Emerson Process Management 2400S manual 8.2.2Using a DeviceNet tool, 8.3Configuring cutoffs

Optional Configuration

5.Click Next.

6.Verify the reference temperature and reference pressure. If these are not appropriate for your application, click the Change Reference Conditions button and enter new values for reference temperature and reference pressure.

7.Click Next. The calculated standard density value is displayed.

•If the value is correct, click Finish. The value will be written to transmitter configuration.

•If the value is not correct, click Back and modify input values as required.

Note: The Gas Wizard displays density, temperature, and pressure in the configured units. If required, you can configure the transmitter to use different units. See Section 6.3.

8.2.2Using a DeviceNet tool

The Gas Standard Volume Object is used to configure volume flow measurement for gas. See the flowchart in Figure 8-1.

Figure 8-1Gas standard volume flow measurement – DeviceNet tool

Enable gas standard

volume flow

measurement

Set unit

Class: Gas Standard Volume Object (0x64)

Instance: 1

Attribute ID: 7

Data type: BOOL Value:

•0 = disabled (and liquid volume flow enabled)

•1 = enabled (and liquid volume flow disabled) Service: Set

Class: Gas Standard Volume Object (0x64)

Instance: 1

Attribute ID: 5

Data type: UINT

Value: See Table 6-4

Service: Set

Set cutoff(1)

Set reference density

of gas(2)

Class: Gas Standard Volume Object (0x64)

Instance: 1

Attribute ID: 8

Data type: REAL

Service: Set

Class: Gas Standard Volume Object (0x64)

Instance: 1

Attribute ID: 4

Data type: REAL

Service: Set

(1)See Section 8.3.

(2)The Gas Wizard is provided only with ProLink II. If you are not using ProLink II, you must supply the required reference density.

8.3Configuring cutoffs

Cutoffs are user-defined values below which the transmitter reports a value of zero for the specified process variable. Cutoffs can be set for mass flow, liquid volume flow, gas standard volume flow, and density.

See Table 8-2for cutoff default values and related information. See Section 8.3.1 for information on how the cutoffs interact with other transmitter measurements.

58 Micro Motion® Model 2400S Transmitters for DeviceNet™