Overview

The RTD input isolation safety barrier can convert the two wire or three wire thermistor (RTD) signals in hazardous areas into 4-20mA current signals and output them to the safety zone. It can be intelligently configured, and the actual range of the thermal resistance can be set through computer software. It has the functions of wire breakage alarm and out of range alarm.

"*" represents the input type of the thermistor, and the specific model is represented by a code (see "Input Signal Type and Range Table" for details).

Input signal types and measurement range

Example: when the input are 2 inputs with K-couple, temperature range is 0~1200℃, 2 outputs 4~20mA, power supply 20~35VDC, then the model should be PHD-22TT-1111 (0~1200℃).

The measuring range can be set to the specified 0~1200℃ range by computer.

* Bus terminal power supply, please see appendix for details.

Specification

Input in harzadous area
Input signal	Two wire or three wire thermistor signals (see "Input Signal Type and Range Table" for details)
Input disconnection	The default "low alarm" can be modified to "high alarm" through configuration software
Signal range	Corresponding measurement range of thermal resistance
Measurement range	Users make their own configuration when ordering, and indicate it at the tail number or otherwise.
Safety side output:
Output signal	4~20mA
Output load capacity	0~500Ω(customizable) Optional voltage output type, load resistance RL ≥ 330kΩ
LED indicator	Green: Power indicator Low range alarm yellow light on, high range alarm red light on
Output accuracy	Please refer to the "Input Signal Type and Range Table" for details
Response time	Reaching 90% of the final value within 300ms
Temperature drift	0.005%F.S/℃
Temperature parameters	Working temperature: -20℃~+60℃, storage temperature:-40℃~+80℃
Relative humidity	10%~95% RH no condensation
Dielectric strength	Between intrinsically safe side and non-intrinsically safe side (≥ 3000VAC/min); between power supply and non-intrinsically safe terminal (≥ 1500VAC/min)
Insulation resistance	≥100MΩ (between input/output/power supply)
Electromagnetic compatibility	According to IEC 61326-1(GB/T 18268), IEC 61326-3-1
MTBF	100000h
Wire requirements	Horizontal cutting surface ≥ 0.5mm2; Insulation strength ≥ 500V
Applicable field equipments	Two wire or three wire thermistors G53, Cu50, Pt100, Pt1000, Ni1000
Installation place	Installed in a safe zone, it can be connected to intrinsic safety instruments in hazardous areas up to Zone 0, IIC, Zone 20, and IIIC
Intrinsically safe certification
Functional safety certification	SIL3 according to IEC 61508 standards
Explosion proof mark	[Ex ia Ga]lIC [Ex ia Da]lllC
Explosion-proof standard	GB/T3836.1-2021  GB/T3836.4-2021
Terminals 3-2、4-2	Um:250V AC/DC Uo=8.4V DC lo=31mA Po=65.1mW Co=4.8μF Lo=20mH
Certification body	CQST(China National Quality Supervision and Test Centre for Explosion Protected Electrical Products)

Schematic diagram

Terminal assignments and dimensions

Terminal	Terminal assignments
9	Power supply +	20～35VDC
10	Power supply -
	2-wire	3-wire
2	with 4 short connected	Input-
3	Input+	Input+
4	Input-	Input-
5	Output+	4～20mA
6	Output-