Pressure Temperature Transmitter STT700 SmartLine Digital accuracy up to 0.15 Deg C for Pt100 4-20 mA DC

 

Introduction

Part of the SmartLine® family of products, the SmartLine STT700 is a high performance temperature transmitter offering high accuracy and stability over a wide range of process and ambient temperatures. SmartLine easily meets the most demanding needs for temperature measurement applications.

 

Best in Class Features:

The STT700 is single or a dual input temperature transmitter that supports millivolt, thermocouple and RTD sensors. It is available with either HART or DE protocol output.

 

High performance

   o Digital accuracy up to 0.15 Deg C for Pt100

   o Stability up to ±0.05% of URL per year for ten years

   o 500 mSec update time (single input)

   o 1 Sec update time (dual input)

 

Reliable measurement

   o Built in galvanic isolation

   o Sensor break detection

   o Comprehensive on-board diagnostic capabilities

   o Full compliance to SIL 2/3 requirements.

   o Available with 4 year warranty o Supports Namur 89 Wire break

   o Direct entry of Callendar-van Dusen coefficients R0, α, δ and β for calibrated RTD sensors.

 

Lower Cost of Ownership

   o Universal input

   o Dual sensor option

   o External zero, span, & configuration capability

   o Polarity insensitive loop wiring

 

Communications/Output Options:

   o 4-20 mA DC

   o HART ® (version 7.0)

   o Honeywell Digitally Enhanced (DE)

   All transmitters are available with the above listed output and communications protocol option.

 

Mounting Options:

   o Direct sensor head mounting in DIN Form A aluminum housing.

   o Other mounting options available include wall, pipe, DIN Rail or single compartment field housing.

 

Instructions:

Make selections from all Tables Key through XIII using column below the proper arrow. Asterisk indicates availability. Letter (a) refer to restrictions highlighted in the restrictions table. Tables delimited w ith dashes.

Differential Temperature Measurement

SmartLine STT700 Temperature supports differential temperature measurements for dual input transmitters. When the loop current mode is set to “Differential” then the input range is from A to B for sensor 1 & 2 where

 

A = Sensor 1 Minimum – Sensor 2 Maximum

B = Sensor 1 Maximum – Sensor 2 Minimum

 

 

Digital Accuracy for differential temperature measurement

 If both input types are the same, then the digital accuracy equals 1.5 times the worst case accuracy for that input type.

 If the input types are different, then the digital accuracy equals the sum of the worst case sensor 1 and sensor 2 accuracies. For example, assume that input 1 is a J T/C and input 2 is an R T/C. Assume that the desired operating range is between 0 and +400 °C. The digital accuracy for a J T/C in this range is 0.30 °C and the digital accuracy for an R T/C in this range is 1.00 °C. Therefore, the worst case digital accuracy would be 1.30 °C.

 

Performance under Rated Conditions – All models

Stray Rejection	Common Mode AC (50 or 60 Hz): 120 dB (with maximum source impedance of 100 ohms) or ± 1 LSB (least significant bit) whichever is greater with line voltage applied. DC: 120 dB (with maximum source impedance of 50 ohms) or a ±1 LSB whichever is greater with 120 VDC applied. DC (to 1 KHz): 50 dB (with maximum source of impedance of 50 ohms) or ±1 LSB whichever is greater with 50 VAC applied. Normal Mode AC (50 or 60 Hz): 60 dB (with 100% span peak-to-peak maximum)
EMC Compliance	EN 61326-1 and EN 61326-3-1 (SIL)
Lightning Protection Option	Leakage Current: 10 uA max @ 42.4 VDC 85 °C Impulse rating: 8/20 uS        5000 A (>10 strikes)      10000 A (1 strike min.)                         10/1000 uS  200 A (> 300 strikes)

 

 

Materials Specifications – All models

Parameter	Description
Terminal Block and Module Housing	Lexan 500R (Polycarbonate, Glass Fiber Reinforced 10%)
Connection Screws	M3 Nickel Plated Brass
Weight	0.075 kg (0.2 lbs)