Alnor- Cnbt Study Guide

Front 1

Alnor EBT720/721 and ProHood PH720/721

Back 1

It's an electronic micromanometer

Front 2

Alnor EBT720/721 and ProHood PH720/721

Features:

Back 2

Auto zero for pressure, auto density correction, back pressure compensation if using flow hood

conversions between actual and standard flow

Discrete or continuous display and data logging

Front 3

Pitot tube used for what?

Back 3

1. air velocity

2. air volume

3. velocity pressure

WITHIN DUCTWORK

Front 4

Static Pressure Probe

Back 4

Primarily to obtain static pressure measurements within ductwork.

Front 5

Velocity Matrix= Velgrid

Front 6

Installing Batteries

Back 6

Know there is a battery selector switch for type of battery

Front 7

Connecting a pitot tube

Back 7

static pressure port is connected to negative pressure port on micromanometer (-), and total pressure port connected to +.

Front 8

Connecting Static Pressure Port

Back 8

Static pressure port connected to + port. Negative remains open to atmosphere.

Front 9

Attaching to Capture Hood

Back 9

1. Align tabs, press until click and clips holds to base.

2. Attach temp cable and back pressure flap swich cable to right side of meter.

Front 10

Matrix standoffs positioned where?

Back 10

Positive side of matrix.

Front 11

Connecting the Airflow Probe

Back 11

+ to +, - to -

Front 12

READ

Back 12

if display mode set to SINGLE, press READ stops automatically when read is done.

if set to RUNAVG, then pressing READ alternates pause/resume.

Red button on hood has same function as READ key.

Front 13

Logging Interval

Back 13

When logging set to CONTIN, then meter will log readings at the frequency.

Front 14

If you select flow for a pitot tube or air flow probe

Back 14

you will need to enter duct shape and size.

Front 15

Entering K-factor

Back 15

"simply multiplied by calculated velocity or flow in order to get the displayed value"

Range from 0.5 to 1.5

Front 16

K-factor mandatory for what?

Back 16

Diffuser Flow Tool (Flow from pPressure and K-factor)

Range 0.001 to 9.999

Front 17

View/Set Standard Pressure and Temperature

Back 17

for Pitot flow/velocity, air Flow flow/velocity, matrix, hood tools then barometric pressure and temp if sensor plugged in is used.

If not plugged in, then you enter them!

Front 18

When is temp/pressure not used?

Back 18

For the Diffuser Flow tool (Flow from Pressure and K-factor)

Front 19

Discrete vs Continuous Logging

Back 19

Discrete= press SAVE to save

Continuous= automatically saves at selected logging interval

Front 20

Taking Back Pressure Compensated Hood Readings

Back 20

1. Open flap

2. Hold hood to diffuser

3. Press READ or red switch

4. Close flap when "CLOSE THE FLAP" is displayed

5. Close flap and press READ

Front 21

Deadband

Back 21

Sets min where zero is displayed. If on, then less than 18 fpm or 18cfm display zero.

Front 22

Calibrate

Back 22

Possible fro pressure, temp and humidity in field. Need to expose to as close as requested calibration condition.

Front 23

Calibration Notes:

Back 23

follows accessory temp/humid probe to different micromanometers.

Calibration for temp robe and hood base temp sensor are stored in micromanometer, and cal will not follow the probe to a different micromanometer.

Front 24

Non back pressure compensated measurements: Where is flap?

Back 24

Open

Front 25

"888888"

Back 25

pressure to high to measure (or velocity)

Front 26

Set of error codes- look at manual if needed!

Front 27

Verifying Flow Measurements

Back 27

Recommended with multi-point, in duct velocity traverses using a Pitot-static tube or a thermal anemometer.

Front 28

Ranges:

DP

Absolute Pressure

Velocity

Volume

Temp

RH

Back 28

DP= +-15 in H20

Absolute Pressure= 15 to 40 in Hg

Velocity= 25 to 8,000 ft/min PITOT, 25 to 5k ai flow probe, 25 to 2,500 matrix

Volume= 25 to 2,500 cfm on capture hood

Temp= -40 to 250

RH= -4 to 160

Front 29

Resolution:

Pressure

Velocity

Volume

Rh

Temp

Back 29

Pressure= 0.00001 in H20

Velocity= 1 ft/min

Volume= 1 cfm

Rh= 0.1%

Temp= 0.1F or 0.1C

Front 30

Accuracy:

Pressure

Velocity

Volume

Rh

Temp

Back 30

Pressure: +- 2% +- 0.001 in H20

Velocity +-3% or +-7 ft/min

Volume +-3% +-7cfm

Rh +-3%

Temp mostly +-5% but sliding scale

Front 31

Response Time

Back 31

2 to 8 seconds