RKI Instruments GD-K7D2 (24 VDC) - Manual (Page 11)

Model GD-K7D2 (24 VDC) Sample Draw Transmitter • 7
Installation
This section describes how to install the GD-K7D2 at the monitoring site. This section
includes procedures to disassemble the GD-K7D2, mount the GD-K7D2, connect sample
lines to the GD-K7D2, and wire the GD-K7D2 to a controller.
Disassembling the GD-K7D2
1. Loosen the thumbscrew on the front of the housing cover, then remove the cover from
the detection unit and installation bracket.
2. Loosen the captive screw in the lower left front of the detection unit that secures it to
the installation bracket.
3. Pull the detection unit away from the installation bracket until the main board
disengages from the socket, then lift it up slightly to free the detection unit from the
installation bracket.
Mounting the GD-K7D2
CAUTION: The GD-K7D2 is suitable for installation in indoor areas where general purpose
equipment is in use.
1. Select a mounting site that is representative of the monitoring environment. Consider
the following when you select the mounting site.
• Select a site that is easily accessible for servicing.
• Select a site where the GD-K7D2 is not likely to be bumped or disturbed. Make
sure there is sufficient room to make wiring and sample line connections at the
bottom of the GD-K7D2. Also make sure there is sufficient room to perform
start-up, maintenance, and calibration procedures.
• Select a site near the sampling area. The GD-K7D2 is designed to detect a variety
of toxic gases many of which are easily absorbed in sample tubing. See Table 2
below for recommended sample tubing lengths for various gases when using
Teflon PTFE sample tubing. Contact RKI Instruments, Inc. for gases not listed.
2. Use three #10 screws through the three mounting holes in the installation bracket to
mount the installation bracket to a vertical surface. One of the mounting holes is
round and the other two are slotted (See Figure 5).
Table 2: Maximum Sample Tubing Lengths For Various Gases
Target Gas
Maximum Sample
Tubing Length
BF
3
(HF), ClF
3
, ClO
2
, F
2
, HF, O
3
, POCl
3
(HCl), WF
6
, TaF
5
(HF) 5 meters
BCl
3
(HCl), BR
2
, HBr, HCl, F
2
, NO, NO
2
, PCl
3
(HCl), POCl
3
,
SbCl
5
(HCl), SiH
2
Cl
2
(HCl), SnCl
4
(HCl), SiCl
4
(HCl), SO
2
, TiCl
4
(HCl)
10 meters
Cl
2
, Si
2
H
6
20 meters
AsH
3
, B
2
H
6
, CO, H2S, NH3, PH
3
, SiH
4
30 meters
Note: Gas in parenthesis indicates breakdown product of target gas being detected.