Advertisement
Table 4 - Termination - I/O Options Dedicated to the CRIR E1 (continued)
PIN NUMBER PIN FUNCTION DESCRIPTION
5
6
Alarm_OC
7
1 The specified parameter relies on the subcontractor's specification and is not tested by Honeywell.
With the ABC function on, the sensor readings, which may have drifted due to mishandling during
transportation and/or installation, may gradually be recalibrated to the correct numbers. However, in
case the user cannot wait for several cycles of ABC to run, the two quick manual calibrations given in
5.1 and 5.2 may be performed.
Tel: 07788 548013
solentgasconsultants@gmail.com
Honeywell CRIR-E1 User Guide
Digital input forcing background or zero
calibration
Background calibration: When closed for
minimum 4 s, maximum 8 s, bCAL
(background calibration) assuming 400
ppm CO
exposure.
2
bCAL_in
Zero calibration: when closed for
/CAL
minimum 16 s CAL (zero calibration)
assuming 0 ppm CO
Absolute maximum voltage range
Internal pull down to GND resistor
Input low level
Input high level
PWM output configured as digital output
used fordirect reading by customer's
microcontroller or to provide analog
output.
Normal concentration range
PWM cycle time
Beginning of each cycle
End of each cycle
PWM
Relationship between CO
(ppm) and PWM output
PWM resolution
Absolute maximum voltage range
Internal pull down to GND resistor
Output low level
Output high level
Open collector output for alarm indication
Absolute maximum voltage range
Internal pull up to G+ resistor
Maximum sink current
Saturation voltage
exposure
2
1
1
1
concentration
2
1
1
1
1
1
1
CALIBRATION
ELECTRONIC SPECIFICATION
No internal protection, pulled up to VDD2
at processor reset (power up and power
down)
GND to VDD + 0.5 V
120 k
GND to 0.75 V
2.3 V to VDD + 0.3 V
No internal protection, pulled down at pro-
cessor reset (power up and power down)
400 ppm to 2000 ppm
1004 ms ± 5%
high level output, 2 ms
low level output, 2 ms
C(CO
) = 2000 x (TH - 2) / (TH + TL - 4)
2
TH: time (ms) of high level output in a cycle
TL: time (ms) of low level output in a cycle
0.5 ms ± 4%
GND to VDD + 0.5 V
120 k
0.4 VDC maximum at 8 mA sink
2.4 VDC minimum at 8 mA source
no internal protection, pulled up to G+
at processor reset (power up and power
down)
GND to 5 V + 0.5 V
10 k
100 mA
2.3 V to Vin + 0.3 V
Advertisement
