Detcon FP-524D-HRT Manual de usuario descargar pdf (Pagina 13)

Model FP-524D-HRT

FP-524D-HRT Instruction Manual Rev. 0.1 Page 9 of 48

NOTE:

Any unused ports should be blocked with suitable ¾” male NPT plugs. Detcon

supplies one ¾” NPT male plug with each J-box enclosure. If connections are other than ¾”

NPT, use an appropriate male plug of like construction material.

2.6 Field Wiring

Detcon Model FP-524D-HRT combustible gas sensor assemblies require three conductor connections between

power supplies and host electronic controller’s 4-20mA / HART interface. A 250 ohm load resistor is needed

on the 4-20 mA line when it is not being used. Wiring designations are DC+, DC-, and MA (sensor signal).

The maximum wire length between sensor and 24VDC source is shown in the Table below. The maximum

wire size for termination in the Junction Box is 14 AWG.

Table 1 Wire Gauge vs. Distance

AWG Wire Dia. Meters Feet

Over

Current

Protection

0.723mm

700

2080

0.812mm

1120

3350

1.024mm

1750

5250

1.291mm

2800

8400

10A

1.628mm

4480

13,440

20A

NOTE 1:

Wiring table is based on stranded tinned copper wire and is designed to serve as a

reference only.

NOTE 2:

Shielded cable is required for installations where cable

trays or conduit runs include

high voltage lines or other possible sources of induced interference. Separate conduit runs are

highly recommended in these cases.

NOTE 3:

The supply of power should be from an isolated source with over

current protection

as stipulated in table.

NOTE 4:

A 250 ohm load resistor is needed on the 4

20 mA line when it is not being used.

Terminal Connections

CAUTION: Do not apply system power to the sensor until all wiring is properly terminated. Refer to

Section 2.7 Initial Start Up.

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