Compaq MTEK6000 Installing the Thermal Probe, Pipe Size Insertion Thermowell Length Part Number

MTEK6000 SERIES USER'S MANUAL

INSTALLING THE THERMAL PROBE

A thermal (temperature) probe is connected to the MTEK6000 by a 6-foot (2-meter) cable. You should coil excess cable to prevent possible damage. The probe is designed to fit into standard Metretek, Inc. thermowells. Optional 15-foot (4.5 meter) and 30-foot (9-meter) cables are available. See Fig 2-10.

To install the thermal probe, use the supplied temperature probe adapter. Refer to Table

2-1. Insert the probe into the thermowell and tighten the securing nut FINGER TIGHT only. The standard adapter is a ½” fitting. Users retrofitting instruments requiring the 5/8” adapter can order the adapter from Metretek, Inc.

Oil or ethylene glycol (antifreeze) should be used to improve heat transfer from the thermowell to the thermal probe. Be aware, however, that it is possible to cause hydraulic crushing of the probe. This can happen when there is little or no air in the thermowell above the probe. When the probe is fastened by tightening the securing nut, the space in the well decreases as the probe enters. As a result, hydraulic pressure may rise high enough to cause damage. If you use oil or antifreeze, make sure there is enough air in the thermowell above the fluid to prevent crushing the probe.

It is recommended that the thermowell be installed in the meter outlet pipe one or two diameters from the meter outlet. The insertion length of the thermowell must be sufficient to extend at least to the pipe center, but no further than 75% of the pipe’s diameter. Thermowells should not be situated where they will be exposed to direct sunlight. A sunshield should be used for installations where this cannot be avoided.

Figure 2- 8 Temperature Probe Connection

Table 2-1:	Thermowell	Part Numbers
Pipe Size	Insertion	Thermowell
	Length	Part Number
4 in.	2 ½ in.	5340-0373 ½” NPT
		5340-0377 ¾” NPT
		5340-0384 1” NPT
6 in.	4 ½ in.	5340-0372 ½” NPT
8 in.		5340-0376 ¾” NPT
		5340-0383 1” NPT
12 in.	7 ½ in.	5340-0371 ½” NPT
14 in.		5340-0375 ¾” NPT
		5340-0379	1” NPT
16 in.	10 ½ in.	5340-0370	½” NPT
20 in.		5340-0374	¾” NPT
		5340-0378	1” NPT

January 2002 2-9