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Ø1-41/64
Ø3/16 [4.76]
[23.02]
34
POWER SUPPLY (VDC)
MAX. LOAD RESISTANCE Ω
0.16 [4.1] DIA. CENTER HOLE
SERIES 651
NPT
TEMPERATURE TRANSMITTER
RTD or Thermocouple Input, Zero and Span Adjust, Linearized 4 to 20 mA Signal
FOR SENSOR WIRE ENTRY
7/32 DIA.
[5.53] MOUNTING HOLES
1-1/4
[33.32]
29/32
[23.02]
Ø1-21/32
[Ø42.07]
1200
1000
800
600
400
200
0
10 14 18 22 26 30
Temperature Transmitters
The Series 651 Temperature Transmitter is designed for use with 2 or 3 wire Pt100
RTDs or ungrounded Type K thermocouples. Thermocouple models 651TC are cold
junction compensated, automatic 32 to 160°F (0 to 70°C) with upscale burnout.
FEATURES/BENEFITS
• Various preset ranges available
• Pt100 or K type thermocouple models
• Standard temperature sensor head enclosure mounting
APPLICATIONS
• Process applications where a 4 to 20 mA signal is required
MODEL CHART
Model Input Type Range,°F (°C) Model Input Type Range,°F (°C)
651A-10
651A-20
651A-40
Pt100 RTD
Pt100 RTD
Pt100 RTD
32 to 212 (0 to 100)
32 to 392 (0 to 200)
32 to 752 (0 to 400)
651TC-01
651TC-02
651TC-04
651TC-06
Type K thermocouple
Type K thermocouple
Type K thermocouple
Type K thermocouple
32 to 212 (0 to 100)
32 to 392 (0 to 200)
32 to 752 (0 to 400)
32 to 1112 (0 to 600)
SPECIFICATIONS
Input: 2 or 3-wire Pt100 RTD (models
651A), or ungrounded Type K
thermocouple (models 651TC).
Output: 4 to 20 mA DC, linearized.
Transmitter Type: 2-wire.
Output Impedance: 700 Ω @ 24 VDC.
Power Requirements: 10 to 32 VDC,
reverse connection protected.
Accuracy: ±0.2°C plus 0.2% reading
(models 651A), ±0.1% FS plus cold
junction errors (models 651TC).
ACCESSORIES
Model Description
A-709 NEMA 4X Aluminum Transmitter Enclosure
DWYER INSTRUMENTS, INC. | dwyer-inst.com
Temperature Drift: ZERO drift typical
0.02%/°C (0.09°F); SPAN typical
0.005%/°C (0.0036°F).
Temperature Limits: Ambient: 32 to
122°F (0 to 50°C).
Maximum Storage Temperature: 160°F
(70°C).
Response Time: 10 to 90% in 200 ms
(models 651A), 70% in 2 ms (models
651TC).
Agency Approvals: CE.
149
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