Dwyer MTL7787 - Manual (Page 6)

2 INM7700-6 Jan 2010
2.3 MTL7700 Series – accessories
MTL7700 Series barriers mount directly onto DIN-rail. A
comprehensive selection of mounting, tagging, power and earthing
accessories is available. Installation details are given in section 4.3.
Essential accessories
The following are usually considered essential for mounting and
earthing MTL7700 Series barriers:
DIN-rail (eg, THR2 or THR7000)
Insulating spacers (eg, ISP7000)
Earth terminal (eg, ETL7000)
The tagging systems for individual modules and columns of barriers
are described here. They are shown below under Tagging
accessories for columns of barriers.
Mounting accessories (figure 2)
THR2 Standard DIN-rail, 35 x 7.5mm, (in 1m lengths)
THR7000 Nickel-plated DIN-rail, 35 x 7.5mm, for use in
potentially corrosive atmospheres (in 1m lengths)
ISP7000 Insulating spacer: attaches to the base of a DIN-
rail to isolate the IS earth from a structural earth
Tagging accessories for individual barriers (figure 2)
TH7700 Tag holder for mounting on the top of an
individual barrier
Tagging accessories for columns of barriers (figure 2)
TAG57 Tagging strips for mounting over a column of
barriers, for marking barrier locations. Supplied
(with labels) in 1m lengths for cutting to size.
TGL7700 Spare labels for use with TAG57 tagging strips:
0.5m strips, supplied in sets of 10.
IMB57 Tagging strip supports. Two needed for each
tagging strip. It can also be used as centre
support by breaking off the top end tab.
Power accessories (figure 3)
BPL7700 Power link for feeding 24V dc to a maximum of
40 barriers in a single column from an MTL7798
power feed module or MTL7799 Dummy
module.
Earthing accessories (figure 3)
ETL7000 Earth terminal providing connections for
routeing the IS earth from the DIN-rail to an
appropriate plant earth. Two recommended for
each length of DIN-rail.
TAG57
TGL7700
ERB57O
IMB57
ETL7000
ISP7000
TH7700
Figure 2: MTL7700 Series mounting and tagging accessories
Table 1: MTL7700 Series Key barriers
Type Application Key barriers
MTL
Analogue Resistance temperature detectors 7755ac
input Thermocouples, ac sensors 7756ac
(low-level) 7760ac
Analogue Controller outputs, one line earthed 7728+
output Controller outputs, neither line earthed 7787+
dc power supply
26V 20-35V
Analogue Transmitters, 2-wire, 4–20mA 7787+ 7706
input
(high-level)
Digital Switches 7787+ 7707+
(on/off) 7741-44
input
Digital Solenoids, alarms, LEDs 7728+ 7707+
(on/off)
output