ES-3111 Rev.6
BT
Space-saving Two-wire Signal Conditioners B-UNIT
THERMOCOUPLE TRANSMITTER
(non-isolated)
Functions & Features
• Accepting direct input from a thermocouple and providing a standard 4 – 20 mA DC signal
• Burnout protection
• High-accuracy cold junction compensation
• High-density mounting
MODEL: BT–[1][2]
ORDERING INFORMATION
• Code number: BT-[1][2]
Specify a code from below for each of [1] and [2].
(e.g. BT-2/BL/Q)
• Temperature range (e.g. 0 – 800°C)
• Specify the specification for option code /Q
(e.g. /C01/S01)
[1] INPUT THERMOCOUPLE
2
: K (CA) (Usable range -270 to +1370°C, -454 to +2498°F)
3
: E (CRC) (Usable range -270 to +1000°C, -454 to +1832°F)
4
: J (IC) (Usable range -210 to +1200°C, -346 to +2192°F)
5
: T (CC) (Usable range -270 to +400°C, -454 to +752°F)
7
: R (Usable range -50 to +1760°C, -58 to +3200°F)
8
: S (Usable range -50 to +1760°C, -58 to +3200°F)
[2] OPTIONS (multiple selections)
Burnout
blank
: Upscale burnout
/BL
: Downscale burnout
/BN
: No burnout
Other Options
blank
: none
/Q
: Option other than the above (specify the specification)
SPECIFICATIONS OF OPTION: Q (multiple selections)
COATING (For the detail, refer to our web site.)
/C01
: Silicone coating
/C02
: Polyurethane coating
/C03
: Rubber coating
TERMINAL SCREW MATERIAL
/S01
: Stainless steel
GENERAL SPECIFICATIONS
Construction
: Plug-in
Connection
: M3.5 screw terminals (torque 0.8 N·m)
Screw terminal
: Nickel-plated steel (standard) or stainless steel
Housing material
: Flame-resistant resin (black)
Zero adjustment
: -5 to +5 % (front)
Span adjustment
: 95 to 105 % (front)
Linearization
: Not provided
Cold junction compensation
: CJC sensor attached to the
input terminals
INPUT SPECIFICATIONS
Minimum span
: 3 mV
Offset
: Max. 1.5 times span
Input resistance
: 50 kΩ minimum
Burnout sensing
: 0.25 μA
Minimum span (in °C)
K (CA)
: 75°C
E (CRC)
: 50°C
J (IC)
: 60°C
T (CC)
: 75°C
R
: 360°C
S
: 380°C
Minimum span (in °F)
K (CA)
: 140°F
E (CRC)
: 90°F
J (IC):
110°F
T (CC)
: 140°F
R
: 650°F
S
: 690°F
OUTPUT SPECIFICATIONS
Output
: 4 – 20 mA DC
Load resistance vs. supply voltage:
Load Resistance (Ω) = (Supply Voltage (V) – 12 (V)) ÷ 0.02 (A) (including leadwire resistance)
INSTALLATION
Supply voltage
: 12 – 60 V DC
Operating temperature
: -5 to +60°C (23 to 140°F)
Operating humidity
: 30 to 90 %RH (non-condensing)
Mounting
: Surface or DIN rail; Standard Rack Mounting Frame BX-16H available
Weight
: 150 g (0.33 lb)
PERFORMANCE in percentage of span
Accuracy
: ±0.1 % (at over 400°C or 750°F for R and S)
Cold junction compensation error
(at 20°C or 68°F)
K, E, J & T
: ±0.5°C or ±0.9°F
S & R
: ±1°C or ±1.8°F
Temp. coefficient
: ±0.05 %/°C (±0.03 %/°F)
(at over 400°C or 750°F for R and S)
Response time
: ≤ 0.5 sec. (0 – 90 %)
Burnout response
: ≤ 10 sec.
EXTERNAL DIMENSIONS unit: mm [inch]
TERMINAL ASSIGNMENTS unit: mm [inch]
SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM