Electronic Temperature Measurement

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820/821 Series Digital Temperature Indicators

  • Large 4-digit LED display
  • Field re-programmable with optional PC interface module and software
  • Software includes a security feature to prevent accidental re-programming
  • 4 mA to 20 mA programmable linearized signal output
  • Utilizes self-calibration feature for accurate and stable performance
  • Optional fully programmable switch output, relay or transistor
  • Utilizes PT100 Ω RTD Class A element for temperature sensing
  • M12 x 1 (5-pin) plug or 36” integral cable electrical connection
  • IP 65 / NEMA 4 rated environmental protection
  • All 316 Stainless Steel construction
  • Easy installation with various mounting configurations

     Note: Thermowells are recommended for pressure, corrosive fluids and high velocity applications.

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SERIES 820 Bottom connection 821 Back connection        
ACCURACY 1 ≤0.22% full scale 2 ≤0.1% full scale        
OUTPUT 1 4 mA to 20 mA            
BURNOUTS U Upscale D Downscale        
PROCESS CONNECTIONS 0 None 8 1/2" NPT Male        
2 1/4" NPT Male 48 1/2" NPT Male w/sliding compression fitting *    
TEMPERATURE RANGES -50/120 -50° to 120 °F -50/400 -50° to 400 °F 32/200 32° to 200 °F 32/400 32° to 400 °F
-50/300 -50° to 300 °F 32/120 32° to 120 °F 32/300 32° to 300 °F    
ELECTRICAL CONNECTIONS 36 Integral cable 36" 48 M12 x 1 (5-pin)    
STEM LENGTHS 025 2.5" 060 6" 120 12" 180 18"
040 4" 090 9" 150 15" 240 24"
STEM DIAMETERS 2 1/4" 3 3/8" 4 1/2" 6 6 mm

*Add 2" to stem length for this option

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SPECIFICATIONS
Temperature ranges Standard ranges from -325 °F to 1,100 °F (-200 °C to 600 °C) Customer rescalable with optional PC interface and software
Temperature sensor RTD (PT100 DIN EN 60751, Class A)
Housing material 316 Stainless Steel
Probe material 316 Stainless Steel standard
Maximum pressure 500 psig (on probe)
Power supply 9-36 Vdc, polarity protected
Supply effect 0.005%/V
Power consumption 15 mA @ 24 Vdc + output current – 950 mW max.
20 mA @ 24 Vdc for PNP output – 500 mW max.
20 mA @ 24 Vdc + sourcing current for NPN output
50 mA @ 24 Vdc for relay output – 1200 mW max.
Current output 4 mA to 20 mA (3-wire configuration) linear to temperature
Max load on current output (Vsupply-9V ) / 20 mA, Ω
Optional switching output Transistor NPN (max 100 mA source ) or
Transistor PNP (max 100 mA sink) or
Relay SPDT 0.5A @ 240 Vac
Optional switching logic N.C. or N.O. software selectable
Optional switching ranges Customer programmable between -325 °F to 1,100 °F (-200 °C to 600 °C)
Isolation 500 Vdc input /output (between probe and output signal)
Electrical connection M12 x 1 (5-pin) or integral cable
Hysteresis 1% of range standard; customer programmable optional
Accuracy ≤0.22% full scale; ≤0.1% full scale optional
Open circuit detection Upscale (22 mA) or downscale (2.5 mA) current output.
Error message on LED display
Warm-up 30 seconds
Response time 0.5 sec to 30 sec (software selectable)
Display 4-digit LED, decimal point selectable by software
Display resolution ±0.02% F.S. ±1 digit
RFI effect 1% or less typical
Temperature ranges Ambient   -40 °F to 176 °F (-40 °C to 80 °C)
Effect       <0.01% FS/ °C
Storage   -58 °F to 185 °F (-50 °C to 85 °C)
Environmental protection NEMA 4/ IP 65

Options & Accessories

Thermowells allow a temperature instrument to be removed and replaced without shutting down and draining the process, and reduce the possibility of damage to the temperature instrument.

View NOSHOK Thermowells


WARNING: This product can expose you to chemicals including Nickel, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov