XTRM-2215/3215/4215 Temperature remote monitoring instrumentDetailed product description：

XTRM-2215/3215/4215 Temperature Remote Monitoring Instrument:

The XTRM temperature remote monitoring instrument adopts advanced microprocessors for intelligent control, suitable for display control of various physical quantity detection signals such as temperature, humidity, pressure, liquid level, instantaneous flow rate, speed, etc. It can patrol and detect multiple measurement signals. And it can perform high-precision linear correction on various nonlinear input signals. Intelligent digital control, range can be freely set. There are two types of control outputs: each loop alarm output/remote transmission output; The highest measurement point after multi-channel comparison is used as the output (remote transmission output). Both input and output circuits adopt optoelectronic isolation, which has good anti-interference ability. It has two types: high brightness LED digital display and pointer meter display. The whole machine adopts a wall mounted structure (length x width x height=160 x 110 x 70mm), which is very easy to install.

The XTRM-2215/3215/4215 temperature remote monitoring instrument can simultaneously measure 2 to 4 measurement points, compare the temperatures in each temperature measurement circuit, and output the highest temperature point. On site, the temperature of each point can be viewed one by one through buttons.

2、 Main technical performance:

input signal	Measurement channels 1-4 patrol measurement Analog Thermocouples: Standard Thermocouples - B, S, K, E, J, T, WRe, etc Resistance: Standard thermal resistance - Pt100, Cu50, Cu100, remote pressure resistance -30-350 Ω, etc Current: 0-10mA, 4-20mA, etc. (input resistance ≤ 250 Ω) Voltage: 0-5V, 1-5V, mV, etc. (input impedance ≥ 250K Ω)
output signal	Analog output DC 4-20mA (load resistance ≤ 500 Ω) DC 0-10mA (load resistance ≤ 750 Ω) DC 0-5V (output resistance ≤ 250 Ω) DC 1-5V (output resistance ≤ 250 Ω)
Characteristics	Measurement accuracy digital display: ± 0.2% FS word or ± 0.5% FS; pointer display: ± 2.5% FS Resolution digital display: ± 1 word Display range: -1999 to 9999; Pointer display: 0~100~150 (or special requirements) Display mode: 0.8-inch high brightness LED dual digital display, LED working status display, 1-4 measurement channel number display Channel shielding and locking function display Temperature compensation 0-50 ℃ automatic temperature compensation Parameter setting panel with touch sensitive buttons, numerical settings, parameter setting values permanently saved after power failure, password locked Protection method: Power supply under voltage, automatic reset, abnormal operation, automatic reset
Usage environment	Environmental temperature -25 ℃~80 ℃ Relative humidity ≤ 90% RH, avoid strong corrosive gases Conventional power supply voltage: AC 220V% (50Hz ± 2Hz, linear power supply) Special type · AC 90-265V (switching power supply) · DC 24V ± 2V

3、 Product Usage:
1. Oil temperature of rotary idler wheel
2. Oil temperature of the small gear oil tank
3. Temperature of the inlet and outlet bearings of the raw material mill
4. Coal dust collector ash hopper temperature
5. Coal powder box temperature
6. Main motor winding temperature of raw material mill
7. Main motor bearing temperature of raw material mill
8. Raw material exhaust fan motor stator temperature
9. High temperature fan winding temperature
10. High temperature fan bearing temperature

4、 Selection Table:

XTRM Temperature Remote Monitoring Instrument Selection Table
Model number	Type spectrum			Explanation
XTRM-	□□□□□			Multi channel intelligent inspection remote control instrument (two-wire DC24V power supply)
Number of circuits	□			1~4
display mode	１			Pointer header (discontinued)
	２			LED digital display
measurement range			ten	0～100℃
			fifteen	0～150℃

5、 Structure of the instrument


6、 Electrical connection
The wiring between the instrument and the external PT100 thermal resistor needs to be done after opening the instrument cover, and the PT100 thermal resistor should be connected. Indicating instruments, recording instruments, regulators, etc. can be connected in series with the power supply in the output circuit. The output current is proportional to the temperature change, but independent of the power supply change. The application principle is shown in the following figure:

The measurement signal of the self heating resistance sensor is amplified by a preamplifier, and then selected by a comparison input circuit (selecting a high temperature signal) or a point selection input circuit. The signal is converted into a 4-20A constant current output by a voltage/current (V/I) conversion unit. The schematic block diagram is shown in the following figure:

7、 Instrument usage instructions
After starting up, it is necessary to preheat for 10 minutes. The installation of the instrument should be as close to the measuring point as possible, so as to fully utilize the following advantages of the two-wire system:
1. High anti-interference ability, as the signal is transmitted at high levels to suppress noise and interference.
2. Simple wiring, that is, instruments can be connected from the on-site control room using twisted pair wires, reducing the cost of wiring.
When using a thermal resistor for input, in order to avoid measurement errors, the lead resistance of the sensor must ensure a certain value. Here, for each Pt100 sensor, the lead resistance is fixed at 0.35 Ω, and the corresponding wire cross-section and length are as follows:

	Wire length:	Cross sectional area:
or	2×15m	1.5mm	two
	2×10m	1.0mm	two

Any cross-sectional area of the wire can also be taken, but the total resistance of the lead must be ensured to be 0.35 Ω. Otherwise, there will be lead errors, for example, every 0.38 Ω change in lead resistance will cause a temperature error of 1 ℃. When using a thermocouple for input, the connection between the input end and the thermocouple must be made using corresponding compensation wires, and the lead wires at the input end need to consider shielding against external magnetic fields.
The size of the instrument load resistance RL depends on the display mode of the instrument, the power supply voltage, the size of the power supply ripple VR, and whether input-output isolation is used.
For pointer display instruments, the formula is as follows:

RLmax=	VS－（0.5VR+8.5）	(Ω)
	zero point zero two

For LED digital display instruments, the formula is as follows:

RLmax=	VS－（0.5VR+12）	(Ω)
	zero point zero two

For LED digital display instruments (isolated type), the formula is as follows:

RLmax=	VS－（0.5VR+15）	(Ω)
	zero point zero two

If VS=24VVR=2VPP, then RL=725 Ω (pointer meter) RL=550 Ω (LED digital display meter) RL=400 Ω (isolated LED digital display meter).
3. For circuits that are not currently in use, the input terminal should be connected to a resistor less than 100 Ω or the input wire should be short circuited. If the input is open, the instrument cannot function properly.
4. Under normal working conditions, the instrument measures four temperature channels simultaneously, but only displays and outputs the signal with the highest temperature.