MANUALS - 501 - Mechanical Assembly and Installation

3.0 MECHANICAL ASSEMBLY AND INSTALLATION

3.1 SAFETY CONSIDERATIONS

This instrument complies with required safety regulations. To prevent electrical or fire hazard and ensure safe operation, please follow the guidelines below:
VISUAL INSPECTION: Do not attempt to operate the unit if damage exits.

POWER VOLTAGE: The power supply range should be 9 - 50 V dc.

POWER WIRING: This instrument has no power-on switch; it will be in operation as soon as the power supply is energized.

SIGNAL WIRING: Make signal connections before power is applied. If connection changes are required, first deenergize the power supply.

EXERCISE CAUTION: As with any electronic instrument, high voltage may exist when attempting to install, calibrate, or remove parts of the transmitter.

Figure 3-1. Exploded View of Model 501

The low voltage requirement of the 501 enables its use with a current-loop indicator (Newport Model 508 recommended). Tapped holes on the back of the case provide for custom mounting to a flat surface; flanges on the back of the case provide for standard 8TK2 relay track mounting. For flat surface mounting, use #6 hardware. For 8TK2 relay track mounting, simply push onto track.

3.2 OPTIONAL ADAPTERS FOR MOUNTING

The following optional adaptors provide various mounting choices:

a. Adaptor plate for either front-screw-entry surface mount, or TR2/2TK relay track mount (see Figure 3-2).

b. Rail clamp for DIN-EN-50 022 relay track mount (Figure 3-3).

c. Spring retainers for external 76.4 to 88.9 mm (3 to 3.5 in) explosion-proof housing mount (see Figure 3-4).

3.3 SURFACE AND TR2/2TK RELAY TRACK MOUNTING

Figure 3-2. Bulkhead and Track Mounting
1. Position plate for desired application.
2. Use #6 hardware to mount plate to back of 501 case. 3.4 DIN EN 50 022 RELAY TRACK MOUNTING

DIN TRACK MOUNTING: SHOWN FOR HORIZONTAL TRACK

DIN TRACK MOUNTING: SHOWN FOR VERTICAL TRACK
Figure 3-3. DIN Track Mounting

1. Position plate for desired track direction.
2. Use #8 flathead screws to mount plate to back of 501 case.
3. Snap 501 case assembly onto DIN rail.

3.5 EXTERNAL EXPLOSION-PROOF HOUSING MOUNTING

Top View of Explosion-Proof Housing.
Unit and housing shown for reference only.

Figure 3-4. Spring Retainer for Explosion-Proof Housing

1. Position spring retainer across back of 501 case.
2. Use wire protector feet (4 provided with above option) to hold spring retainers in place.
3. Press 501 case assembly into explosion-proof housing.

4.0 POWER AND SIGNAL INPUT CONNECTIONS

TEST, +PWR , and -PWR screws accept 2 mm (13 gauge) or lighter wire. CASE GND is grounded to the case. Input range is 9-50 V dc.

SCREW-TERMINAL PIN ASSIGNMENT AS SHOWN IN FIGURE 4-1
1	TEST	The Test function is used to determine if the transmitter is working. Since the 501 is capable of outputting up to 30 mA, the voltmeter should be able to read a current output up to 30 mA (which is 300 mV).
2	+ POWER/OUTPUT
3	- POWER/OUTPUT
4	CASE GND
A	+EXCITATION
B	+SENSE (N/C)
C	-SENSE
D	-EXCITATION

Figure 4-1. Input Connections

Figure 4-1 illustrates three ways to perform wire hook-up. The current can be measured using the field voltmeter, a milliammeter, or a millivoltmeter shunted by a known resistor. All three are shown above.