Manual Number 9018205 Revision F, April 1, 2021
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4.6 TEMPERATURE PROBE INSTALLATION
The CH93 (Type 2) supports two types of temperature probes: an RTD (Resistance Temperature
Detector; 500 Ω) and a Temperature Transducer (current sense device; AD590). This section
describes compatible probes available for installation for the CH93 Type 2 unit. Either may be used
(if only one) or one of each type.
RTD Probes
To install either of the RTD-style probes for OAT or cockpit/cabin temperature, connect to
pins 4 and 9 (no polarity required) of the mating connector of the CH93 per the instructions
below.
4.6.1.1
OAT RTD Probe
The MCIA p/n B-10-1 is a 13-inch long Outside Air Temperature RTD Probe furnished
with a 6 pin connector and mating socket connector kit. The probe mounts in a 5/16”
diameter hole through the aircraft skin. Use 22 gauge wire to create a harness that
connects the probe’s mating connector to the CH93 mating 9-pin d-sub connector
Refer below to Figure 4.14 for pinout connection to the CH93 unit. Refer to Figure 4.24.
13.0 ± 0.3
2.07
TE DEUTSCH 369
6 Pin Connector
TE DEUTSCH 369
6 Socket Connector
22 Ga Wire
Customer
Supplied
Pin 1
Pin 6
0.563 (9/16)
HEX
B-10-1 Probe
MD93
Pin
Description
Pin
Description
2
Signal
High
4
RTD Out
3
Signal Low
9
RTD
Return
4.6.1.2
Interior RTD Temperature Probe
The MCIA p/n B-11-1 is a 120-inch long (10 foot) Cockpit/Cabin Temperature RTD Probe
that mounts by either a #8 (or smaller) screw or cable tie to any interior location. To
connect the B-11-1 probe to the CH93 unit, remove excess cable length from the probe,
strip ends, and connect to the CH93 mating 9-pin d-sub connector. Refer to Figure 4.25.
0.62
120±2.0
0.73
0.58
0.33
0.16
Ø0.17
B-11-1 Probe
MD93
Wire
Description
Pin
Description
Black
RTD Pin 1
4
RTD Out
Black
RTD Pin 2
9
RTD
Return
Figure 4.24
B-10-1 Temperature Probe
Figure 4.25
B-11-1 Temperature Probe
