Analytical-industries GPR-1800 IS ATEX Trace PPM Oxygen Transmitter Manuel d'utilisateur télécharger pdf (Page 18)

Advanced Instruments, Inc

Hazardous Area Installation:

The GPR-1800 IS may be installed in a hazardous area with proper insulation of the incoming power, see

Appendix A. A 12-24 VDC power supply with two (2) conductor shielded cable is recommended. The power

cable to the Ex enclosure must be supplied through a conduit approved for use in hazardous area. Secure

the two wires to the power input terminal block by using the two integral screws of the terminal block. Do not

substitute terminal screws.

Output Connection: The 4-20mA current output is measured in the power loop by

connecting a current measuring device between the negative terminal of the power source and the negative

terminal, marked (-), of the power input terminal block located in the Ex enclosure. The current flow is from

positive terminal of the power source to the positive terminal of the transmitter and back to the negative

terminal of the power source.

To measure the 4-20 mA signal output, connect an ammeter, as illustrated below. To convert the 4-20 mA

in to 1-5 VDC, place a 250 Ohms resister in place of the current meter and measure the voltage across the

resister.

Fuse 100 mA

Power 12-24 VDC

4-20 mA Measuring Device Transmitter

Caution: To prevent accidental damage to the analyzer, it is highly recommended that the user

supply an additional Fuse rated at 100 mA at 30 VDC (see illustration above).

Procedure:

Power requirements consist of a two wire shielded cable and a 12-24V DC power supply.

Unscrew the cone shaped cover from the lower enclosure.

Separate the shielding from the wires of the cable.

Ensure the positive and negative terminals of the power supply are connected to the appropriate terminals of

the terminal block as marked.

Connect the shielding of the cable to the ground screw inside the enclosure.

Replace the cover.

Note: The male and female power terminals snap together, making it difficult to detach them when

connecting the shield to the ground. However, after connecting the shield, ensure that the male terminal is

fully inserted and secured into the female terminal block.

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Analytical-industries GPR-1800 IS ATEX Trace PPM Oxygen Transmitter Manuel d'utilisateur Page 18