuracy is ± 0.5
ADT443, ADT444, ADT445 or ADT446 TemProbes. Meter will display readings from -67.0
/ F from 32/ F to 158/ F with a resolution of 0.1/ F using the ADT442,
/ F to 250.0/
F. Safe exposure range for TemProbe is -100/ F to 250/ F. Do not expose the plastic base of the
TemProbe or the extension wand to temperatures above 200
/ F.
AIR FLOW: Measured in cubic feet per minute (cfm) or liters per second (L/s), corrected for local air density. This
function requires the use of the Shortridge Instruments' Series 8400 Backpressure Compensating
FlowHood System. The measurement range is 25 to 2500 cfm supply and 25 to 1500 cfm exhaust.
Accuracy is ± 3% of reading ± 7 cfm from 100 to 2000 cfm (nonbackpressure compensated readings).
AIR DENSITY CORRECTION: The air density correction range is 14-40 in Hg and 32
/ F to 158/ F for correction
of air flow and velocity measurements. The readings represent local density air flow or velocity corrected
for the density effects of temperature and absolute pressure.
MEMORY:100 readings with sequential recall of each reading with the average, the sum, minimum and maximum
readings.
RESPONSE TIME: Varies from one second at higher pressure inputs to seven seconds at less than 0.0003 in
wc (70 fpm). Extremely low pressure/flow/velocity inputs require longer sample times than higher
pressure/flow/velocity inputs. TREND mode provides continuous readings in less than two second
intervals. (Accuracy specifications do not apply in TREND mode).
READOUT: Ten digit, 0.4 inch, liquid crystal display (LCD).
METER HOUSING: High impact, molded, "T" grade ABS.
METER WEIGHT: 36 ounces (1.02 kg), including batteries.
SIZE: 6.0" x 6.4" x 2.7" (15.2 x 16.3 x 6.9 cm).
BATTERY LIFE: A ten-hour charge will normally allow two working days of heavy use, or up to 3000 readings
per charge if the back-light is not being used. Increasing the charge time to 48 hours (such as a weekend)
will increase the working time by 25%. Continuous use of the back-light may reduce the battery life by up
to one half.
A set of rechargeable type AA NiCad batteries is supplied in each meter. Each battery has a storage
capacity of 1100 milliAmp hours. These batteries may be recharged up to 500 times before replacement.
If 1100 mAh batteries are not available in a field situation, 700 mAh batteries (all 12 ) may be substituted.
If 700 mAh batteries are mixed with 1100 mAh batteries, the 700 mAh batteries may be damaged as the
battery charge is depleted. If rechargeable batteries are not available in a field situation, the batteries may
be replaced with 12 non-rechargeable "AA" pen cell batteries.
ADM-860C 04/14/082
WARNING: Do not plug the charger in if any non-rechargeable batteries are in the meter. The meter will
be seriously damaged along with the batteries and charger.
The approximate level of charge remaining in the batteries may be displayed by pressing SHIFT/SHIFT.
The display will read BATT FULL if the batteries are highly charged. The display will read BATT 2/3, BATT
1/3, or LOCHARGE as the level of charge decreases.
NOTE: A battery charge level displayed when the meter is first turned on may not be representative of the
true level of battery charge. Wait five or ten minutes after turning the meter on to view the charge status.
BATTERY CHARGERS: The battery charger (P/N PS8201) used in the U.S.A. and many other countries
requires 120 Volts AC, 60Hz, 8W. The battery charger (P/N PS8202) used in Europe and certain other
locations requires 220 Volts AC, 50Hz. Both chargers deliver 24 Volts AC to the meter. Batteries may
be left on charge for an unlimited time without harm. The temperature of the instrument during charge
should be kept between 40
/ F and 113/ F (5/ C to 45/ C). The meter is fully operational during recharge.
OPERATIONAL TEMPERATURE LIMITS: The specified accuracy for measurements is maintained over a meter
exposure temperature range of 40
/ F to 140/ F (5/ C to 60/ C).
STORAGE TEMPERATURE LIMITS: -4/ F to 140/ F (-20/ C to 60/ C).
AIR BLEED: Each pressure measurement requires a small volume of air to pass through the meter. The
pressure source must be capable of supplying this volume without significant depletion to assure accurate
measurements. Bleed through is typically 0.0004 cubic inch per in wc per measurement. Quiescent bleed
through (maximum) is 0.0005 cubic inch per in wc per minute.
TUBING: The maximum recommended length of pneumatic tubing for the measurement of air flow, velocity, or
differential pressure is 18 feet. Minimum tubing size is 3/16 inch, inside diameter. The VelGrid is used with
the two eight foot lengths of 3/16 inch ID tubing furnished with the kit.
ADM-860C 04/14/083
3.0 EXTERNAL FEATURES
3.1 KEYPAD
The meter keypad has eight keys, each of which may include multiple functions. Functions are activated by
pressing a function key once, twice or in sequence with other keys. This Instruction Manual will often refer to a
key by only one of the functions shown on the key.
A. Upper half of keys SILVER - active only after pressing SHIFT key.
Control name Function
SHIFT Shifts control from lower to upper half of keys.
CLEAR Clears memory, TREND and STORE functions.
OFF Turns the meter off after SHIFT key is pressed.
B. Lower half of keys (or all-black keys) BLACK - always active except following SHIFT.
Control Name Function
MODE Sequential action for all measurement modes (air flow, velocity, pressure and
temperature). Also used to erase, replace and print readings in STORE mode.
UNITS Alternate action for English or metric units.
STORE Activates memory mode, then alternate action for display of the average, total,
minimum and maximum readings.
ON Turns the meter on. Turns light on and off after meter has been turned on.
= RCL Recalls stored readings in reverse order.
< Recalls stored readings in entry order.
RCL
READ Initiate measurement or halt TREND readings.
3.2 FEATURES ON SIDES AND BACK OF METER
BATTERY CHARGER JACK
When viewed from the front, the battery charger jack is on the right side of the meter toward the top. The
battery charger plug is to be connected here.
EXTERNAL READ JACK
When viewed from the front, the external read jack is on the left side of the meter toward the top. The
plug for the external thumbswitch is connected here. This feature allows the operator to trigger
measurements from the FlowHood or VelGrid handgrip while working overhead or in awkward
circumstances. The thumbswitch performs the same function as the READ key.
FLAPS JACK
The flaps jack is on the back of the meter, in the upper right hand corner. The flaps plug on the FlowHood
is inserted here.
TEMPERATURE INPUT JACK
The temperature input jack is centered on the back of the meter, slightly toward the top. The flexible
TemProbe sensor must be connected to this receptacle whenever temperature density correction is
ADM-860C 04/14/084
desired for either flow or velocity measurements. A retractile cord connects the TemProbe or the
MultiTemp to the temperature input jack for remote temperature sensing.
RESET SWITCH
The reset pushbutton switch is on the back of the meter in a recess near the upper left corner. This switch
is used to reset the meter in the unlikely event that the microprocessor becomes lost in its program. This
may occur if the meter is dropped, and may cause the keypad to become nonfunctional until the meter
is reset. If the meter continues to fall into "lockout", it may have been damaged, and should be returned
for repair. Press the reset switch once to restart the meter. Do not hold the switch down or press the
switch twice in close sequence.
PNEUMATIC PRESSURE INLETS
Two pneumatic pressure inlets positive (+) and negative (-) are centered on the back of the meter at the
top edge and may be connected to various pressure sources for the measurement of air velocity, flow,
or pressure. Sources include the FlowHood, AirFoil probe, VelGrid, pitot tubes, static pressure probes,
or any other pressure source not exceeding the safe limits for the meter. The negative (-) inlet senses
the static pressure during flow or velocity measurements, and also is used for direct absolute pressure
measurements.
SERIAL PORT JACK
When viewed from the front, the serial port jack is centered on the right side of the meter just below the
battery charger jack. The circular plug of a custom RS232 serial cable is connected here. The other end
of the cable provides a standard DB9 connection for a printer or computer.
ADM-860C 04/14/085
External Read Jack for
Pushbutton Handle Plug
10 Digit, 0.4" LCD Display
SHIFT Activates Upper Half of Keys
MODE Flow/Pres/Temp/VLG/AFP/Pitot/Abs
Battery Charger Jack
RS232 Serial Port Jack
UNITS English/Metric
GRN LED Indicates if charger is plugged in
Pushbutton Reset Switch
CLEAR
Clear Memory/Trend
STORE Memory/Average/Total
READ Read/Halt Trend Readings
RCL
< Recall in Entry Order
= RCL Recall in Reverse Order
OFF
Power Off after Shift
ON Power On/Turn Light On & Off
Positive (+) Pressure Port
Negative (-) Pressure Port
Flaps Jack for FlowHood Flaps Plug
Threaded Insert for Attachment to FlowHood
with Captive Screw
Calibration Label with Serial Number & Date
FIGURE 3.1 ADM-860C METER FRONT AND BACK
Temperature Input Jack for TemProbe,
Retractile Cord or MultiTemp
Battery Compartment Cover - Remove the 8
Small Phillips Head Screws to Test or Replace
the Batteries (12 AA NICAD)
Four Large Phillips Head Screws That Hold
the Meter Case Together - DO NOT REMOVE
ADM-860C 04/14/086
4.0 DISPLAY MESSAGES AND PROMPTS
4.1 READ PROMPTS
The following ten prompts all include the term READ, which is a signal for the operator to press the READ key
to trigger the actual measurement.
English Units
CF: READ
This display indicates that the meter has been placed in the air flow function (cfm) and will appear
automatically upon power up (following FLO-HOOD) if the flaps plug of the FlowHood is connected to the
meter.
/ F: READ
This display indicates that the meter has been placed in the temperature function (
/ F).
FP: READ
This display indicates that the meter has been placed in a velocity function (fpm).
Hg: READ
This display indicates that the meter has been placed in the absolute pressure function (in Hg) with reference
to a vacuum.
IN: READ
This display indicates that the meter has been placed in the differential pressure function (in wc).
Metric Units
Bar: READ
This display indicates that the absolute pressure readings will be displayed in bars (1 bar = 100 kPa) with
reference to a vacuum.
/ C: READ
Display indicates that the temperature readings will be displayed in degrees Celsius (
/ C).
LS: READ
This display indicates that the meter has been placed in the air flow function and will read in liters per second
(L/s).
MS: READ
This display indicates that the velocity readings will be displayed in meters per second (m/s).
Pa: READ
This display indicates that differential pressure readings will be displayed in Pascals (Pa).
4.2 MEASUREMENT READOUTS
In the following 12 examples, n indicates a number in the displayed result. If no sign is displayed, the result is
a positive number. A negative sign indicates a negative number. English and metric units are shown for each
example.
English Units
CF:c ± nnnn
Indicates that the result represents an air flow measurement (cfm). "C" indicates that the result has been
compensated for backpressure effects.
CF:u ± nnnn
Indicates that the result represents an air flow measurement (cfm). "U" indicates that the result has not been
compensated for backpressure effects.
ADM-860C 04/14/087
FP: ± nnnnnn
Indicates that the displayed result represents a velocity measurement (fpm).
/ F: ± nnn.n
Indicates that the displayed result represents a temperature measurement (
/ F).
Hg: nn.n
Indicates that the result represents an absolute pressure measurement (in Hg).
IN: ± n.nnnn
Indicates that the result represents a differential pressure measurement (in wc).
Metric Units
Bar: n.nnn
Indicates that the result represents an absolute pressure measurement (bar). (One bar = 100 kPa).
/ C: ± nnn.n
Indicates that the displayed result represents a temperature measurement (
/ C).
LS:c ± nnnn
Indicates that the result represents an air flow measurement (L/s). "C" indicates that the result has been
compensated for backpressure effects.
LS:u ± nnnn
Indicates that the result represents an air flow measurement (L/s). "U" indicates that the result has not been
compensated for backpressure effects.
Pa: ± nnn.nn
Indicates that the result represents a differential pressure measurement (Pa).
MS: ± nnn.nn
Indicates that the displayed result represents a velocity measurement (m/s).
4.3 FUNCTION READOUTS
The following prompts and messages are listed in alphabetical order.
$ $ $ $ $ $ $ $
Blocks of pixels will be displayed to test the operation of the display each time the meter is turned on.
nnc nnnn
Displays the number of nonbackpressure compensated readings in memory and the average of just the
nonbackpressure compensated readings taken during a FlowHood reading sequence. Displays the average
of just the backpressure compensated readings taken during a FlowHood reading sequence.
nnc NONE
Displayed if there are no backpressure compensated readings in memory during a FlowHood reading
sequence.
R n.nnnn
nn
Displays the current reading and its place in the reading sequence during a STORE sequence. Number of
decimal places will vary.
R NP 0
nn
Indicates that the current reading in a manual STORE sequence is a negative pitot tube reading.
ADM-860C 04/14/088
nnRc nnnn
This message indicates that backpressure compensated air flow readings are being stored. The display
shows the current reading and its order in the reading sequence during a STORE process.
Ru nnnn
nn
This message indicates that nonbackpressure compensated air flow readings are being stored. The display
shows the current reading and its order in the reading sequence during a STORE process.
S n.nnnn
nn
Displays a reading in memory and its place in the stored reading sequence. Accessed using forward or
reverse RCL keys. Number of decimal places will vary.
S ERASED
nn
This message indicates that the current reading displayed in RECALL (nn
) has been erased.
s
nnS NP 0
This message is displayed when a stored negative pitot tube reading is accessed using a RECALL key.
Sc nnnn
nn
This message indicates a backpressure compensated air flow reading is being viewed in memory. The
display shows the reading and its order in the reading sequence during a STORE process. Accessed using
forward RCL keys.
Su nnnn
nn
This message indicates a nonbackpressure compensated air flow reading is being viewed in memory. The
display shows the reading and its place in the reading sequence during a STORE process. Accessed using
forward RCL keys.
nnu nnnn
Displays the number of nonbackpressure compensated readings in memory and the average of just the
nonbackpressure compensated readings taken during a FlowHood reading sequence.
0 n.nnnn
nn
Displays the number of readings in memory and the average of the readings. Displayed when the STORE
key is pressed during a STORE sequence. Number of decimal places will vary.
3 n.nnnn
Displays the sum of the readings in memory during a STORE sequence. Displayed when the STORE key
is pressed twice if readings are in memory. Number of decimal places will vary.
3c nnnn
Displays the sum of the backpressure compensated readings in memory during a STORE sequence.
Displayed when the STORE key is pressed if readings are in memory. Number of decimal places will vary.
3c NONE
This display indicates that there are no backpressure compensated readings in memory.
3u nnnn
Displays the sum of the nonbackpressure compensated readings in memory during a STORE sequence.
Displayed when the STORE key is pressed if readings are in memory. Number of decimal places will vary.
' n.nnnn
xx
This display indicates that the back-light is on and battery power draw has increased. xx indicates the units
for the reading.
ADM-860C 04/14/089
xx n.nnnn
This display indicates that the battery charge is nearly depleted. xx indicates the units for the reading. The
meter will display LOCHARGE prior to displaying this symbol.
› n.nnnn
xx
This display indicates that the battery is highly charged. xx indicates the units for the reading. The area of
the battery symbol that is dark will decrease incrementally as the battery charge declines.
6 n.nnnn
xx
This display indicates that the meter is in TREND mode and that the readings are remaining relatively
constant . xx indicates the units for the reading.
_ n.nnnn
xx
This display indicates that the meter is in TREND mode and that the readings are increasing slowly. xx
indicates the units for the reading.
8 n.nnnn
xx
This display indicates that the meter is in TREND mode and that the readings are increasing rapidly. xx
indicates the units for the reading.
` n.nnnn
xx
This display indicates that the meter is in TREND mode and that the readings are decreasing slowly. xx
indicates the units for the reading.
9 n.nnnn
xx
This display indicates that the meter is in TREND mode and that the readings are decreasing rapidly. xx
indicates the units for the reading.
¸
n.nnnn
xx
Displays the maximum (greatest value) reading stored in memory during a STORE sequence. Displayed
when the STORE key is pressed four times after HALT during the STORE sequence. Number of decimal
places will vary.
º n.nnnn
xx
Displays the minimum (least value) reading stored in memory during a STORE sequence. Displayed when
the STORE key is pressed three times after HALT during the STORE sequence. Number of decimal places
will vary.
ºc nnnn
xx
Displays the minimum reading of just the backpressure compensated readings stored in memory during a
STORE sequence. Displayed when the STORE key is pressed three times after HALT during the STORE
sequence.
¸
c nnnn
xx
Displays the maximum reading of just the backpressure compensated readings stored in memory during a
STORE sequence. Displayed when the STORE key is pressed three times after HALT during the STORE
sequence.
ºu nnnn
xx
Displays the minimum reading of just the nonbackpressure compensated readings stored in memory during
a STORE sequence. Displayed when the STORE key is pressed three times after HALT during the STORE
sequence.
¸
u nnnn
xx
Displays the maximum reading of just the nonbackpressure compensated readings stored in memory during
a STORE sequence. Displayed when the STORE key is pressed three times after HALT during the STORE
sequence.
ADM-860C 04/14/0810
ABS PRES
This signal will be flashed when the absolute pressure mode is selected, and also each time the READ key
is pressed when in the absolute pressure mode.
ADM-860C
This message is flashed following
$ $ $ $ $ $ $ $
when the meter is first turned on.
AIRFOIL
This signal will be flashed when the AirFoil probe mode is selected and also upon each subsequent operation
of the READ key.
AUTO ZERO
When the meter is first turned ON, it will perform a self-calibration process that takes a few seconds. The
display will read AUTO ZERO during this period and the operating controls will be inhibited. No READ
operations or function changes may be made during the AUTO ZERO period. The meter will also perform
a brief self-calibration cycle periodically throughout normal operation.
BATT 1/3
This message may be displayed following SHIFT/SHIFT and indicates that about one-third of the useful
charge remains in the batteries.
BATT 2/3
This message may be displayed following SHIFT/SHIFT and indicates that about two-thirds of the useful
charge remains in the batteries.
BATT FULL
This message is displayed following SHIFT/SHIFT when the batteries are fully charged.
BATTERY
This message may be displayed as part of a longer message sequence such as NO LIGHT/BATTERY/TOO
LOW.
CF: CORR
This message indicates that the air flow measurement being performed is in cfm and will be backpressure
compensated.
CF: UNCORR
This message indicates that the air flow measurement being performed is in cfm and will not be backpressure
compensated.
CHANGE
This message indicates that a connection to the meter, such as the TemProbe, has been altered. CHANGE
may be preceded by the display of the connection type.
CLEAR
This message is displayed when the operator has pressed SHIFT/CLEAR and no readings are in memory.
CLEAR MEM
This signal is flashed as the STORE functions are cleared.
DIFF PRES
This signal will be flashed when the differential pressure mode is selected, and also upon each subsequent
operation of the READ key.
ADM-860C 04/14/0811
ENGLISH
This message indicates that the readings will be in English units. Pressing the UNITS key will switch the
meter to metric units. The meter will store the units selection (metric or English) and will automatically start
up in the selected units the next time it is turned on.
ERASE n?
This message is displayed when the operator has pressed the MODE key twice while recalling stored
readings. The current reading displayed in RECALL (nn
s) will be erased when the operator presses the
READ key.
ERASING
This message is displayed when the current reading displayed using RECALL (nn
S) is being erased.
FLO-HOOD
This message will be flashed when the FlowHood mode is selected, or when the meter is first turned on if
the flaps plug is connected.
FLOW ONLY
FLOW ONLY will be displayed if the operator inserts the FlowHood flaps plug while the meter is in a velocity
or differential pressure mode and presses the READ key.
HALT
HALT is displayed when a TREND mode sequence is halted by holding the READ key down. The meter
switches back to the manual reading mode and the last reading displayed is a standard manual reading.
LIGHT OFF
This message indicates that the display back-light has been turned off. Battery time is extended when the
back-light is turned off.
LIGHT ON
This message indicates that the display back-light has been turned on. Battery time is reduced when the
back-light is turned on.
LOCAL DENS
This message indicates that flow or velocity readings will be corrected for local air density. The meter
automatically starts up in the local density mode.
LOCHARGE
This message indicates that the battery cells are nearing the end of their useful charge. The meter will
continue to function normally for about twenty minutes, depending on light use, before recharge is required.
The third character of all displayed readings will become the symbol for an empty battery cell. For example,
FP: 983 will be displayed as FP
983, when meter is registering LOCHARGE.
LS: CORR
This message indicates that the air flow measurement is in liters/sec and will be backpressure compensated.
LS: UNCORR
This message indicates that the air flow measurement is in liters/sec and will not be backpressure
compensated.
MANUAL
This message may be one of the parameters displayed following SHIFT/SHIFT and indicates that individual
readings are being taken. The meter is not being used in the memory mode.
MEM EMPTY
This message indicates that the meter is in STORE mode, but no readings have been saved.
ADM-860C 04/14/0812
METRIC
This message indicates that the readings will be in metric units. Pressing the UNITS key will switch the
meter to English units. The meter will store the units selection (metric or English) and will automatically start
up in the selected units the next time it is turned on.
NEG PITOT
This message indicates an invalid, negative, pitot tube velocity reading. This may result from reversed tube
connections to the meter, or from other conditions described in Section 6.2 PITOT TUBE VELOCITY
MEASUREMENT.
NO FLAPS
This message advises that the flaps plug on the FlowHood has not been connected to the meter for air flow
measurements. The meter senses the position of the flaps through the flaps plug.
NO LIGHT
This message will appear as part of the NO LIGHT/BATTERY/TOO LOW sequence, when the battery charge
is too low to support use of the back-light.
NO LIGHT/BATTERY/TOO LOW
This sequence of messages indicates that the battery charge is low and the back-light may not be used until
the batteries are recharged.
NO PROBE
This message appears when the operator has neglected to install the TemProbe sensor prior to initiating a
temperature measurement. This message is also displayed if the TemProbe or extension cord has been
damaged so as to create an open circuit.
NOT ALLOWD
This message is displayed if the user tries to select STORE mode while in TREND mode.
NP 0
This message is displayed when a stored NEG PITOT reading is accessed using a RCL key.
OPEN FLAPS
This message advises that the operator has attempted to perform a nonbackpressure compensated air flow
measurement at greater than 500 cfm with the flaps closed. The flaps must be opened to proceed.
OVER FLOW
This display advises the operator that the air flow measurement being attempted is beyond the range of the
meter.
OVER PRES
This display advises the operator that the pressure measurement being attempted is beyond the range of
the meter. OVER PRES may also be displayed if internal voltage settings or linearity is out of proper range.
(Contact factory if meter continues to read OVER PRES at inappropriate times).
OVER TEMP
This display advises the operator that the temperature measurement being attempted exceeds the upper
range of the meter.
OVER VEL
This display advises the operator that the velocity measurement being attempted is beyond the range of the
meter. OVER VEL may also be displayed if internal voltage settings are out of proper range. (Contact
factory if meter continues to read OVER VEL at inappropriate times).
ADM-860C 04/14/0813
PITOT TUBE
This signal will be flashed when the pitot tube mode is selected, and also upon each subsequent operation
of the READ key.
PRINT MEM?
This message is displayed when the operator has selected the print mode by pressing the STORE key,
followed by the MODE key. If an appropriate printer is connected to the RS232 jack and the READ key is
pressed, the entire contents of the memory will be downloaded to the printer. This message is also displayed
whiled readings are being downloaded to a computer using HyperTerminal.
PRINTING
This message is displayed when the operator is printing readings from memory by selecting PRINT MEM?
and then pressing the READ key.
PROBE
This message is displayed following SHIFT/SHIFT if the TemProbe is connected.
RATIO ERR
This message advises the operator that the backpressure compensated air flow measurement, which is in
process, is invalid because the numerical ratio of the two parts of the measurement sequence exceeds the
predetermined limits. Normally, this means that the operator has made a procedural error, or that a dynamic
change (such as a changed damper setting) has occurred between the two parts of the backpressure
compensated air flow measurement process.
READING
This message is displayed during differential pressure measurements. It is also displayed during the manual
reading which is taken when a set of TREND readings is halted.
RECHARGE
This message signals that the batteries have reached the end of their useful charge, and must be recharged.
The meter will turn off following the display of RECHARGE.
REPL nn?
This message is displayed when the operator has pressed the MODE key once while recalling stored
readings. This message indicates the current reading displayed using RECALL (nn
S) will be replaced with
a new reading when the operator presses the READ key.
REPLACING
This message is displayed when the current reading displayed using RECALL (nn
S) is being replaced with
a new reading.
SHIFT
This message is displayed when the upper half of the keys are activated by pressing the SHIFT key.
SHUT DOWN
The meter will display SHUT DOWN and turn itself off if the battery charge becomes too low or if the meter
is exposed to temperatures beyond the specified limits.
STD 70
/ F or STD 21.1/ C
This message will be flashed during air flow or velocity measurements performed without the TemProbe.
The resulting flow or velocity value will be calculated using the standard temperature, 70
/ F or 21.1/ C. The
correction for the ambient barometric pressure will still occur.
STORE
This message may be one of the parameters displayed following SHIFT/SHIFT and indicates that the meter
is being used in the STORE mode.
ADM-860C 04/14/0814
STORE FULL
This message indicates that the number of readings in memory has reached the maximum storage capacity
of 100 readings.
STORE MODE
This message is displayed when a key other than READ, STORE or RCL is pressed when readings are in
memory. This message may be displayed when the SHIFT key is pressed to indicate that the meter is in the
STORE mode. The mode may not be changed until the readings in memory are cleared by pressing
SHIFT/CLEAR.
STORE RDY
This message indicates that the meter has been placed in the memory mode, and that readings will be
sequentially stored in memory. This function permits recall of readings using the RCL keys, or of their sum,
average, minimum or maximum by pressing the STORE key at any point.
TEMP
This signal will be flashed when the Temperature mode is selected, and also upon each subsequent
operation of the READ key.
TEMPROBE
This message is displayed to indicate a change in the TemProbe connection status during a STORE
sequence.
TOO HOT or TOO COLD
If the internal temperature of the meter exceeds its operational limits, the meter will display TOO HOT or
TOO COLD and shut down. However, if there are readings in memory, the meter will continue to display
TOO HOT or TOO COLD, and will retain the readings in memory. The meter must be cooled down or
warmed up, as the case may be, before normal operation can resume.
If the meter has displayed OVER RANGE after displaying either TOO HOT or TOO COLD, but has not shut
down, this message indicates that the TemProbe sensor was being exposed to temperature levels beyond
the proper operating range. If TOO HOT/OVER RANGE has been displayed, but the meter has not shut
down, the TemProbe sensor may be short circuited.
TOO LOW
This message indicates that the battery charge is very low and the back-light may not be used until the
batteries have been recharged (NO LIGHT/BATTERY/TOO LOW).
TREND RDY
This message is displayed when the meter has been placed in the TREND mode. TREND readings are not
certified for accuracy.
UNDER TEMP
This display advises the operator that the temperature measurement being attempted exceeds the lower
range of the meter.
UNITS - XX
This message will be displayed to indicate the units in which readings are being stored. It is also one of the
parameters displayed after SHIFT/SHIFT is pressed.
VELGRID
This signal will be flashed when the VelGrid mode is selected, and also upon each subsequent operation of
the READ key.
ADM-860C 04/14/0815
5.0 USING THE AIRDATA MULTIMETER
5.1 GENERAL USE
The ADM-860C keypad has eight keys, two of which are dual-purpose keys. The dual-purpose keys are
OFF/ON and CLEAR/STORE. The functions shown in the lower, dark colored section of these keys may be
activated by pressing the desired key. The functions in the upper, silver colored sections of the keys are
accessed by first pressing the SHIFT key, then the key of the desired function.
Press the ON key to turn the meter on. The meter will display a row of pixel blocks to test the display, and will
then display AUTO ZERO while performing a brief internal calibration test.
The MODE key may be pressed repeatedly to select one of the following measurement modes: temperature,
VelGrid velocity, AirFoil probe velocity, pitot tube velocity, differential pressure, absolute pressure. Selecting
the FlowHood air flow mode is discussed in the next paragraph. When a mode is selected, the meter will briefly
display the mode, followed by a two-letter symbol for the units to be used, and then display READ. For
example, if the mode selected is pitot tube, the message would read PITOTUBE briefly, followed by FP: READ.
If the FlowHood flaps plug has been plugged into the meter, the meter will initialize in the FlowHood
measurement mode, and will display FLO-HOOD briefly, followed by CF: READ. Press the Mode key
repeatedly while the flaps plug is connected to cycle the meter through the only measurement modes which are
appropriate when the meter is used on the FlowHood assembly. These modes are temperature, absolute
pressure and air flow.
Press the READ key to take a reading in the selected mode. The meter will briefly display the selected function
again, followed by the measurement result. Pressing the READ key again will trigger another measurement,
which will clear all previous data from the display and display the new result.
The display has a back-light for use in low-light conditions. The back-light may be turned on or off by pressing
the ON/OFF key while the meter is turned on. The display will read LIGHT ON or LIGHT OFF as appropriate.
The third character (colon) in each READ display is replaced by a schematic light symbol (
') when the light is
on.
Note that using the back-light significantly increases the drain on the batteries and reduces operating time
(continuous reading operation) by about 50 percent. The back-light may not be turned on when the battery
charge is very low. The display will read NO LIGHT/BATTERY/TOO LOW.
The back-light will turn off automatically if the meter has not been used for several minutes. Press any key to
turn the light back on.
The meter is turned off manually by pressing the SHIFT key, and then pressing the OFF key. The meter will
turn itself OFF automatically to save battery power if the meter has not been used for several minutes, unless
there are stored readings in memory or the meter is in TREND mode.
The meter saves any readings stored in memory, the measurement mode (pitot tube or differential pressure,
for example) and the type of units (English or metric) during a normal shut-down, and will default to the stored
settings when turned on again. The last reading stored in memory will be displayed.
Information stored in memory will be saved in blocks of 50 readings if the meter must be reset while readings
are in memory. If the meter was turned off, then on again, while readings were in memory, but prior to resetting
the meter, all readings saved prior to turning the meter off will remain in memory after the meter is reset.
The AA-NICAD batteries supplied with the meter are capable of supplying power for more than 3000 readings
after one 10-hour charging period. When the batteries are nearing the end of their useful charge, the meter will
display LOCHARGE and the symbol of a discharged battery cell will appear in the third block of the displayed
reading. The meter will not display LOCHARGE again, but the symbol for the empty battery cell will remain on
the display. Battery charge may be conserved by keeping the back-light turned off and turning the meter off
between reading sessions.
ADM-860C 04/14/0816
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