GMP251 Specifications - GMP251

GMP251 User Guide
Document code
M211799EN
Revision
G
Language
English (United States)
Product
GMP251
Document type
User guide
Table 1. Measurement Performance
Property Description/Value
Measurement range 0 ... 20 %CO2
Accuracy at 25 °C (77 °F) and 1013 hPa (incl. Repeatability and Non-linearity)
At 5 %CO2 ±0.1 %CO2
0 ... 8 %CO2 ±0.2 %CO2
8 ... 20 %CO2 ±0.4 %CO2
Calibration Uncertainty
At 5 %CO2 ±0.12 %CO2
At 20 %CO2 ±0.32 %CO2
Long-Term Stability
0 ... 8 %CO2 ±0.3 %CO2/year
8 ... 12 %CO2 ±0.5 %CO2/year

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 ... 1200 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
Flow Rate Dependence (for Flow-Through Model Option)

< 1 l/min flow

No effect
1 … 10 l/min flow < 0.6 % of reading/ l/min
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 model with > 0.1 l/min < 1 min
With spray shield < 2 min
Table 2. Operating Environment
Property Description/Value
Operating temperature of CO2 measurement -40 ... +60 °C (-40 ... +140 °F)
Storage temperature -40 ... +70 °C (-40 ... +158 °F)
Pressure
Compensated 500 ... 1100 hPa
Operating < 1.5 bar
Humidity 0 ... 100 %RH, non-condensing
Gas Flow (for Flow-Through Option)
Operating range < 10 l/min
Recommended range 0.1 … 0.8 l/min
Condensation prevention Sensor head heating, when power on
EMC compliance EN61326-1, Generic Environment
Chemical tolerance (temporary exposure during cleaning)
  • H2O2 (2000 ppm, non-condensing)
  • Alcohol-based cleaning agents (for example ethanol and IPA)
  • Acetone
  • Acetic acid
Table 3. 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 VDC
With voltage output in use 12 ... 30 VDC
With current output in use 20 ... 30 VDC
Power Consumption
Typical (continuous operation) 0.4 W
Maximum 0.5 W
Table 4. Mechanical Specifications
Property Description/Value
Weight, probe 45 g (1.59 oz)
Materials
Probe housing PET plastic
Filter PTFE membrane, PET plastic grid
Connector Nickel plated brass, M12 / 5 pin
IP rating, probe body IP65
Connector M12 5-pin male
Dimensions
Probe diameter 25 mm (0.98 in)
Probe length 96 mm (3.78 in)