senva TG Series Application Note
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senva TG Series Application Note

Recommendations for field calibration of tg sensors
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Application Note
TG Field Calibration
Applies To:
Description:
O
VERVIEW
The TG series products provide you with the ability to field calibrate the sensors to help correct for this
drift. Senva recommends annual field calibration on all TG sensors in order to keep the sensors
operating properly within their intended application. For combustible and refrigerant sensors, a 6
month calibration period is recommended.
E
QUIPMENT
Contact Senva (866-660-8864) to buy calibration gas kits and shrouds which will contain all necessary
equipment for each sensor.
If using gas not provided by Senva, please ensure your calibration gas is not expired and that it meets
the below requirements for concentration (PPM or %) and you are using a 0.5 LPM regulator. It is
also recommended to calibrate using Senva's gas shrouds to ensure proper gas allocation.
Carbon Monoxide
•
100 PPM Certified
•
0.5 LPM Regulator
•
Tygon or Silicone Tubing
•
TG-CO Gas Shroud (CALSHROUD-CO)
Methane, Propane, Hydrogen
•
50% LEL Certified
•
0.5 LPM Regulator
•
Tygon or Silicone Tubing
•
TG Gas Shroud (CALSHROUD-TGUL)
Refrigerant Gases
•
1000 PPM Certified
•
0.5 LPM Regulator
•
Tygon or Silicone Tubing
•
TG Gas Shroud (CALSHROUD-TGUL)
Senva TG Series with UL
Recommendations for field calibration of TG sensors.
153-0047-0B
Nitrogen Dioxide
•
10 PPM Certified
•
0.5 LPM Stainless Steel Regulator
•
Tygon Tubing
•
TG Gas Shroud (CALSHROUD-TGUL)
Oxygen
•
20.9% Certified
•
0.5 LPM Stainless Steel Regulator
•
Tygon Tubing
•
TG Gas Shroud (CALSHROUD-TGUL)
H2S, NH3
•
25 PPM Certified
•
0.5 LPM Stainless Steel Regulator
•
Tygon Tubing
•
TG Gas Shroud (CALSHROUD-TGUL)
Copyright ©2022. All rights reserved.
1/11/2022

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Summary of Contents for senva TG Series

  • Page 1 Recommendations for field calibration of TG sensors. VERVIEW The TG series products provide you with the ability to field calibrate the sensors to help correct for this drift. Senva recommends annual field calibration on all TG sensors in order to keep the sensors operating properly within their intended application.
  • Page 2 1) Using “Menu System Procedure”, ensure SFA field is set to 100. If not, set the field to 100 now. 2) Apply the gas shroud over the sensor and turn the gas on to a flow rate of 0.5 LPM. Senva provided regulators will either be on or off, these do not require adjustment to 0.5 LPM.
  • Page 3 Figure 1: Gas shrouds secured over respective sensing elements. Left is TGUL Shroud for all other gases; Right is CO shroud for CO elements. 3) DO NOT calibrate with TG lid closed. This may cause a calibration error due to inconsistent flow rate and concentration across the sensing element.
  • Page 4 ODBUS ROCEDURE 1) If adjusting the S1 sensor’s sensitivity: a. Read the present SFA field from AV156 (BACnet) or R156 (Modbus) b. Adjust the value using the percentage calculated in the Adjustment Percentage Discovery procedure c. Write the adjust value to the SFA field at AV156 (BACnet) or R156 (Modbus) 2) If adjusting the S2 sensor’s sensitivity: a.
  • Page 5 1)  will show up on the screen, and a timer will start counting down from 180 seconds (3 minutes). • Apply the gas shroud over the sensor and turn the gas on to a flow rate of 0.5 LPM. Senva provided regulators will either be on or off, these do not require adjustment to 0.5 LPM.
  • Page 6 gas can be accomplished using the adjustment factor. Please consult factory for instruction. 2) Once completed the display will go back to its normal sequence, displaying each sensor and its concentration. d. Adjust the value using the percentage calculated in the Adjustment Percentage Discovery procedure e.
  • Page 7 ALIBRATION HECK ROCEDURE To verify sensor response or to verify calibration, choose from the following procedures. 1) For the fastest and most efficient gas usage, apply gas directly to sensor as shown in Figure 2. After 60 seconds, the device should read about 90% of the expected concentration. For 100%, continue applying gas for a total of 90 seconds.

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