Zephyr B Bedienungsanleitung PDF herunterladen (Seite 3)

Honeywell Sensing and Control 3

Honeywell Zephyr

Digital Aiﬂow Sensors

HAF Series–High Accuracy, 10 SLPM, 15 SLPM,

20 SLPM, 50 SLPM, 100 SLPM, 200 SLPM or 300 SLPM

Rev. B

50080060

Figure 1. Accuracy and Total Error Band

10 SLPM, 15 SLPM, 20 SLPM, 50 SLPM, 100 SLPM,

200 SLPM

300 SLPM only

Error (%FS)

%FS

100

Ideal

Accuracy

0 %FS to 14.3 %FS = 0.5%

14.3 %FS to 100 %FS = 3.5%

20 50 90700

4.00%

3.00%

2.00%

1.00%

-1.00%

-2.00%

-3.00%

-4.00%

40 60

Total Error Band

0 %FS to 12.5 %FS = 0.5%

12.5 %FS to 100 %FS = 4%

Error (%FS)

%FS

100

Ideal

Accuracy

0 %FS to 14.3 %FS (0 SLPM to 43 SLPM) = 0.5%

14.6 %FS to 100 %FS (44 SLPM to 300 SLPM) = 3.5%

4.00%

3.00%

2.00%

1.00%

-1.00%

-2.00%

-3.00%

-4.00%

Total Error Band

0 %FS to 14.3 %FS (0 SLPM to 43 SLPM) = 0.5%

14.6 %FS to 66.3 %FS (44 SLPM to 199 SLPM) = 4% reading

66.6 %FS to 100 %FS (200 SLPM to 300 SLPM) = 7% reading

-5.00%

-6.00%

-7.00%

-8.00%

5.00%

6.00%

7.00%

8.00%

TEB = 0.5%

at 43 SLPM

TEB =

65%

at 199 SLPM

TEB

= 4. 67

at 200

SLPM

TEB = 7.00%

at 300 SLPM

Digital Interface

For additional details on the use of Zephyr with digital output see the Technical Note “I2C Communications with Honeywell Digital

Airflow Sensors”.

The sensor uses the I

C standard for digital communication with a slave address specified in the Nomenclature and Order Guide in

Figure 2. Following sensor power-up, each of the first two read sequences shown in Figure 7 will respond with 2 bytes of the unique

4-byte Serial Number. The first read after power-up will respond with the two most significant bytes of the Serial Number, while the

second read will respond with the two least significant bytes of the Serial Number. For reliable performance, allow sensor to be pow-

ered for the sensor startup time before performing the first read, then allow a 10 ms command response time before performing the

second read.

Table 7. Ideal Transfer Function

Item Equation

Digital Output Code 16384 * [0.1 + 0.8 * (Flow Applied/Full Scale Flow)]

Flow Applied Full Scale Flow * [(Digital Output Code/16384) - 0.1]/0.8

1 2 3 4 5 6 7

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