The T121 instrument converts input signals and retransmits them into a normalized current signal for 4 - 20 mA
loop. The input signals may come from J, K, R, S, T, B, E, N thermocouples (EN 60584), RTD sensors
(thermistors) as Pt100 (EN 60751), Ni100 (DIN 43760), Pt500, Pt1000 and moreover, the instrument T121 can
acquire voltage and resistance values. TheRTD input may be with 2,3 or 4 wire connection.
GENERAL DESCRIPTION
ENGLISH - 2/8
MI001963-E
t
OUTPUT / POWER SUPPLY
voltage
Operating
Current output
Load resistance
Resolution
Output in case of over-range
Output in case of fault
Current output protection
7 – 30 V
C
Loop 4 – 20 mA
C
1 kΩ @ 26 V , 21 mA
C
(see: Load Resistance / Minimum operanting voltage Diagram)
2
μ
A (> 13 bit)
102.5% of full-scale (see Over-range table)
Programmable between 3.4 and 23 mA (see Fault table)
< 30mA
POTENTIOMETER INPUT
Potentiometer value
Energizing current
Input impedance
Sensor fault detection
Potentiometer resistance: up to 1700 Ω without exernal resistor.
375
μ
A
10 M
Ω
Yes, may be disabled
THERMOCOUPLE INPUT
Input impedance
Cold junction compensation
Sensor fault detection
10 M
Ω
- 40
–
+85
±
1.5
°
C
Yes, may be disabled
TECHNICAL SPECIFICATIONS
l
High accuracy.
l
16 bit conversion measurement.
l
Insulation 1500 V
A
.
l
Compact size and fast connections with spring terminals.
l
All parameters can be configured with dedicated software: EASY SETUP downloadable from the website
www.seneca.it in the T121 software section.
GENERAL CHARACTERISTICS
MODULE LAYOUT
44 mm
17 mm
18.5 mm
4 mm
4 mm
6 mm
25 mm
8 mm
3.75 mm
M4 x 25
Weight
35 g.
Case
Material PA6 reinforced with glass-fibre, black color.
