Campbell Scientific CR10 CR10 Measurement and Control - Page 200

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SECTION 14. INSTALLATION AND MAINTENANCE ln other applications it may be desirable to simply switch power to a device without going through a relay. Figure 14.10-2 illustrates a circuit for switching external power to a device without going through a relay. lf the peripheral to be powered draws in excess of 75 mA at room temperature (limit of the 2N2907A medium power transistor), the use of a relay (Figure 14.10-1) would be required. Other control port activated circuits are possible for applications with greater currenVvoltage demands than shown in Figures 14.10-1 and2. For more information contact Campbell Scientif ic's Marketing Department. SUPPLY: MAXIMUM = 40 VDC = MINIMUM REQUIRED CO|L VOLTAGE iniiiny T A \/n^ MAXIMUM CURRENT TO CO|L lS 75 mA AT 25'C, 4o mA Ar -so'c CONTROL PORT CONTROL PORT FIGURE 14.10-1. Relay Driver Circuit with Relay VDC MAXIMUM 2N22224 2N2907A MAXIMUM CURRENT TO PERIPHERAL lS 75 mA AT 25'C. 40 mA AT -50'C PERIPHERAL TO BE POWERED FfGURE 14.10-2. Power Switching without Relay 14-8

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SECTION
14.
INSTALLATION AND
MAINTENANCE
ln other applications it may be desirable
to
simply switch power to
a
device without going
through
a
relay.
Figure
14.10-2 illustrates
a
circuit
for
switching
external
power to a device
without going through
a
relay.
lf
the
peripheral
to
be powered
draws
in excess of
75
mA at
room
temperature
(limit
of
the 2N2907A
medium power transistor),
the
use of
a
relay
(Figure 14.10-1) would
be
required.
Other control port activated circuits are possible
for applications with greater currenVvoltage
demands
than
shown
in
Figures
14.10-1
and2.
For more information contact Campbell
Scientif
ic's Marketing Department.
SUPPLY:
MAXIMUM
=
40
VDC
MINIMUM
=
REQUIRED
CO|L
VOLTAGE
CONTROL
PORT
T
FIGURE
14.10-1.
Relay
Driver Circuit
with
Relay
MAXIMUM CURRENT
TO
A
\/n^
CO|L
lS
75
mA
AT
25'C,
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4o
mA
Ar
-so'c
VDC
MAXIMUM
MAXIMUM
CURRENT
TO
PERIPHERAL
lS
75
mA
AT
25'C.
40
mA
AT
-50'C
CONTROL
PORT
FfGURE
14.10-2.
Power
Switching
without
Relay
14-8
2N2907A
2N22224
PERIPHERAL
TO
BE
POWERED