Miniature Low-Cost Temperature Transmitters - Discontinued

TX91A and TX92A

Temperature Transmitters, Thermocouple Transmitter

Two-Wire Transmitter for Thermocouples and RTD's
4-20 mAdc Output
±0.1% Accuracy
Upscale Break Protection
Non-Isolated
Mountable in any Standard Protection Head
Accepts J, K, T, E Thermocouple or 100 ohm Platinum RTD Inputs

Description

TX91A and TX92A Series are discontinued. As an upgrade substitute, please check out the new TXUN temperature transmitter for details. See all TXUN Series.

The non-isolated TX90A Series transmitters convert thermocouple or RTD signals into a 4 to 20 mA dc signal output that is directly referenced to the mV input of a thermocouple or resistance of a 100 Ohm platinum RTD.

For thermocouple transmitters, the 4 to 20mA output is not linearized. T/C transmitters are available for type K, J, T, and E with color coding for each T/C type. The transmitters for RTD’s are available with the 4 to 20mA output directly proportional to the input resistance or with the 4 to 20mA output linearized to tempearature.

Note: RTD’s are slightly non-linear with the resistance diverging from actual temperature by approximately 1% at the mid point of full scale. (For linearized RTD transmitters, specify “RTD-L”. Non-linearized transmitters are the more popular choice).

The TX90A transmitters mount directly within OMEGA’s standard protection heads for connection to your sensor. OMEGA also provides complete thermocouple and RTD assemblies.

Specifications
Output Range: 4 to 20 mA dc
Zero and Span Adjustment Range: ±25% for °F and ±10% for °C
Accuracy: ±0.1% of FS (includes effects of linearity, hysteresis and repeatability) referenced to the mV input
Operating Temperature Range: -40 to 85°C (-40 to 185°F)
Storage Temperature Range: -46 to 121°C (-50 to 250°F)
Max Loop Resistance: (Vs – 8) / 0.020A
Supply Voltage: 8-50 Vdc, 24V nominal
Dimensions: 44.5 D x 31.75 mm H (1.75 x 1.25"); height includes terminal strip

Range Codes

TX91A				TX92A		Range
J	K	T	E	RTD	RTD-L
–	–	–	–	1	1-L	-40 to 60°C (-40 to 140°F)
J2	K2	T2	E2	2	2-L	-18 to 93°C (0 to 200°F)
J3	K3	T3	E3	3	3-L	-18 to 149°C (0 to 300°F)
J4	K4	T4	E4	4	4-L	-18 to 260°C (0 to 500°F)
J5	K5	T5	E5	5	5-L	-18 to 399°C (0 to 750°F)
J6	K6	–	E6	6	6-L	-18 to 538°C (0 to 1000°F)
J7	K7	T7	E7	7	7-L	0 to 100°C (32 to 212°F)
J8	K8	T8	E8	8	8-L	0 to 150°C (32 to 302°F)
J9	K9	T9	E9	9	9-L	0 to 250°C (32 to 482°F)
J10	K10	T10	E10	10	10-L	0 to 400°C (32 to 752°F)
J11	K11	–	E11	–	–	0 to 500°C (32 to 932°F)

Factory Scaling (-FS) is available for an additional charge. Please contact our engineering team for custom scaling.

† All amounts shown in AUD
Note: Range Code "T6" is not available

Part Number Builder

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Option Descriptions:

(1) Transmitter Type select from:
TX91A for Thermocouple transmitter only
TX92A for RTD transmitter only
NB1TXA for Thermocouple transmitter with Cast-Iron head and 12 inch probe
NBSTXA for Thermocouple transmitter with Aluminum head and 12 inch probe
PRTXA for RTD transmitter with Cast-Iron head and 12 inch RTD probe

(2) Input Type select from:
Nothing(leave field blank) for RTD transmitter
J for Type J thermocouple (Iron-Constantan)
K for Type K thermocouple (Chromega™-Alomega™)
T for Type T thermocouple (Copper-Constantan) (ranges 6 and 11 excluded)
E for Type E thermocouple (Chromega™-Constantan)

(3) Range for transmitter select from:
Nothing(leave field blank) for RTD probe assemblies
1 for -40 to 140°F (RTD only)
2 for 0 to 200°F
3 for 0 to 300°F
4 for 0 to 500°F
5 for 0 to 750°F
6 for 0 to 1000°F (Thermocouple J K E and RTD only)
7 for 0 to 100°C
8 for 0 to 150°C
9 for 0 to 250°C
10 for 0 to 400°C
11 for 0 to 500°C (Thermocouple J K E only)

(4) Range for RTD probe assemblies only select from:
Nothing(leave field blank) for single transmitter units
1-12 for -40 to 140°F (RTD)
2-12 for 0 to 200°F (RTD)
3-12 for 0 to 300°F (RTD)
4-12 for 0 to 500°F (RTD)
5-12 for 0 to 750°F (RTD)
6-12 for 0 to 1000°F (RTD)
7-12 for 0 to 100°C (RTD)
8-12 for 0 to 150°C (RTD)
9-12 for 0 to 250°C (RTD)
10-12 for 0 to 400°C (RTD)

(5) Linearized RTD select from:
Nothing(leave field blank) for standard non-linearized transmitter
-L for for the 4-20mA output linearized to temperature and selected range

(6) Factory Scale select from:
Nothing(leave field blank) for None
-FS for Factory Scaling. Please specify scaling data in comments section during checkout.

Note: All combinations may not be valid, check spec sheet for valid part numbers.

Product Manuals:

Download TX92A - RTD Transmitter Manual

Download TX91A - Mini Temperature Transmitter