Crowcon Tetra User Manual

Tetra warm up sequence
a) The unit will test the
alarm LEDs, sounder,
vibration alerts, and
the operator display
screen. The sounder
may be silenced by
pressing the button.
b) The unit will continue
through a warm up sequence as shown below, this will take
approximately 45 seconds.
c) Auto zero
If auto zero is enabled (default), the unit will display the auto zero
menu. Press the operator button with a single click to confirm auto
zero. If the operator button is not pressed within the 10 second time
out, Tetra will proceed directly to Run mode without performing zero.
3
Tetra Quickstart guide
LEDs Alarm test
Vibrator Alarm test
Sounder Alarm test
Tetra
vs. 1.01
AUTO ZERO?
Click to
confirm
in 7 secs
i
CH4 %LEL CO ppm
H2S ppm
O2 %
!
CROWCON
Tetra
Gas Detection You ..
TODAY IS
Wed
14-May-2003
14:02:49
i
NEXT CAL
21-Aug-2003
i
1-2 m
AUTO ZERO?
Click to
confirm
in 7 secs
i
CH4 %LEL CO ppm
H2S ppm
O2 %
0.0
0.0
0
20.8
No auto zero
Auto zero
OK
AUTO ZERO
Auto zero in
progress
AUTO ZERO
CH4
H2S
Co
O2
AUTO ZERO
CH4
H2S
Run mode

Crowcon Tetra Specifications

General

Operating Temperature	-20°C to +50°C
Type	Portable Gas Detector
Gases Detected	Oxygen, Carbon Monoxide, Hydrogen Sulfide
Display	LCD
Ingress Protection	IP65
Sensor Types	Electrochemical