GREISINGER GVA 0430 (01) PDF MANUAL

To measure air velocity for a single point:

1. Press the ON/OFF button and turn meter on. Meter will show full display when first powered on.

2. Unit is ready for use when LCD display shows “vel” in upper left corner and temperature in lower right corner (Fig. 1).

3. Hold sensor in front at air source; instrument will display feet per minute readings (FPM).

To display a continuous moving average for up to two (2) hours:

1. Power unit ON.

2. Place sensor in front of air flow source.

3. Press MIN/MAX record key and unit will begin to display moving average. Meter will record the reading every second.

To obtain MIN/MAX/AVG readings on a single point:

1. Power unit ON.

2. Place sensor in front of air flow source.

3. Press MIN/MAX record key. The unit will begin to record readings.

4. Press HOLD prior to moving instrument away from air flow source to store readings.

A. Press MIN/MAX key once to display AVG velocity readings.

B. Press MIN/MAX key again to display MIN velocity readings.

C. Press MIN/MAX key again to display MAX velocity readings.

D. Press MIN/MAX key again to display current velocity.

5. Press ON/OFF RESET to clear the current MIN/MAX average readings.

Air velocity measurement is calculated by multiplying the air velocity readings times the free area dimension. Free area is published by the grill and register manufacturer you are servicing.

To determine the free area of the air source you are measuring and enter into meter:

1. Power unit ON.

2. Press mode select once (you will hear one beep). Meter will display “AREA” in upper case and “1.111” with a flashing digit. (Fig. 2) This is the free area default setting.

3. To increase numbers the flashing digit can be changed by pressing HOLD/ADVANCE key.

4. To change value of other digits press NEXT DIGIT key.

5. Press the Record key to stop the flashing and save the change. The meter is now ready to measure air flow (CFM).

Repeat steps 1-4 in section B (continuous moving average instructions) to obtain MIN/MAX/AVG CFM readings from a single point.

To obtain air velocity average for multiple points:

1. Turn the meter on and position the fan at the first point to be measured. As soon as the first measurement is completed press the HOLD key (you will hear a single beep) and release. The display will show a HOLD above the reading (Fig. 3.). The reading is now being held.

2. Press MIN/MAX RECORD key (You will hear a single beep) and release (the display will show a digit 1-8). This number represents the point that is being recorded (Fig. 4).

Repeat this process until all desired points have been measured and recorded.

3. Once all measurements have been recorded press NEXT DIGIT/MULTIPOINT AVERAGE key. The unit will display the average air velocity reading and number of points measured (Fig. 5).

Unit can record a total of 8 points at one time.

Press and hold NEXT DIGIT/MULTIPOINT AVERAGE key until it beeps twice, then release. Unit must be in velocity/FPM mode in order to clear current average readings.

Simply complete steps 1-3 in D (Direct Measuring Air Flow (Single Point) CFM). Once all the multipoint average is determined:

1. Press MODE button once and confirm correct free area setting is locked into instrument. (If free area setting must be adjusted make necessary changes now. See section C Steps 2-4).

2. If free area setting is correct press MODE button again to enter air flow mode.

3. Unit will now display average air flow reading and number or points measured (Fig. 6).

This meter’s free area dimension has been set to 1.111 square feet, a most commonly used free area dimension in the U.S.A.. If you want to measure the air flow for a single point without changing the area dimension, please power on the meter, position the fan and then press the MOD key twice, you will be into the air flow (CFM) mode and the air flow (CFM) displayed is equate to the current air velocity reading (FPM x FREE AREA = CFM) times the 1.111 square feet.

To bypass auto power off for continuous operation: press ON and HOLD at the same time and then release ON only. An “n” appears on the LCD then you can release the HOLD key. The instrument will remain on until the OFF button is pressed.

The default setting for the measuring unit of air velocity is feet/min and the default setting for the unit of temperature is °F. You can change the measuring units to meter/sec and °C by following these steps:

1. Turn on the meter by pressing ON and AVERAGE key at the same time. Release ON first then Average. The LCD display will show small printing “ft/m” on the right upper corner and a “F” on the right lower corner.

2. Press HOLD key to change the measuring units to metric system and you can press AVERAGE key for imperial measuring units.

3. Press RECORD key to save the unit changes.

1. After you save the unit changes you will see a “S” on the LCD and then a “2400” number on the screen. The 2400 is the default setting of Baud Rate for RS 232 output. You can change the setting to “1200” by pressing HOLD key and change the setting back to “2400” by pressing the AVERAGE key.

2. Please remember to save your changes by pressing the RECORD key. Then the LCD screen will be under the air velocity measuring mode.

The unit will turn off automatically after 20 minutes to save the battery. This will be preceded by 3 beeps. Press the ON button, and the unit will resume operation.

“LOW BATTERY” indicates low battery. Please change your 9 volt battery.

“E6” indicates the probe is disconnected from the instrument body or not connected properly.

RANGES	RESOLUTION	ACCURACY
AIRFLOW
80-4900 ft/min	1	± 2%
0.4-30 m/sec	0.01	± 2%
TEMPERATURE
– 10 °C to 50 °C	0.1	±0.6 °C
+ 14 °F to 122 °F	0.1	±1.0 °F

BATTERY TYPE: 9 volt

BATTERY LIFE: 100 hours (under normal usage)

DISPLAY TYPE: LCD

DISPLAY SIZE: 37 mm x 42 mm (1 1/4″ x 1 5/6″)

MAX READING: 9999

DIMENSIONS: 181 mm x 71 mm x 38 mm (7 1/8″ L x 2 3/4″ W x 1 3/8″ D)

DIAMETER OF FAN: 70 mm (2 7/8″)

RS232 OUTPUT: FORMAT: TXXX XF, VXXXXFTM

TXXX XC, VXXXXMPS

CFM AND CMS READ-OUT

AUTO POWER OFF: 20 minutes (bypass see section G)

DATA HOLD