Kobold MAS Series, Instruction Manual

Page: 15 / 54

MAS Instruction Manual
Page 14
2.5.3
OEM Electrical
Connections
2.5.4
Using Kobold’s Single,
Dual, and Flo-Box™
Electronics
The OEM version MAS flowmeter has an electrical port (hole) on
its side for electrical input/outputs. This port is just above the
input power jack (see Figure 2-2). Wires entering the MAS via this
port are soldered to the printed circuit board as shown in Figure 2-
3. The solder pad assignments are given in Table 2-1.
How to Gain Access to the MAS’s Printed Circuit Board (PCB):
To gain access to the PCB to make the solder connections, please
refer to the exploded view in Appendix A and follow these simple
steps.
1. If your MAS has the digital display:
(a) First, remove the display by carefully rotating the display
until it hits the top plate. Slowly continue to rotate until this
lever arm action snaps out the two yokes holding the display
(Nos. 30). Use extra caution during this operation as excessive
force will break the delicate wire connections. Carefully move
the display assembly to expose the two screws securing the
display base (No. 35). Do not exert excessive force on the display
while rotating as doing so could crack the LCD display.
(b) Next, remove the two screws (Nos. 21) in the display base
(No. 35) and the two screws (also Nos. 21) in the back of the
enclosure (No. 10).
(c) The top, front, and back sides of the enclosure can now be
removed, (the front slides out towards you and perpendicular to
the flow path) exposing the PCB.
2. If your MAS does not have the digital display:
(a) Remove the label (No. 29) from the plain top cover (No. 28)
to expose the two screws (Nos. 21).
(b) Then follow steps 1(b) and 1(c) above.
To reassemble, just reverse the process.
For applications requiring flow totalization or alarms simply
order the optional Model EC-( ) cable to connect to the rear panel
of Kobold Instruments’ Single-Channel, Dual-Channel, or Flo-
Box (1-5 Channels) Electronics. The Kobold electronics will provide
you with a selectable digital readout for each channel, input power,
high, low, or window alarms, and optional flow totalization.