Emerson 381 instruction manual Section Installation

MODEL 381pH/ORP	SECTION 2.0
	INSTALLATION

SECTION 2.0

INSTALLATION

2.1INSTALLATION. Prepare the sensor for installation as follows (see Figure 2-1):

1.Remove the cover from the body by grasping the body and rotating the cover 1/4 turn counter- clockwise.

2.When the cover breaks loose from the body, pull the cover straight out.

3.Lubricate the seals of the glass electrode with O- ring lubricant, Rosemount Analytical P/N 2001928, and install the glass electrode in the body. Tighten the electrode nut by hand. DO NOT use tools.

CAUTION

Do not get lubricant on amber tip of glass electrode. It will disrupt the electrical circuit path.

4.Make sure the double junction electrode is thread- ed tightly.

5.Plug the preamplifier (or remote connector) onto the T.C. and reference electrode pins.

6.Connect the BNC connector from the glass elec- trode to the preamplifier.

7.Install the body O-rings. Make sure they are clean, and not twisted. Make sure the covers mating sur- faces faces are clean.

NOTE

Both body O-rings must be installed and lubricated to ensure a water tight seal. Failure to seal the body properly will result in water damage, in insertion applications.

8.Lubricate the body O-rings with O-ring lubricant, P/N 2001928.

9.Plug the cable connector to the preamplifier, mak- ing sure the cable is toward the center of the body.

10.Install the cover on the body so that the threads will engage.

11.Rotate the cover until the triangle on the body aligns with (or falls within) the adjacent mark on the cover.

IMPORTANT!

12.While holding the sensor in an up side down posi- tion (see Figure 2-1), remove the 1/4 inch plug from the electrode tip end of the sensor.

13.Install the liquid junction in place of the 1/4 inch plug, using Teflon tape on the liquid junction threads.

CAUTION

DO NOT use pipe joint compound or pipe dope on the threads of the liquid junction. The electrical circuit will be disrupted if the liquid junction is contaminated.

2.2SUBMERSION INSTALLATION (Code 02). To install the sensor in process proceed as follows (see Figure 2-2):

1.Wrap Teflon tape on 3/4 inch MNPT threads of cover and on standpipe threads. Seal must be water tight. Cable gland is not waterproof. Do not allow water to accumulate in the stand pipe.

CAUTION

Do not use a pipe wrench on the plastic parts. Severe damage could result.

2.Attach a 3/14 inch coupling to the sensor.

3.Attach electrode shroud to 2 inch MNPT.

4.Feed cable through the rigid standpipe.

5.Attach the rigid standpipe to 1 inch coupling.

CAUTION

Rigid stand pipe must be water-tight; cable seal is not waterproof.

6.Tighten all fittings and secure the standpipe to minimize sensor movement. Use flexible conduit at the top of the rigid standpipe to permit removal of the sensor for periodic maintenance.

7.Refer to Section 2.6 and wire the sensor to the transmitter as described.

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