ADM-870C 07/14/0917
normally shown following the units for a displayed reading will be replaced by a symbol for an empty battery cell. The user
will have 5 to 10 minutes of runtime before the meter displays RECHARGE/SHUT DOWN and turns itself off. The batteries
must be recharged prior to further use. See Section 2.0 SPECIFICATIONS and APPENDIX C for more information about
the batteries and the battery charger.
The battery status and reading selections in effect can always be viewed by pressing SHIFT/SHIFT. The first display
represents the approximate level of charge remaining in the batteries. 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. The meter
will then display the measurement mode (for instance, VelGrid) and the units selected (English or metric). If the temperature
probe is not being used during flow or velocity readings, the standard temperature (STD 70
/ F or STD 21.1/ C) will be
displayed. 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.
The associated function (ASSOC key) allows the user to view the differential pressure, absolute pressure and temperature
associated with a pitot tube velocity reading. The absolute pressure and temperature associated with an AirFoil probe,
VelGrid or air flow reading may also be viewed. While the reading is being displayed, press ASSOC repeatedly. The meter
will display, in sequence, the temperature used for air density adjustment (if NO PROBE, the standard temperature will be
used), the barometric pressure for air density adjustment, and, for pitot tube mode only, the differential pressure measured
across the input ports.
5.2 AUTOMATIC READINGS
Automatic sequential readings are initiated by first selecting the function and units keys required, then pressing the SHIFT
key and the AUTO key. The meter will display AUTO READY. Pressing the READ key starts the actual measurement
process. The automatic reading sequence may be interrupted by holding the READ key down. Release the READ key
when HALT is displayed. The automatic reading sequence will be resumed if the READ key is pressed again. The automatic
reading function may be exited while in HALT by pressing the SHIFT key, followed by the CLEAR key.
5.3 TREND READINGS
TREND mode displays a continuous series of readings about once per second. TREND mode is ideal for closely tracking
a changing environment, such as when damper settings are being changed. TREND displays a continuous series of
readings as the air velocity or flow being adjusted approaches the set point.
TREND mode sequential readings are optimized for speed, not accuracy. When the air has stabilized near the required
setting, the meter can be switched to the MANUAL reading mode for more accurate readings.
TREND mode is selected by pressing SHIFT/AUTO and then SHIFT/AUTO again. Press and hold down READ until the
meter displays HALT to halt the TREND reading mode. The meter will switch back to manual reading mode and the last
reading displayed will be a standard manual reading.
5.4 MEMORY/AVERAGE/TOTAL FUNCTION
The memory/average/total function may be used with any of the measurement modes and allows the storage of up to 200
individual readings for later recall of each reading, the average and sum of the readings, and the minimum and maximum
readings. This capacity may be used to facilitate such tasks as pitot tube duct traverses, VelGrid face velocity
measurements, and the recording of outlet readings. These functions also assist in the averaging of coil face velocities and
temperatures, static pressures, and pressure drop readings.
The STORE key is used only with the memory related functions and serves several purposes. Pressing the STORE key
places the meter in the memory function. Press the STORE key after readings have been entered into memory to
alternately display the average, the sum, the minimum and the maximum reading. The memory is cleared by pressing the
SHIFT key and then the CLEAR key.
The meter stores individual readings with greater resolution than the rounded figures that are displayed. These numbers
are used to calculate the sum and average. Therefore, there may be a very small difference between the sum and average
calculated by the meter and a sum and average calculated by the user from the individual readings.
5.4.1 MEMORY OPERATION
Press the MODE key. The meter will flash the selected function followed by a READ prompt. Press the STORE key. The
meter will display STORE RDY and is now ready to store a sequence of readings. Press the READ key to take a reading.
The meter will display the mode, and then the units, prior to displaying the first reading. If readings are being taken in flow
or velocity, either LOCAL DENS or STD DENS will also be displayed. If the TemProbe is not in place during flow or velocity
measurements, the meter will display STD 70
/ F or STD 21.1/ C prior to the display of the first reading. Readings will be
To Next Page
Loading...
Need help?
General
