Chapter 5: Operation; Initial Start-Up; Warm-Up Period; Figure 5-1. Sample Fault Code Display - Industrial Scientific iTrans 77023554 Manual

iTrans Fixed Point Single/Dual Gas Monitor Operation
5
Chapter
O
PERATION

5.1. Initial Start-up

Once power is applied (12-28 VDC), the is operational. The LED
display powers up, and the system enters a start-up period. During this start-up
period, the identifies the sensors that are connected and then enters a
three minute warm-up period.
NOTE: Upon initial power up, broadband infrared (BBIR) sensors do not store or
transmit the default values for Low Alarm, High Alarm, and 4-20 mA range to the
unit. These values are set to zero, and must be set following the
procedures outlined later in this manual.

5.2. Warm-up Period

During this warm-up period, the
4-20 mA outputs are limited to 3 mA
(16 mA for oxygen). After the three
minute warm-up, the unit will enter
the Normal Operating Mode. If during
the warm-up period, the unit fails a
self test, the display will show a fault
code, and the fault relay will be
activated. Fault codes are located in

Figure 5-1. Sample Fault Code Display

Table 5-1 and in Chapter 8.
NOTE: When not using 4-20 mA outputs, use the supplied resistors to connect
CH-1 and CH-2 to GND. If these resistors are not connected and the 4-20 mA
outputs are not used, a "P" will appear on the display, indicating an open loop
condition.
(P/N: 77023554) 5-1
INDUSTRIAL SCIENTIFIC