Programming Site Data 2-11
September 2004
Entering the Zero Cutoff
Value [CHx-I/O Menu]
Near a zero flow rate, the AT868 readings may fluctuate due to small
offsets caused by thermal drift or similar factors. To force a zero
display reading when there is minimal flow, enter a zero cutoff value
as described below (see Figure A-1 on page A-1):
1. Press
[ESC], [ENTER], [ESC] in sequence to enter the user program.
2. Press [
X] until PROG appears and press [ENTER].
3. Press [
X] until the desired channel appears. Press [ENTER] at CH1
or
CH2.
4. Press [
X] until I/O appears and press [ENTER].
5. Enter a value from 0 to 1 ft/sec (0 to 0.30 m/sec) for the zero
cutoff by using the arrow keys. The recommended setting is 0.1
ft/sec (0.03 m/sec). Press [
W] and [X] to move the cursor to the
desired location and press
[S] and [T] to increase or decrease
the number. Then press
[ENTER].
Activating Mass Flow Use this option to calculate mass flow from a static fluid density.
Complete the following steps (see Figure A-3 on page A-3) to enter
the static density of the fluid:
1. Press
[ESC], [ENTER], [ESC] in sequence to enter the user program.
2. Press [
X] until PROG appears and press [ENTER].
3. Press [
X] until the desired channel appears. Press [ENTER] at CH1
or
CH2.
4. Press [
X] until SETUP appears and press [ENTER].
5. Press [
X] until ADVAN appears and press [ENTER].
6. Press [
X] until MASS appears and press [ENTER].
7. Press [
X] to activate or deactivate mass flow (mass flow is
calculated from a static density) and press
[ENTER].
8. If you have activated mass flow, enter the fluid density by using
the arrow keys. Press [
W] and [X] to move the cursor to the
desired location and press
[S] and [T] to increase or decrease
the number. Then press
[ENTER].
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