GMP251 specifications - GMP251

GMP251 User Guide

Document code
M211799EN
Revision
H
Language
English
Product
GMP251
Document type
User guide
Table 1. GMP251 measurement performance
Property Description/value
Measurement range 0 ... 20 %CO2
Accuracy 1
At 5 %CO2 ±0.1 %CO2
At 0 ... 8 %CO2 ±0.2 %CO2
At 8 ... 20 %CO2 ±0.4 %CO2
Calibration uncertainty
At 5 %CO2 ±0.07 %CO2
At 20 %CO2 ±0.27 %CO2
Long-term stability
At 0 ... 8 %CO2 ±0.3 %CO2/year
At 8 ... 12 %CO2 ±0.5 %CO2/year

at 12 ... 20 %CO2

±1.0 %CO2/year

Temperature dependence
With compensation at 5 %CO2, 0 ... +50 °C (+32 ... +122 °F) < ±0.05 %CO2
With compensation, 0 … 20 %CO2, −40 … +60 °C (−40 ... +140 °F) ±0.045 % of reading/°C

without temperature compensation at 5 %CO2 (typical)

-0.25 % of reading/°C

Pressure dependence
With compensation at 5 %CO2 700 ... 1100 hPa ±0.05 %CO2
With compensation, 0 … 20 %CO2 500 ... 1100 hPa ±0.015 % of reading/hPa

Without compensation (typical)

+0.15 % of reading/hPa

Humidity dependence
With compensation, 0 … 20 %CO2, 0 … 100 %RH ±0.7 % of reading (at +25 °C (+77 °F))

Without compensation (typical)

+0.05 % of reading / %RH

O2 dependence
With compensation, 0 … 20 %CO2, 0 ... 90 %O2 ±0.6 % of reading (at +25 °C (+77 °F))
Without compensation (typical) -0.08 % of reading / %O2
Start-up, warm-up, and response time
Start-up time at +25 °C (+77 °F) < 10 s
Warm-up time for full spec. < 4 min
Response time (T90):

With standard filter

< 1 min

Flow-through option with > 0.1 l/min < 1 min
With spray shield < 2 min
Flow rate dependence (for flow-through option)
Flow rate dependence:

< 1 l/min flow

No effect

1 … 10 l/min flow < 0.6 % of reading/ l/min
Table 2. GMP251 operating environment
Property Description/value
Operating temperature of CO2 measurement −40 ... +60 °C (−40 ... +140 °F) 2
Storage temperature −40 ... +70 °C (−40 ... +158 °F)
Humidity 0 ... 100 %RH, non-condensing
Condensation prevention Sensor head heating, when power on
IP rating, probe body

IP65: Dust-tight. Protected from water jets from any direction.

Chemical tolerance (temporary exposure during cleaning)
  • H2O2 (2000 ppm, non-condensing)
  • Alcohol-based cleaning agents (for example ethanol and IPA)
  • Acetone
  • Acetic acid
Pressure
Compensated 500 ... 1100 hPa
Operating < 1.5 bar
Gas flow (for flow-through option)
Operating range < 10 l/min
Recommended range 0.1 … 0.8 l/min
Table 3. GMP251 inputs and outputs
Property Description/value
Analog outputs
  • 0 ... 5/10 V (scalable), min. load 10 kΩ
  • 0/4 ... 20 mA (scalable), max. load 500 Ω
Digital output Over RS-485:
  • Modbus
  • Vaisala Industrial Protocol
Operating voltage
With digital output in use 12 ... 30 V DC
With voltage output in use 12 ... 30 V DC
With current output in use 20 ... 30 V DC
Power consumption
Typical (continuous operation) 0.4 W
Maximum 0.5 W
Table 4. GMP251 mechanical specifications
Property Description/value
Weight, probe 45 g (1.59 oz)
Connector type M12 5-pin male
Materials
Probe housing PBT polymer
Filter PTFE membrane, PBT polymer grid
Connector Nickel plated brass
Dimensions
Probe diameter 25 mm (0.98 in)
Probe length 96 mm (3.78 in)
Table 5. GMP251 compliance
Property Description/Value

EU directives and regulations

EMC Directive (2014/30/EU)

RoHS Directive (2011/65/EU) amended by 2015/863

Electromagnetic compatibility (EMC)

EN 61326‑1, basic electromagnetic environment

EMC emissions

CISPR 32 / EN 55032, Class B

Compliance marks

CE, RCM
1 At 25 °C (77 °F) and 1013 hPa (incl. repeatability and non-linearity).
2 Occasional short-term exposure to up to +90 °C (+194 °F) allowed, provided that the probe is fully installed inside the measured condition and power is switched on. Accuracy specification not applicable if used in temperatures above +60 °C (+140 °F).