Installation guide

Quick Installation Guide

00825-0100-4825, Rev DB

February 2011

Rosemount 248

Rail Mount Transmitter with Threaded Sensor

The least complicated assembly uses:

• a threaded sensor with flying heads

• a threaded sensor connection head

• a union and nipple extension assembly

• a threaded thermowell

Refer to Volume 1 of the Rosemount Sensors Product Data Sheet (document number

00813-0100-2654) for complete sensor and mounting accessory information.

To complete the assembly, follow the procedure described below.

1. Attach the transmitter to a suitable rail or panel.

2. Attach the thermowell to the pipe or process container wall. Install and tighten the

thermowell before applying pressure.

3. Attach necessary extension nipples and adaptors. Seal the nipple and adapter threads

with silicone tape.

4. Screw the sensor into the thermowell. Install drain seals if required for severe

environments or to satisfy code requirements.

5. Screw the connection head to the sensor.

6. Attach the sensor lead wires to the connection head terminals.

7. Attach additional sensor lead wires from the connection head to the transmitter.

8. Attach and tighten the connection head cover. Enclosure covers must be fully engaged

to meet explosion-proof requirements.

9. Attach the sensor and power leads to the transmitter. Avoid contact with leads and

terminals.

Integral Mount Sensor with

Terminal Block

Connection Head

Standard Extension

Threaded Thermowell

Rail Mount Transmitter

Sensor Leads with

Cable Gland

00825-0100-4825.fm Page 8 Friday, February 18, 2011 11:49 AM