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Condec UPS3210 User Manual

Page 30

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UPS3000/UPS3110/UPS3210 Operation and Maintenance Manual

3.7.2

For UPS3110 Absolute/Gage Switch Selectable Units ONLY

If the current barometric pressure is below 14.7 PSIA, the offset is positive, see Example 1. If the current
barometric pressure is above 14.7 PSIA, the offset is negative, see Example 2. If the current barometric pressure
is 14.7 PSIA, then no offset is needed.

Example 1:

If the current barometric pressure is lower than 14.70 PSIA, subtract the current barometric pressure from 14.70.

14.70 PSI: UPS3110 reference point

-14.55 PSI: Current barometric pressure

0.15 PSI: Positive Delta Offset

Complete the following steps (refer to Figure 2-2 on page 5 and Figure 2-5 on page 7):

1. Open the

VENT

valve (12) and close the

INPUT

(10) valve.

2. Using the

RANGE SELECT

switch (6), select the lowest pressure range on the UPS3110.

3. Press the

ENTER

push-button, as shown in Figure 3-2 on page 20, on the UPS3110. The display reads

zero. Repeat this step for the middle and high ranges.

4. Close the

VENT

valve (12). Select the lowest pressure range of the UPS3110.

5. Turn the

VERNIER

(11) of the UPS3110 clockwise, creating a pressure until the display reads the value of

the Positive Delta Pressure, 0.15 PSI as in this example.

6. Depress the

ENTER

push-button on the UPS3110. The display reads zero. Without touching the

VERNIER

(11) knob repeat this step for the middle and high ranges.

7. Using the

STEPPER

push-button, as shown in Figure 3-2 on page 20, place the unit into

SHUNT RESISTOR

CALIBRATION

mode. The display will be as shown in Figure 3-5 on page 23.

8. With UPS3110

RANGE SELECT

switch (6) switched in the high range, depress the

ZERO

push-button on

the front panel. Verify that the display reads 0.00. Upon release of the push-button the display will be as
shown in Figure 3-5 on page 23.

9. Depress the

ENTER

push-button. The display will respond with

“[] [] [] [] [] []”

until the button is

released.

10. Pressing the

STEPPER

push-button bring the indicator back to its initial Data Recall display condition as

shown in Figure 3-2 on page 20. The display shows

1 XXX

(three arbitrary digits).

11. Depress the

DATA ENTER

switch, S2, located approximately in the middle of the circuit board. See Figure

2-7 for the switch location

12. If the data is accepted, the three-digit number on the right side of the display will indicate

377

for as long

as the

DATA ENTER

switch, S2, is depressed.

13. The barometric offset is now complete and

CALIBRATE/OPERATE

switch, S3, must be returned to its

normal operating positions as shown in Table 3-1 on page 20.

Example 2:

If the current barometric pressure is above 14.70 PSIA, subtract the current barometric pressure from 14.70.
14.70 PSI: UPS3110 reference point

-14.75 PSI: Current barometric pressure

-.05 PSI: Negative Delta Offset

NOTE:

Normally the negative offset is small enough to prevent the need of a vacuum pump.

Complete the following steps (refer to Figure 2-2 on page 5 and Figure 2-5 on page 7):

1. Open the

VENT

valve (12) and close the

INPUT

(10) valve.

2. Using the

RANGE SELECT

switch (6), select the lowest pressure range on the UPS3110.

3. Press the

ENTER

push-button, as shown in Figure 3-2 on page 20, on the UPS3110. The display reads

zero. Repeat this step for the middle and high ranges.

4. Close the

VENT

valve (12). Select the lowest pressure range of the UPS3110.

5. Turn the

VERNIER

(11) of the UPS3110 counter-clockwise, creating a vacuum until the display reads the

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